Merge remote-tracking branch 'newpipe/dev' into rebase

app/src/main/java/org/schabi/newpipe/fragments/BackPressable.java

@@ -1,11 +1,11 @@
 package org.schabi.newpipe.fragments;
 
 /**
- * Indicates that the current fragment can handle back presses
+ * Indicates that the current fragment can handle back presses.
  */
 public interface BackPressable {
     /**
-     * A back press was delegated to this fragment
+     * A back press was delegated to this fragment.
      *
      * @return if the back press was handled
      */

app/src/main/java/org/schabi/newpipe/fragments/BaseStateFragment.java

@@ -1,9 +1,8 @@
 package org.schabi.newpipe.fragments;
 
+import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
-import androidx.annotation.Nullable;
-import androidx.annotation.StringRes;
 import android.util.Log;
 import android.view.View;
 import android.widget.Button;
@@ -11,6 +10,9 @@ import android.widget.ProgressBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+
 import com.jakewharton.rxbinding2.view.RxView;
 
 import org.schabi.newpipe.BaseFragment;
@@ -36,22 +38,21 @@ import io.reactivex.android.schedulers.AndroidSchedulers;
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
 public abstract class BaseStateFragment<I> extends BaseFragment implements ViewContract<I> {
-
     @State
     protected AtomicBoolean wasLoading = new AtomicBoolean();
     protected AtomicBoolean isLoading = new AtomicBoolean();
 
     @Nullable
-    protected View emptyStateView;
+    private View emptyStateView;
     @Nullable
-    protected ProgressBar loadingProgressBar;
+    private ProgressBar loadingProgressBar;
 
     protected View errorPanelRoot;
-    protected Button errorButtonRetry;
-    protected TextView errorTextView;
+    private Button errorButtonRetry;
+    private TextView errorTextView;
 
     @Override
-    public void onViewCreated(View rootView, Bundle savedInstanceState) {
+    public void onViewCreated(final View rootView, final Bundle savedInstanceState) {
         super.onViewCreated(rootView, savedInstanceState);
         doInitialLoadLogic();
     }
@@ -62,14 +63,12 @@ public abstract class BaseStateFragment<I> extends BaseFragment implements ViewC
         wasLoading.set(isLoading.get());
     }
 
-
     /*//////////////////////////////////////////////////////////////////////////
     // Init
     //////////////////////////////////////////////////////////////////////////*/
 
-
     @Override
-    protected void initViews(View rootView, Bundle savedInstanceState) {
+    protected void initViews(final View rootView, final Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
 
         emptyStateView = rootView.findViewById(R.id.empty_state_view);
@@ -105,8 +104,10 @@ public abstract class BaseStateFragment<I> extends BaseFragment implements ViewC
         startLoading(true);
     }
 
-    protected void startLoading(boolean forceLoad) {
-        if (DEBUG) Log.d(TAG, "startLoading() called with: forceLoad = [" + forceLoad + "]");
+    protected void startLoading(final boolean forceLoad) {
+        if (DEBUG) {
+            Log.d(TAG, "startLoading() called with: forceLoad = [" + forceLoad + "]");
+        }
         showLoading();
         isLoading.set(true);
     }
@@ -117,42 +118,62 @@ public abstract class BaseStateFragment<I> extends BaseFragment implements ViewC
 
     @Override
     public void showLoading() {
-        if (emptyStateView != null) animateView(emptyStateView, false, 150);
-        if (loadingProgressBar != null) animateView(loadingProgressBar, true, 400);
+        if (emptyStateView != null) {
+            animateView(emptyStateView, false, 150);
+        }
+        if (loadingProgressBar != null) {
+            animateView(loadingProgressBar, true, 400);
+        }
         animateView(errorPanelRoot, false, 150);
     }
 
     @Override
     public void hideLoading() {
-        if (emptyStateView != null) animateView(emptyStateView, false, 150);
-        if (loadingProgressBar != null) animateView(loadingProgressBar, false, 0);
+        if (emptyStateView != null) {
+            animateView(emptyStateView, false, 150);
+        }
+        if (loadingProgressBar != null) {
+            animateView(loadingProgressBar, false, 0);
+        }
         animateView(errorPanelRoot, false, 150);
     }
 
     @Override
     public void showEmptyState() {
         isLoading.set(false);
-        if (emptyStateView != null) animateView(emptyStateView, true, 200);
-        if (loadingProgressBar != null) animateView(loadingProgressBar, false, 0);
+        if (emptyStateView != null) {
+            animateView(emptyStateView, true, 200);
+        }
+        if (loadingProgressBar != null) {
+            animateView(loadingProgressBar, false, 0);
+        }
         animateView(errorPanelRoot, false, 150);
     }
 
     @Override
-    public void showError(String message, boolean showRetryButton) {
-        if (DEBUG) Log.d(TAG, "showError() called with: message = [" + message + "], showRetryButton = [" + showRetryButton + "]");
+    public void showError(final String message, final boolean showRetryButton) {
+        if (DEBUG) {
+            Log.d(TAG, "showError() called with: "
+                    + "message = [" + message + "], showRetryButton = [" + showRetryButton + "]");
+        }
         isLoading.set(false);
         InfoCache.getInstance().clearCache();
         hideLoading();
 
         errorTextView.setText(message);
-        if (showRetryButton) animateView(errorButtonRetry, true, 600);
-        else animateView(errorButtonRetry, false, 0);
+        if (showRetryButton) {
+            animateView(errorButtonRetry, true, 600);
+        } else {
+            animateView(errorButtonRetry, false, 0);
+        }
         animateView(errorPanelRoot, true, 300);
     }
 
     @Override
-    public void handleResult(I result) {
-        if (DEBUG) Log.d(TAG, "handleResult() called with: result = [" + result + "]");
+    public void handleResult(final I result) {
+        if (DEBUG) {
+            Log.d(TAG, "handleResult() called with: result = [" + result + "]");
+        }
         hideLoading();
     }
 
@@ -161,21 +182,28 @@ public abstract class BaseStateFragment<I> extends BaseFragment implements ViewC
     //////////////////////////////////////////////////////////////////////////*/
 
     /**
-     * Default implementation handles some general exceptions
+     * Default implementation handles some general exceptions.
      *
-     * @return if the exception was handled
+     * @param exception The exception that should be handled
+     * @return If the exception was handled
      */
-    protected boolean onError(Throwable exception) {
-        if (DEBUG) Log.d(TAG, "onError() called with: exception = [" + exception + "]");
+    protected boolean onError(final Throwable exception) {
+        if (DEBUG) {
+            Log.d(TAG, "onError() called with: exception = [" + exception + "]");
+        }
         isLoading.set(false);
 
         if (isDetached() || isRemoving()) {
-            if (DEBUG) Log.w(TAG, "onError() is detached or removing = [" + exception + "]");
+            if (DEBUG) {
+                Log.w(TAG, "onError() is detached or removing = [" + exception + "]");
+            }
             return true;
         }
 
         if (ExtractorHelper.isInterruptedCaused(exception)) {
-            if (DEBUG) Log.w(TAG, "onError() isInterruptedCaused! = [" + exception + "]");
+            if (DEBUG) {
+                Log.w(TAG, "onError() isInterruptedCaused! = [" + exception + "]");
+            }
             return true;
         }
 
@@ -193,8 +221,10 @@ public abstract class BaseStateFragment<I> extends BaseFragment implements ViewC
         return false;
     }
 
-    public void onReCaptchaException(ReCaptchaException exception) {
-        if (DEBUG) Log.d(TAG, "onReCaptchaException() called");
+    public void onReCaptchaException(final ReCaptchaException exception) {
+        if (DEBUG) {
+            Log.d(TAG, "onReCaptchaException() called");
+        }
         Toast.makeText(activity, R.string.recaptcha_request_toast, Toast.LENGTH_LONG).show();
         // Starting ReCaptcha Challenge Activity
         Intent intent = new Intent(activity, ReCaptchaActivity.class);
@@ -204,33 +234,58 @@ public abstract class BaseStateFragment<I> extends BaseFragment implements ViewC
         showError(getString(R.string.recaptcha_request_toast), false);
     }
 
-    public void onUnrecoverableError(Throwable exception, UserAction userAction, String serviceName, String request, @StringRes int errorId) {
-        onUnrecoverableError(Collections.singletonList(exception), userAction, serviceName, request, errorId);
+    public void onUnrecoverableError(final Throwable exception, final UserAction userAction,
+                                     final String serviceName, final String request,
+                                     @StringRes final int errorId) {
+        onUnrecoverableError(Collections.singletonList(exception), userAction, serviceName,
+                request, errorId);
     }
 
-    public void onUnrecoverableError(List<Throwable> exception, UserAction userAction, String serviceName, String request, @StringRes int errorId) {
-        if (DEBUG) Log.d(TAG, "onUnrecoverableError() called with: exception = [" + exception + "]");
+    public void onUnrecoverableError(final List<Throwable> exception, final UserAction userAction,
+                                     final String serviceName, final String request,
+                                     @StringRes final int errorId) {
+        if (DEBUG) {
+            Log.d(TAG, "onUnrecoverableError() called with: exception = [" + exception + "]");
+        }
 
-        if (serviceName == null) serviceName = "none";
-        if (request == null) request = "none";
-
-        ErrorActivity.reportError(getContext(), exception, MainActivity.class, null, ErrorActivity.ErrorInfo.make(userAction, serviceName, request, errorId));
+        ErrorActivity.reportError(getContext(), exception, MainActivity.class, null,
+                ErrorActivity.ErrorInfo.make(userAction, serviceName == null ? "none" : serviceName,
+                        request == null ? "none" : request, errorId));
     }
 
-    public void showSnackBarError(Throwable exception, UserAction userAction, String serviceName, String request, @StringRes int errorId) {
-        showSnackBarError(Collections.singletonList(exception), userAction, serviceName, request, errorId);
+    public void showSnackBarError(final Throwable exception, final UserAction userAction,
+                                  final String serviceName, final String request,
+                                  @StringRes final int errorId) {
+        showSnackBarError(Collections.singletonList(exception), userAction, serviceName, request,
+                errorId);
     }
 
     /**
-     * Show a SnackBar and only call ErrorActivity#reportError IF we a find a valid view (otherwise the error screen appears)
+     * Show a SnackBar and only call
+     * {@link ErrorActivity#reportError(Context, List, Class, View, ErrorActivity.ErrorInfo)}
+     * IF we a find a valid view (otherwise the error screen appears).
+     *
+     * @param exception List of the exceptions to show
+     * @param userAction The user action that caused the exception
+     * @param serviceName The service where the exception happened
+     * @param request The page that was requested
+     * @param errorId The ID of the error
      */
-    public void showSnackBarError(List<Throwable> exception, UserAction userAction, String serviceName, String request, @StringRes int errorId) {
+    public void showSnackBarError(final List<Throwable> exception, final UserAction userAction,
+                                  final String serviceName, final String request,
+                                  @StringRes final int errorId) {
         if (DEBUG) {
-            Log.d(TAG, "showSnackBarError() called with: exception = [" + exception + "], userAction = [" + userAction + "], request = [" + request + "], errorId = [" + errorId + "]");
+            Log.d(TAG, "showSnackBarError() called with: "
+                    + "exception = [" + exception + "], userAction = [" + userAction + "], "
+                    + "request = [" + request + "], errorId = [" + errorId + "]");
         }
         View rootView = activity != null ? activity.findViewById(android.R.id.content) : null;
-        if (rootView == null && getView() != null) rootView = getView();
-        if (rootView == null) return;
+        if (rootView == null && getView() != null) {
+            rootView = getView();
+        }
+        if (rootView == null) {
+            return;
+        }
 
         ErrorActivity.reportError(getContext(), exception, MainActivity.class, rootView,
                 ErrorActivity.ErrorInfo.make(userAction, serviceName, request, errorId));

app/src/main/java/org/schabi/newpipe/fragments/BlankFragment.java

@@ -1,24 +1,26 @@
 package org.schabi.newpipe.fragments;
 
 import android.os.Bundle;
-import androidx.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.Nullable;
+
 import org.schabi.newpipe.BaseFragment;
 import org.schabi.newpipe.R;
 
 public class BlankFragment extends BaseFragment {
     @Nullable
     @Override
-    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(final LayoutInflater inflater, @Nullable final ViewGroup container,
+                             final Bundle savedInstanceState) {
         setTitle("NewPipe");
         return inflater.inflate(R.layout.fragment_blank, container, false);
     }
 
     @Override
-    public void setUserVisibleHint(boolean isVisibleToUser) {
+    public void setUserVisibleHint(final boolean isVisibleToUser) {
         super.setUserVisibleHint(isVisibleToUser);
         setTitle("NewPipe");
         // leave this inline. Will make it harder for copy cats.

app/src/main/java/org/schabi/newpipe/fragments/EmptyFragment.java

@@ -1,17 +1,19 @@
 package org.schabi.newpipe.fragments;
 
 import android.os.Bundle;
-import androidx.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.Nullable;
+
 import org.schabi.newpipe.BaseFragment;
 import org.schabi.newpipe.R;
 
 public class EmptyFragment extends BaseFragment {
     @Override
-    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(final LayoutInflater inflater, @Nullable final ViewGroup container,
+                             final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_empty, container, false);
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java

@@ -50,14 +50,15 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
+    public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setHasOptionsMenu(true);
 
         tabsManager = TabsManager.getManager(activity);
         tabsManager.setSavedTabsListener(() -> {
             if (DEBUG) {
-                Log.d(TAG, "TabsManager.SavedTabsChangeListener: onTabsChanged called, isResumed = " + isResumed());
+                Log.d(TAG, "TabsManager.SavedTabsChangeListener: "
+                        + "onTabsChanged called, isResumed = " + isResumed());
             }
             if (isResumed()) {
                 setupTabs();
@@ -68,12 +69,14 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
     }
 
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+    public View onCreateView(@NonNull final LayoutInflater inflater,
+                             @Nullable final ViewGroup container,
+                             @Nullable final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_main, container, false);
     }
 
     @Override
-    protected void initViews(View rootView, Bundle savedInstanceState) {
+    protected void initViews(final View rootView, final Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
 
         tabLayout = rootView.findViewById(R.id.main_tab_layout);
@@ -89,14 +92,18 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
     public void onResume() {
         super.onResume();
 
-        if (hasTabsChanged) setupTabs();
+        if (hasTabsChanged) {
+            setupTabs();
+        }
     }
 
     @Override
     public void onDestroy() {
         super.onDestroy();
         tabsManager.unsetSavedTabsListener();
-        if (viewPager != null) viewPager.setAdapter(null);
+        if (viewPager != null) {
+            viewPager.setAdapter(null);
+        }
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -104,9 +111,12 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);
-        if (DEBUG) Log.d(TAG, "onCreateOptionsMenu() called with: menu = [" + menu + "], inflater = [" + inflater + "]");
+        if (DEBUG) {
+            Log.d(TAG, "onCreateOptionsMenu() called with: "
+                    + "menu = [" + menu + "], inflater = [" + inflater + "]");
+        }
         inflater.inflate(R.menu.main_fragment_menu, menu);
 
         ActionBar supportActionBar = activity.getSupportActionBar();
@@ -116,7 +126,7 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
     }
 
     @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
+    public boolean onOptionsItemSelected(final MenuItem item) {
         switch (item.getItemId()) {
             case R.id.action_search:
                 try {
@@ -141,7 +151,8 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
         tabsList.addAll(tabsManager.getTabs());
 
         if (pagerAdapter == null || !pagerAdapter.sameTabs(tabsList)) {
-            pagerAdapter = new SelectedTabsPagerAdapter(requireContext(), getChildFragmentManager(), tabsList);
+            pagerAdapter = new SelectedTabsPagerAdapter(requireContext(),
+                    getChildFragmentManager(), tabsList);
         }
 
         viewPager.setAdapter(null);
@@ -165,31 +176,37 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
         }
     }
 
-    private void updateTitleForTab(int tabPosition) {
+    private void updateTitleForTab(final int tabPosition) {
         setTitle(tabsList.get(tabPosition).getTabName(requireContext()));
     }
 
     @Override
-    public void onTabSelected(TabLayout.Tab selectedTab) {
-        if (DEBUG) Log.d(TAG, "onTabSelected() called with: selectedTab = [" + selectedTab + "]");
+    public void onTabSelected(final TabLayout.Tab selectedTab) {
+        if (DEBUG) {
+            Log.d(TAG, "onTabSelected() called with: selectedTab = [" + selectedTab + "]");
+        }
         updateTitleForTab(selectedTab.getPosition());
     }
 
     @Override
-    public void onTabUnselected(TabLayout.Tab tab) {
-    }
+    public void onTabUnselected(final TabLayout.Tab tab) { }
 
     @Override
-    public void onTabReselected(TabLayout.Tab tab) {
-        if (DEBUG) Log.d(TAG, "onTabReselected() called with: tab = [" + tab + "]");
+    public void onTabReselected(final TabLayout.Tab tab) {
+        if (DEBUG) {
+            Log.d(TAG, "onTabReselected() called with: tab = [" + tab + "]");
+        }
         updateTitleForTab(tab.getPosition());
     }
 
-    private static class SelectedTabsPagerAdapter extends FragmentStatePagerAdapterMenuWorkaround {
+    private static final class SelectedTabsPagerAdapter
+            extends FragmentStatePagerAdapterMenuWorkaround {
         private final Context context;
         private final List<Tab> internalTabsList;
 
-        private SelectedTabsPagerAdapter(Context context, FragmentManager fragmentManager, List<Tab> tabsList) {
+        private SelectedTabsPagerAdapter(final Context context,
+                                         final FragmentManager fragmentManager,
+                                         final List<Tab> tabsList) {
             super(fragmentManager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
             this.context = context;
             this.internalTabsList = new ArrayList<>(tabsList);
@@ -197,7 +214,7 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
 
         @NonNull
         @Override
-        public Fragment getItem(int position) {
+        public Fragment getItem(final int position) {
             final Tab tab = internalTabsList.get(position);
 
             Throwable throwable = null;
@@ -209,8 +226,8 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
             }
 
             if (throwable != null) {
-                ErrorActivity.reportError(context, throwable, null, null,
-                        ErrorActivity.ErrorInfo.make(UserAction.UI_ERROR, "none", "", R.string.app_ui_crash));
+                ErrorActivity.reportError(context, throwable, null, null, ErrorActivity.ErrorInfo
+                        .make(UserAction.UI_ERROR, "none", "", R.string.app_ui_crash));
                 return new BlankFragment();
             }
 
@@ -222,7 +239,7 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
         }
 
         @Override
-        public int getItemPosition(Object object) {
+        public int getItemPosition(final Object object) {
             // Causes adapter to reload all Fragments when
             // notifyDataSetChanged is called
             return POSITION_NONE;
@@ -233,7 +250,7 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
             return internalTabsList.size();
         }
 
-        public boolean sameTabs(List<Tab> tabsToCompare) {
+        public boolean sameTabs(final List<Tab> tabsToCompare) {
             return internalTabsList.equals(tabsToCompare);
         }
     }

app/src/main/java/org/schabi/newpipe/fragments/OnScrollBelowItemsListener.java

@@ -9,12 +9,13 @@ import androidx.recyclerview.widget.StaggeredGridLayoutManager;
  * if the view is scrolled below the last item.
  */
 public abstract class OnScrollBelowItemsListener extends RecyclerView.OnScrollListener {
-
     @Override
-    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+    public void onScrolled(final RecyclerView recyclerView, final int dx, final int dy) {
         super.onScrolled(recyclerView, dx, dy);
         if (dy > 0) {
-            int pastVisibleItems = 0, visibleItemCount, totalItemCount;
+            int pastVisibleItems = 0;
+            int visibleItemCount;
+            int totalItemCount;
             RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
 
             visibleItemCount = layoutManager.getChildCount();
@@ -22,10 +23,14 @@ public abstract class OnScrollBelowItemsListener extends RecyclerView.OnScrollLi
 
             // Already covers the GridLayoutManager case
             if (layoutManager instanceof LinearLayoutManager) {
-                pastVisibleItems = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
+                pastVisibleItems = ((LinearLayoutManager) layoutManager)
+                        .findFirstVisibleItemPosition();
             } else if (layoutManager instanceof StaggeredGridLayoutManager) {
-                int[] positions = ((StaggeredGridLayoutManager) layoutManager).findFirstVisibleItemPositions(null);
-                if (positions != null && positions.length > 0) pastVisibleItems = positions[0];
+                int[] positions = ((StaggeredGridLayoutManager) layoutManager)
+                        .findFirstVisibleItemPositions(null);
+                if (positions != null && positions.length > 0) {
+                    pastVisibleItems = positions[0];
+                }
             }
 
             if ((visibleItemCount + pastVisibleItems) >= totalItemCount) {

app/src/main/java/org/schabi/newpipe/fragments/ViewContract.java

@@ -2,8 +2,11 @@ package org.schabi.newpipe.fragments;
 
 public interface ViewContract<I> {
     void showLoading();
+
     void hideLoading();
+
     void showEmptyState();
+
     void showError(String message, boolean showRetryButton);
 
     void handleResult(I result);

app/src/main/java/org/schabi/newpipe/fragments/detail/StackItem.java

@@ -4,19 +4,15 @@ import java.io.Serializable;
 
 class StackItem implements Serializable {
     private final int serviceId;
-    private String title;
     private final String url;
+    private String title;
 
-    StackItem(int serviceId, String url, String title) {
+    StackItem(final int serviceId, final String url, final String title) {
         this.serviceId = serviceId;
         this.url = url;
         this.title = title;
     }
 
-    public void setTitle(String title) {
-        this.title = title;
-    }
-
     public int getServiceId() {
         return serviceId;
     }
@@ -25,6 +21,10 @@ class StackItem implements Serializable {
         return title;
     }
 
+    public void setTitle(final String title) {
+        this.title = title;
+    }
+
     public String getUrl() {
         return url;
     }

app/src/main/java/org/schabi/newpipe/fragments/detail/TabAdaptor.java

@@ -1,27 +1,27 @@
 package org.schabi.newpipe.fragments.detail;
 
+import android.view.ViewGroup;
+
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentPagerAdapter;
-import android.view.ViewGroup;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public class TabAdaptor extends FragmentPagerAdapter {
-
     private final List<Fragment> mFragmentList = new ArrayList<>();
     private final List<String> mFragmentTitleList = new ArrayList<>();
     private final FragmentManager fragmentManager;
 
-    public TabAdaptor(FragmentManager fm) {
+    public TabAdaptor(final FragmentManager fm) {
         super(fm);
         this.fragmentManager = fm;
     }
 
     @Override
-    public Fragment getItem(int position) {
+    public Fragment getItem(final int position) {
         return mFragmentList.get(position);
     }
 
@@ -30,7 +30,7 @@ public class TabAdaptor extends FragmentPagerAdapter {
         return mFragmentList.size();
     }
 
-    public void addFragment(Fragment fragment, String title) {
+    public void addFragment(final Fragment fragment, final String title) {
         mFragmentList.add(fragment);
         mFragmentTitleList.add(title);
     }
@@ -40,46 +40,49 @@ public class TabAdaptor extends FragmentPagerAdapter {
         mFragmentTitleList.clear();
     }
 
-    public void removeItem(int position){
+    public void removeItem(final int position) {
         mFragmentList.remove(position == 0 ? 0 : position - 1);
         mFragmentTitleList.remove(position == 0 ? 0 : position - 1);
     }
 
-    public void updateItem(int position, Fragment fragment){
+    public void updateItem(final int position, final Fragment fragment) {
         mFragmentList.set(position, fragment);
     }
 
-    public void updateItem(String title, Fragment fragment){
+    public void updateItem(final String title, final Fragment fragment) {
         int index = mFragmentTitleList.indexOf(title);
-        if(index != -1){
+        if (index != -1) {
             updateItem(index, fragment);
         }
     }
 
     @Override
-    public int getItemPosition(Object object) {
-        if (mFragmentList.contains(object)) return mFragmentList.indexOf(object);
-        else return POSITION_NONE;
+    public int getItemPosition(final Object object) {
+        if (mFragmentList.contains(object)) {
+            return mFragmentList.indexOf(object);
+        } else {
+            return POSITION_NONE;
+        }
     }
 
-    public int getItemPositionByTitle(String title) {
+    public int getItemPositionByTitle(final String title) {
         return mFragmentTitleList.indexOf(title);
     }
 
     @Nullable
-    public String getItemTitle(int position) {
+    public String getItemTitle(final int position) {
         if (position < 0 || position >= mFragmentTitleList.size()) {
             return null;
         }
         return mFragmentTitleList.get(position);
     }
 
-    public void notifyDataSetUpdate(){
+    public void notifyDataSetUpdate() {
         notifyDataSetChanged();
     }
 
     @Override
-    public void destroyItem(ViewGroup container, int position, Object object) {
+    public void destroyItem(final ViewGroup container, final int position, final Object object) {
         fragmentManager.beginTransaction().remove((Fragment) object).commitNowAllowingStateLoss();
     }
 

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -8,16 +8,6 @@ import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
-import androidx.annotation.DrawableRes;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import com.google.android.material.appbar.AppBarLayout;
-import com.google.android.material.tabs.TabLayout;
-import androidx.fragment.app.Fragment;
-import androidx.core.content.ContextCompat;
-import androidx.viewpager.widget.ViewPager;
-import androidx.appcompat.app.ActionBar;
-import androidx.appcompat.app.AppCompatActivity;
 import android.text.Html;
 import android.text.Spanned;
 import android.text.TextUtils;
@@ -41,6 +31,17 @@ import android.widget.Spinner;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.DrawableRes;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+import androidx.fragment.app.Fragment;
+import androidx.viewpager.widget.ViewPager;
+
+import com.google.android.material.appbar.AppBarLayout;
+import com.google.android.material.tabs.TabLayout;
 import com.nostra13.universalimageloader.core.assist.FailReason;
 import com.nostra13.universalimageloader.core.listener.ImageLoadingListener;
 import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener;
@@ -52,7 +53,6 @@ import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.ServiceList;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
-import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.stream.AudioStream;
 import org.schabi.newpipe.extractor.stream.Description;
@@ -106,12 +106,9 @@ import io.reactivex.schedulers.Schedulers;
 import static org.schabi.newpipe.extractor.StreamingService.ServiceInfo.MediaCapability.COMMENTS;
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
-public class VideoDetailFragment
-        extends BaseStateFragment<StreamInfo>
-        implements BackPressable,
-        SharedPreferences.OnSharedPreferenceChangeListener,
-        View.OnClickListener,
-        View.OnLongClickListener {
+public class VideoDetailFragment extends BaseStateFragment<StreamInfo>
+        implements BackPressable, SharedPreferences.OnSharedPreferenceChangeListener,
+        View.OnClickListener, View.OnLongClickListener {
     public static final String AUTO_PLAY = "auto_play";
 
     private int updateFlags = 0;
@@ -184,32 +181,41 @@ public class VideoDetailFragment
     private ImageView thumbsDownImageView;
     private TextView thumbsDisabledTextView;
 
-    private static final String COMMENTS_TAB_TAG = "COMMENTS";
-    private static final String RELATED_TAB_TAG = "NEXT VIDEO";
-    private static final String EMPTY_TAB_TAG = "EMPTY TAB";
-
     private AppBarLayout appBarLayout;
-    private  ViewPager viewPager;
+    private ViewPager viewPager;
     private TabAdaptor pageAdapter;
     private TabLayout tabLayout;
     private FrameLayout relatedStreamsLayout;
 
-
     /*////////////////////////////////////////////////////////////////////////*/
 
-    public static VideoDetailFragment getInstance(int serviceId, String videoUrl, String name) {
+    private static final String COMMENTS_TAB_TAG = "COMMENTS";
+    private static final String RELATED_TAB_TAG = "NEXT VIDEO";
+    private static final String EMPTY_TAB_TAG = "EMPTY TAB";
+
+    private static final String INFO_KEY = "info_key";
+    private static final String STACK_KEY = "stack_key";
+
+    /**
+     * Stack that contains the "navigation history".<br>
+     * The peek is the current video.
+     */
+    private final LinkedList<StackItem> stack = new LinkedList<>();
+
+    public static VideoDetailFragment getInstance(final int serviceId, final String videoUrl,
+                                                  final String name) {
         VideoDetailFragment instance = new VideoDetailFragment();
         instance.setInitialData(serviceId, videoUrl, name);
         return instance;
     }
 
+
     /*//////////////////////////////////////////////////////////////////////////
     // Fragment's Lifecycle
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void
-    onCreate(Bundle savedInstanceState) {
+    public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setHasOptionsMenu(true);
 
@@ -227,17 +233,21 @@ public class VideoDetailFragment
     }
 
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(@NonNull final LayoutInflater inflater, final ViewGroup container,
+                             final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_video_detail, container, false);
     }
 
     @Override
     public void onPause() {
         super.onPause();
-        if (currentWorker != null) currentWorker.dispose();
+        if (currentWorker != null) {
+            currentWorker.dispose();
+        }
         PreferenceManager.getDefaultSharedPreferences(getContext())
                 .edit()
-                .putString(getString(R.string.stream_info_selected_tab_key), pageAdapter.getItemTitle(viewPager.getCurrentItem()))
+                .putString(getString(R.string.stream_info_selected_tab_key),
+                        pageAdapter.getItemTitle(viewPager.getCurrentItem()))
                 .apply();
     }
 
@@ -247,9 +257,15 @@ public class VideoDetailFragment
 
         if (updateFlags != 0) {
             if (!isLoading.get() && currentInfo != null) {
-                if ((updateFlags & RELATED_STREAMS_UPDATE_FLAG) != 0) startLoading(false);
-                if ((updateFlags & RESOLUTIONS_MENU_UPDATE_FLAG) != 0) setupActionBar(currentInfo);
-                if ((updateFlags & COMMENTS_UPDATE_FLAG) != 0) startLoading(false);
+                if ((updateFlags & RELATED_STREAMS_UPDATE_FLAG) != 0) {
+                    startLoading(false);
+                }
+                if ((updateFlags & RESOLUTIONS_MENU_UPDATE_FLAG) != 0) {
+                    setupActionBar(currentInfo);
+                }
+                if ((updateFlags & COMMENTS_UPDATE_FLAG) != 0) {
+                    startLoading(false);
+                }
             }
 
             if ((updateFlags & TOOLBAR_ITEMS_UPDATE_FLAG) != 0
@@ -274,9 +290,15 @@ public class VideoDetailFragment
         PreferenceManager.getDefaultSharedPreferences(activity)
                 .unregisterOnSharedPreferenceChangeListener(this);
 
-        if (positionSubscriber != null) positionSubscriber.dispose();
-        if (currentWorker != null) currentWorker.dispose();
-        if (disposables != null) disposables.clear();
+        if (positionSubscriber != null) {
+            positionSubscriber.dispose();
+        }
+        if (currentWorker != null) {
+            currentWorker.dispose();
+        }
+        if (disposables != null) {
+            disposables.clear();
+        }
         positionSubscriber = null;
         currentWorker = null;
         disposables = null;
@@ -284,20 +306,25 @@ public class VideoDetailFragment
 
     @Override
     public void onDestroyView() {
-        if (DEBUG) Log.d(TAG, "onDestroyView() called");
+        if (DEBUG) {
+            Log.d(TAG, "onDestroyView() called");
+        }
         spinnerToolbar.setOnItemSelectedListener(null);
         spinnerToolbar.setAdapter(null);
         super.onDestroyView();
     }
 
     @Override
-    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+    public void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
         switch (requestCode) {
             case ReCaptchaActivity.RECAPTCHA_REQUEST:
                 if (resultCode == Activity.RESULT_OK) {
-                    NavigationHelper.openVideoDetailFragment(getFragmentManager(), serviceId, url, name);
-                } else Log.e(TAG, "ReCaptcha failed");
+                    NavigationHelper
+                            .openVideoDetailFragment(getFragmentManager(), serviceId, url, name);
+                } else {
+                    Log.e(TAG, "ReCaptcha failed");
+                }
                 break;
             default:
                 Log.e(TAG, "Request code from activity not supported [" + requestCode + "]");
@@ -306,7 +333,8 @@ public class VideoDetailFragment
     }
 
     @Override
-    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+    public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences,
+                                          final String key) {
         if (key.equals(getString(R.string.show_next_video_key))) {
             showRelatedStreams = sharedPreferences.getBoolean(key, true);
             updateFlags |= RELATED_STREAMS_UPDATE_FLAG;
@@ -327,11 +355,8 @@ public class VideoDetailFragment
     // State Saving
     //////////////////////////////////////////////////////////////////////////*/
 
-    private static final String INFO_KEY = "info_key";
-    private static final String STACK_KEY = "stack_key";
-
     @Override
-    public void onSaveInstanceState(Bundle outState) {
+    public void onSaveInstanceState(final Bundle outState) {
         super.onSaveInstanceState(outState);
 
         // Check if the next video label and video is visible,
@@ -346,7 +371,7 @@ public class VideoDetailFragment
     }
 
     @Override
-    protected void onRestoreInstanceState(@NonNull Bundle savedState) {
+    protected void onRestoreInstanceState(@NonNull final Bundle savedState) {
         super.onRestoreInstanceState(savedState);
 
         Serializable serializable = savedState.getSerializable(INFO_KEY);
@@ -361,7 +386,6 @@ public class VideoDetailFragment
             //noinspection unchecked
             stack.addAll((Collection<? extends StackItem>) serializable);
         }
-
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -369,8 +393,10 @@ public class VideoDetailFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onClick(View v) {
-        if (isLoading.get() || currentInfo == null) return;
+    public void onClick(final View v) {
+        if (isLoading.get() || currentInfo == null) {
+            return;
+        }
 
         switch (v.getId()) {
             case R.id.detail_controls_background:
@@ -396,14 +422,14 @@ public class VideoDetailFragment
                     Log.w(TAG, "Can't open channel because we got no channel URL");
                 } else {
                     try {
-                    NavigationHelper.openChannelFragment(
-                            getFragmentManager(),
-                            currentInfo.getServiceId(),
-                            currentInfo.getUploaderUrl(),
-                            currentInfo.getUploaderName());
+                        NavigationHelper.openChannelFragment(
+                                getFragmentManager(),
+                                currentInfo.getServiceId(),
+                                currentInfo.getUploaderUrl(),
+                                currentInfo.getUploaderName());
                     } catch (Exception e) {
                         ErrorActivity.reportUiError((AppCompatActivity) getActivity(), e);
-                }
+                    }
                 }
                 break;
             case R.id.detail_thumbnail_root_layout:
@@ -421,8 +447,10 @@ public class VideoDetailFragment
     }
 
     @Override
-    public boolean onLongClick(View v) {
-        if (isLoading.get() || currentInfo == null) return false;
+    public boolean onLongClick(final View v) {
+        if (isLoading.get() || currentInfo == null) {
+            return false;
+        }
 
         switch (v.getId()) {
             case R.id.detail_controls_background:
@@ -459,7 +487,7 @@ public class VideoDetailFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected void initViews(View rootView, Bundle savedInstanceState) {
+    protected void initViews(final View rootView, final Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
         spinnerToolbar = activity.findViewById(R.id.toolbar).findViewById(R.id.toolbar_spinner);
 
@@ -547,41 +575,41 @@ public class VideoDetailFragment
         };
     }
 
-    private void initThumbnailViews(@NonNull StreamInfo info) {
+    private void initThumbnailViews(@NonNull final StreamInfo info) {
         thumbnailImageView.setImageResource(R.drawable.dummy_thumbnail_dark);
         if (!TextUtils.isEmpty(info.getThumbnailUrl())) {
             final String infoServiceName = NewPipe.getNameOfService(info.getServiceId());
             final ImageLoadingListener onFailListener = new SimpleImageLoadingListener() {
                 @Override
-                public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
+                public void onLoadingFailed(final String imageUri, final View view,
+                                            final FailReason failReason) {
                     showSnackBarError(failReason.getCause(), UserAction.LOAD_IMAGE,
                             infoServiceName, imageUri, R.string.could_not_load_thumbnails);
                 }
             };
 
-            imageLoader.displayImage(info.getThumbnailUrl(), thumbnailImageView,
+            IMAGE_LOADER.displayImage(info.getThumbnailUrl(), thumbnailImageView,
                     ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS, onFailListener);
         }
 
         if (!TextUtils.isEmpty(info.getUploaderAvatarUrl())) {
-            imageLoader.displayImage(info.getUploaderAvatarUrl(), uploaderThumb,
+            IMAGE_LOADER.displayImage(info.getUploaderAvatarUrl(), uploaderThumb,
                     ImageDisplayConstants.DISPLAY_AVATAR_OPTIONS);
         }
     }
 
-
     /*//////////////////////////////////////////////////////////////////////////
     // Menu
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
-        this.menu = menu;
+    public void onCreateOptionsMenu(final Menu m, final MenuInflater inflater) {
+        this.menu = m;
 
         // CAUTION set item properties programmatically otherwise it would not be accepted by
         // appcompat itemsinflater.inflate(R.menu.videoitem_detail, menu);
 
-        inflater.inflate(R.menu.video_detail_menu, menu);
+        inflater.inflate(R.menu.video_detail_menu, m);
 
         updateMenuItemVisibility();
 
@@ -593,7 +621,6 @@ public class VideoDetailFragment
     }
 
     private void updateMenuItemVisibility() {
-
         // show kodi if set in settings
         menu.findItem(R.id.action_play_with_kodi).setVisible(
                 PreferenceManager.getDefaultSharedPreferences(activity).getBoolean(
@@ -601,7 +628,7 @@ public class VideoDetailFragment
     }
 
     @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
+    public boolean onOptionsItemSelected(final MenuItem item) {
         int id = item.getItemId();
         if (id == R.id.action_settings) {
             NavigationHelper.openSettings(requireContext());
@@ -614,24 +641,25 @@ public class VideoDetailFragment
         }
 
         switch (id) {
-            case R.id.menu_item_share: {
+            case R.id.menu_item_share:
                 if (currentInfo != null) {
-                    ShareUtils.shareUrl(requireContext(), currentInfo.getName(), currentInfo.getOriginalUrl());
+                    ShareUtils.shareUrl(requireContext(), currentInfo.getName(),
+                            currentInfo.getOriginalUrl());
                 }
                 return true;
-            }
-            case R.id.menu_item_openInBrowser: {
+            case R.id.menu_item_openInBrowser:
                 if (currentInfo != null) {
                     ShareUtils.openUrlInBrowser(requireContext(), currentInfo.getOriginalUrl());
                 }
                 return true;
-            }
             case R.id.action_play_with_kodi:
                 try {
                     NavigationHelper.playWithKore(activity, Uri.parse(
                             url.replace("https", "http")));
                 } catch (Exception e) {
-                    if (DEBUG) Log.i(TAG, "Failed to start kore", e);
+                    if (DEBUG) {
+                        Log.i(TAG, "Failed to start kore", e);
+                    }
                     KoreUtil.showInstallKoreDialog(activity);
                 }
                 return true;
@@ -640,37 +668,39 @@ public class VideoDetailFragment
         }
     }
 
-    private void setupActionBarOnError(final String url) {
-        if (DEBUG) Log.d(TAG, "setupActionBarHandlerOnError() called with: url = [" + url + "]");
+    private void setupActionBarOnError(final String u) {
+        if (DEBUG) {
+            Log.d(TAG, "setupActionBarHandlerOnError() called with: url = [" + u + "]");
+        }
         Log.e("-----", "missing code");
     }
 
     private void setupActionBar(final StreamInfo info) {
-        if (DEBUG) Log.d(TAG, "setupActionBarHandler() called with: info = [" + info + "]");
+        if (DEBUG) {
+            Log.d(TAG, "setupActionBarHandler() called with: info = [" + info + "]");
+        }
         boolean isExternalPlayerEnabled = PreferenceManager.getDefaultSharedPreferences(activity)
                 .getBoolean(activity.getString(R.string.use_external_video_player_key), false);
 
-        sortedVideoStreams = ListHelper.getSortedStreamVideosList(
-                activity,
-                info.getVideoStreams(),
-                info.getVideoOnlyStreams(),
-                false);
-        selectedVideoStreamIndex = ListHelper.getDefaultResolutionIndex(activity, sortedVideoStreams);
+        sortedVideoStreams = ListHelper.getSortedStreamVideosList(activity, info.getVideoStreams(),
+                info.getVideoOnlyStreams(), false);
+        selectedVideoStreamIndex = ListHelper
+                .getDefaultResolutionIndex(activity, sortedVideoStreams);
 
-        final StreamItemAdapter<VideoStream, Stream> streamsAdapter =
-                new StreamItemAdapter<>(activity,
-                        new StreamSizeWrapper<>(sortedVideoStreams, activity), isExternalPlayerEnabled);
+        final StreamItemAdapter<VideoStream, Stream> streamsAdapter = new StreamItemAdapter<>(
+                activity, new StreamSizeWrapper<>(sortedVideoStreams, activity),
+                isExternalPlayerEnabled);
         spinnerToolbar.setAdapter(streamsAdapter);
         spinnerToolbar.setSelection(selectedVideoStreamIndex);
         spinnerToolbar.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
             @Override
-            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+            public void onItemSelected(final AdapterView<?> parent, final View view,
+                                       final int position, final long id) {
                 selectedVideoStreamIndex = position;
             }
 
             @Override
-            public void onNothingSelected(AdapterView<?> parent) {
-            }
+            public void onNothingSelected(final AdapterView<?> parent) { }
         });
     }
 
@@ -678,37 +708,31 @@ public class VideoDetailFragment
     // OwnStack
     //////////////////////////////////////////////////////////////////////////*/
 
-    /**
-     * Stack that contains the "navigation history".<br>
-     * The peek is the current video.
-     */
-    protected final LinkedList<StackItem> stack = new LinkedList<>();
-
-    public void pushToStack(int serviceId, String videoUrl, String name) {
+    private void pushToStack(final int sid, final String videoUrl, final String title) {
         if (DEBUG) {
             Log.d(TAG, "pushToStack() called with: serviceId = ["
-                    + serviceId + "], videoUrl = [" + videoUrl + "], name = [" + name + "]");
+                    + sid + "], videoUrl = [" + videoUrl + "], title = [" + title + "]");
         }
 
         if (stack.size() > 0
-                && stack.peek().getServiceId() == serviceId
+                && stack.peek().getServiceId() == sid
                 && stack.peek().getUrl().equals(videoUrl)) {
             Log.d(TAG, "pushToStack() called with: serviceId == peek.serviceId = ["
-                    + serviceId + "], videoUrl == peek.getUrl = [" + videoUrl + "]");
+                    + sid + "], videoUrl == peek.getUrl = [" + videoUrl + "]");
             return;
         } else {
             Log.d(TAG, "pushToStack() wasn't equal");
         }
 
-        stack.push(new StackItem(serviceId, videoUrl, name));
+        stack.push(new StackItem(sid, videoUrl, title));
     }
 
-    public void setTitleToUrl(int serviceId, String videoUrl, String name) {
-        if (name != null && !name.isEmpty()) {
+    private void setTitleToUrl(final int sid, final String videoUrl, final String title) {
+        if (title != null && !title.isEmpty()) {
             for (StackItem stackItem : stack) {
-                if (stack.peek().getServiceId() == serviceId
+                if (stack.peek().getServiceId() == sid
                         && stackItem.getUrl().equals(videoUrl)) {
-                    stackItem.setTitle(name);
+                    stackItem.setTitle(title);
                 }
             }
         }
@@ -716,20 +740,21 @@ public class VideoDetailFragment
 
     @Override
     public boolean onBackPressed() {
-        if (DEBUG) Log.d(TAG, "onBackPressed() called");
+        if (DEBUG) {
+            Log.d(TAG, "onBackPressed() called");
+        }
         // That means that we are on the start of the stack,
         // return false to let the MainActivity handle the onBack
-        if (stack.size() <= 1) return false;
+        if (stack.size() <= 1) {
+            return false;
+        }
         // Remove top
         stack.pop();
         // Get stack item from the new top
         StackItem peek = stack.peek();
 
-        selectAndLoadVideo(peek.getServiceId(),
-                peek.getUrl(),
-                !TextUtils.isEmpty(peek.getTitle())
-                        ? peek.getTitle()
-                        : "");
+        selectAndLoadVideo(peek.getServiceId(), peek.getUrl(),
+                !TextUtils.isEmpty(peek.getTitle()) ? peek.getTitle() : "");
         return true;
     }
 
@@ -739,43 +764,52 @@ public class VideoDetailFragment
 
     @Override
     protected void doInitialLoadLogic() {
-        if (currentInfo == null) prepareAndLoadInfo();
-        else prepareAndHandleInfo(currentInfo, false);
+        if (currentInfo == null) {
+            prepareAndLoadInfo();
+        } else {
+            prepareAndHandleInfo(currentInfo, false);
+        }
     }
 
-    public void selectAndLoadVideo(int serviceId, String videoUrl, String name) {
-        setInitialData(serviceId, videoUrl, name);
+    public void selectAndLoadVideo(final int sid, final String videoUrl, final String title) {
+        setInitialData(sid, videoUrl, title);
         prepareAndLoadInfo();
     }
 
-    public void prepareAndHandleInfo(final StreamInfo info, boolean scrollToTop) {
-        if (DEBUG) Log.d(TAG, "prepareAndHandleInfo() called with: info = ["
-                + info + "], scrollToTop = [" + scrollToTop + "]");
+    private void prepareAndHandleInfo(final StreamInfo info, final boolean scrollToTop) {
+        if (DEBUG) {
+            Log.d(TAG, "prepareAndHandleInfo() called with: "
+                    + "info = [" + info + "], scrollToTop = [" + scrollToTop + "]");
+        }
 
         setInitialData(info.getServiceId(), info.getUrl(), info.getName());
         pushToStack(serviceId, url, name);
         showLoading();
         initTabs();
 
-        if (scrollToTop) appBarLayout.setExpanded(true, true);
+        if (scrollToTop) {
+            appBarLayout.setExpanded(true, true);
+        }
         handleResult(info);
         showContent();
 
     }
 
-    protected void prepareAndLoadInfo() {
+    private void prepareAndLoadInfo() {
         appBarLayout.setExpanded(true, true);
         pushToStack(serviceId, url, name);
         startLoading(false);
     }
 
     @Override
-    public void startLoading(boolean forceLoad) {
+    public void startLoading(final boolean forceLoad) {
         super.startLoading(forceLoad);
 
         initTabs();
         currentInfo = null;
-        if (currentWorker != null) currentWorker.dispose();
+        if (currentWorker != null) {
+            currentWorker.dispose();
+        }
 
         currentWorker = ExtractorHelper.getStreamInfo(serviceId, url, forceLoad)
                 .subscribeOn(Schedulers.io())
@@ -798,26 +832,29 @@ public class VideoDetailFragment
         }
         pageAdapter.clearAllItems();
 
-        if(shouldShowComments()){
-            pageAdapter.addFragment(CommentsFragment.getInstance(serviceId, url, name), COMMENTS_TAB_TAG);
+        if (shouldShowComments()) {
+            pageAdapter.addFragment(CommentsFragment.getInstance(serviceId, url, name),
+                    COMMENTS_TAB_TAG);
         }
 
-        if(showRelatedStreams && null == relatedStreamsLayout){
+        if (showRelatedStreams && null == relatedStreamsLayout) {
             //temp empty fragment. will be updated in handleResult
             pageAdapter.addFragment(new Fragment(), RELATED_TAB_TAG);
         }
 
-        if(pageAdapter.getCount() == 0){
+        if (pageAdapter.getCount() == 0) {
             pageAdapter.addFragment(new EmptyFragment(), EMPTY_TAB_TAG);
         }
 
         pageAdapter.notifyDataSetUpdate();
 
-        if(pageAdapter.getCount() < 2){
+        if (pageAdapter.getCount() < 2) {
             tabLayout.setVisibility(View.GONE);
-        }else{
+        } else {
             int position = pageAdapter.getItemPositionByTitle(selectedTabTag);
-            if(position != -1) viewPager.setCurrentItem(position);
+            if (position != -1) {
+                viewPager.setCurrentItem(position);
+            }
             tabLayout.setVisibility(View.VISIBLE);
         }
     }
@@ -862,9 +899,8 @@ public class VideoDetailFragment
             NavigationHelper.enqueueOnPopupPlayer(activity, itemQueue, false);
         } else {
             Toast.makeText(activity, R.string.popup_playing_toast, Toast.LENGTH_SHORT).show();
-            final Intent intent = NavigationHelper.getPlayerIntent(
-                    activity, PopupVideoPlayer.class, itemQueue, getSelectedVideoStream().resolution, true
-            );
+            final Intent intent = NavigationHelper.getPlayerIntent(activity,
+                    PopupVideoPlayer.class, itemQueue, getSelectedVideoStream().resolution, true);
             activity.startService(intent);
         }
     }
@@ -903,7 +939,7 @@ public class VideoDetailFragment
     // Utils
     //////////////////////////////////////////////////////////////////////////*/
 
-    public void setAutoplay(boolean autoplay) {
+    public void setAutoplay(final boolean autoplay) {
         this.autoPlayEnabled = autoplay;
     }
 
@@ -916,7 +952,7 @@ public class VideoDetailFragment
         final HistoryRecordManager recordManager = new HistoryRecordManager(requireContext());
         disposables.add(recordManager.onViewed(info).onErrorComplete()
                 .subscribe(
-                        ignored -> {/* successful */},
+                        ignored -> { /* successful */ },
                         error -> Log.e(TAG, "Register view failure: ", error)
                 ));
     }
@@ -926,8 +962,9 @@ public class VideoDetailFragment
         return sortedVideoStreams != null ? sortedVideoStreams.get(selectedVideoStreamIndex) : null;
     }
 
-    private void prepareDescription(Description description) {
-        if (TextUtils.isEmpty(description.getContent()) || description == Description.emptyDescription) {
+    private void prepareDescription(final Description description) {
+        if (TextUtils.isEmpty(description.getContent())
+                || description == Description.emptyDescription) {
             return;
         }
 
@@ -978,14 +1015,16 @@ public class VideoDetailFragment
         contentRootLayoutHiding.setVisibility(View.VISIBLE);
     }
 
-    protected void setInitialData(int serviceId, String url, String name) {
-        this.serviceId = serviceId;
-        this.url = url;
-        this.name = !TextUtils.isEmpty(name) ? name : "";
+    protected void setInitialData(final int sid, final String u, final String title) {
+        this.serviceId = sid;
+        this.url = u;
+        this.name = !TextUtils.isEmpty(title) ? title : "";
     }
 
     private void setErrorImage(final int imageResource) {
-        if (thumbnailImageView == null || activity == null) return;
+        if (thumbnailImageView == null || activity == null) {
+            return;
+        }
 
         thumbnailImageView.setImageDrawable(ContextCompat.getDrawable(activity, imageResource));
         animateView(thumbnailImageView, false, 0, 0,
@@ -993,11 +1032,12 @@ public class VideoDetailFragment
     }
 
     @Override
-    public void showError(String message, boolean showRetryButton) {
+    public void showError(final String message, final boolean showRetryButton) {
         showError(message, showRetryButton, R.drawable.not_available_monkey);
     }
 
-    protected void showError(String message, boolean showRetryButton, @DrawableRes int imageError) {
+    protected void showError(final String message, final boolean showRetryButton,
+                             @DrawableRes final int imageError) {
         super.showError(message, showRetryButton);
         setErrorImage(imageError);
     }
@@ -1012,7 +1052,7 @@ public class VideoDetailFragment
         super.showLoading();
 
         //if data is already cached, transition from VISIBLE -> INVISIBLE -> VISIBLE is not required
-        if(!ExtractorHelper.isCached(serviceId, url, InfoItem.InfoType.STREAM)){
+        if (!ExtractorHelper.isCached(serviceId, url, InfoItem.InfoType.STREAM)) {
             contentRootLayoutHiding.setVisibility(View.INVISIBLE);
         }
 
@@ -1031,33 +1071,35 @@ public class VideoDetailFragment
         videoTitleToggleArrow.setVisibility(View.GONE);
         videoTitleRoot.setClickable(false);
 
-        if(relatedStreamsLayout != null){
-            if(showRelatedStreams){
+        if (relatedStreamsLayout != null) {
+            if (showRelatedStreams) {
                 relatedStreamsLayout.setVisibility(View.INVISIBLE);
-            }else{
+            } else {
                 relatedStreamsLayout.setVisibility(View.GONE);
             }
         }
 
-        imageLoader.cancelDisplayTask(thumbnailImageView);
-        imageLoader.cancelDisplayTask(uploaderThumb);
+        IMAGE_LOADER.cancelDisplayTask(thumbnailImageView);
+        IMAGE_LOADER.cancelDisplayTask(uploaderThumb);
         thumbnailImageView.setImageBitmap(null);
         uploaderThumb.setImageBitmap(null);
     }
 
     @Override
-    public void handleResult(@NonNull StreamInfo info) {
+    public void handleResult(@NonNull final StreamInfo info) {
         super.handleResult(info);
 
         setInitialData(info.getServiceId(), info.getOriginalUrl(), info.getName());
 
-        if(showRelatedStreams){
-            if(null == relatedStreamsLayout){ //phone
-                pageAdapter.updateItem(RELATED_TAB_TAG, RelatedVideosFragment.getInstance(currentInfo));
+        if (showRelatedStreams) {
+            if (null == relatedStreamsLayout) { //phone
+                pageAdapter.updateItem(RELATED_TAB_TAG,
+                        RelatedVideosFragment.getInstance(currentInfo));
                 pageAdapter.notifyDataSetUpdate();
-            }else{ //tablet
+            } else { //tablet
                 getChildFragmentManager().beginTransaction()
-                        .replace(R.id.relatedStreamsLayout, RelatedVideosFragment.getInstance(currentInfo))
+                        .replace(R.id.relatedStreamsLayout,
+                                RelatedVideosFragment.getInstance(currentInfo))
                         .commitNow();
                 relatedStreamsLayout.setVisibility(View.VISIBLE);
             }
@@ -1081,9 +1123,11 @@ public class VideoDetailFragment
             if (info.getStreamType().equals(StreamType.AUDIO_LIVE_STREAM)) {
                 videoCountView.setText(Localization.listeningCount(activity, info.getViewCount()));
             } else if (info.getStreamType().equals(StreamType.LIVE_STREAM)) {
-                videoCountView.setText(Localization.localizeWatchingCount(activity, info.getViewCount()));
+                videoCountView.setText(Localization
+                        .localizeWatchingCount(activity, info.getViewCount()));
             } else {
-                videoCountView.setText(Localization.localizeViewCount(activity, info.getViewCount()));
+                videoCountView.setText(Localization
+                        .localizeViewCount(activity, info.getViewCount()));
             }
             videoCountView.setVisibility(View.VISIBLE);
         } else {
@@ -1099,7 +1143,8 @@ public class VideoDetailFragment
             thumbsDisabledTextView.setVisibility(View.VISIBLE);
         } else {
             if (info.getDislikeCount() >= 0) {
-                thumbsDownTextView.setText(Localization.shortCount(activity, info.getDislikeCount()));
+                thumbsDownTextView.setText(Localization
+                        .shortCount(activity, info.getDislikeCount()));
                 thumbsDownTextView.setVisibility(View.VISIBLE);
                 thumbsDownImageView.setVisibility(View.VISIBLE);
             } else {
@@ -1139,7 +1184,8 @@ public class VideoDetailFragment
         videoDescriptionRootLayout.setVisibility(View.GONE);
 
         if (info.getUploadDate() != null) {
-            videoUploadDateView.setText(Localization.localizeUploadDate(activity, info.getUploadDate().date().getTime()));
+            videoUploadDateView.setText(Localization
+                    .localizeUploadDate(activity, info.getUploadDate().date().getTime()));
             videoUploadDateView.setVisibility(View.VISIBLE);
         } else {
             videoUploadDateView.setText(null);
@@ -1171,9 +1217,12 @@ public class VideoDetailFragment
                 spinnerToolbar.setVisibility(View.GONE);
                 break;
             default:
-                if(info.getAudioStreams().isEmpty()) detailControlsBackground.setVisibility(View.GONE);
-                if (!info.getVideoStreams().isEmpty()
-                        || !info.getVideoOnlyStreams().isEmpty()) break;
+                if (info.getAudioStreams().isEmpty()) {
+                    detailControlsBackground.setVisibility(View.GONE);
+                }
+                if (!info.getVideoStreams().isEmpty() || !info.getVideoOnlyStreams().isEmpty()) {
+                    break;
+                }
 
                 detailControlsPopup.setVisibility(View.GONE);
                 spinnerToolbar.setVisibility(View.GONE);
@@ -1190,28 +1239,28 @@ public class VideoDetailFragment
 
 
     public void openDownloadDialog() {
-            try {
-                DownloadDialog downloadDialog = DownloadDialog.newInstance(currentInfo);
-                downloadDialog.setVideoStreams(sortedVideoStreams);
-                downloadDialog.setAudioStreams(currentInfo.getAudioStreams());
-                downloadDialog.setSelectedVideoStream(selectedVideoStreamIndex);
-                downloadDialog.setSubtitleStreams(currentInfo.getSubtitles());
+        try {
+            DownloadDialog downloadDialog = DownloadDialog.newInstance(currentInfo);
+            downloadDialog.setVideoStreams(sortedVideoStreams);
+            downloadDialog.setAudioStreams(currentInfo.getAudioStreams());
+            downloadDialog.setSelectedVideoStream(selectedVideoStreamIndex);
+            downloadDialog.setSubtitleStreams(currentInfo.getSubtitles());
 
-                downloadDialog.show(getActivity().getSupportFragmentManager(), "downloadDialog");
-            } catch (Exception e) {
-                ErrorActivity.ErrorInfo info = ErrorActivity.ErrorInfo.make(UserAction.UI_ERROR,
-                        ServiceList.all()
-                                .get(currentInfo
-                                        .getServiceId())
-                                .getServiceInfo()
-                                .getName(), "",
-                        R.string.could_not_setup_download_menu);
+            downloadDialog.show(getActivity().getSupportFragmentManager(), "downloadDialog");
+        } catch (Exception e) {
+            ErrorActivity.ErrorInfo info = ErrorActivity.ErrorInfo.make(UserAction.UI_ERROR,
+                    ServiceList.all()
+                            .get(currentInfo
+                                    .getServiceId())
+                            .getServiceInfo()
+                            .getName(), "",
+                    R.string.could_not_setup_download_menu);
 
-                ErrorActivity.reportError(getActivity(),
-                        e,
-                        getActivity().getClass(),
-                        getActivity().findViewById(android.R.id.content), info);
-            }
+            ErrorActivity.reportError(getActivity(),
+                    e,
+                    getActivity().getClass(),
+                    getActivity().findViewById(android.R.id.content), info);
+        }
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -1219,12 +1268,16 @@ public class VideoDetailFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected boolean onError(Throwable exception) {
-        if (super.onError(exception)) return true;
+    protected boolean onError(final Throwable exception) {
+        if (super.onError(exception)) {
+            return true;
+        }
 
-        int errorId = exception instanceof YoutubeStreamExtractor.DecryptException ? R.string.youtube_signature_decryption_error
-                : exception instanceof ExtractionException ? R.string.parsing_error
-                : R.string.general_error;
+        int errorId = exception instanceof YoutubeStreamExtractor.DecryptException
+                ? R.string.youtube_signature_decryption_error
+                : exception instanceof ExtractionException
+                        ? R.string.parsing_error
+                        : R.string.general_error;
 
         onUnrecoverableError(exception, UserAction.REQUESTED_STREAM,
                 NewPipe.getNameOfService(serviceId), url, errorId);
@@ -1237,9 +1290,9 @@ public class VideoDetailFragment
             positionSubscriber.dispose();
         }
         final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
-        final boolean playbackResumeEnabled =
-                prefs.getBoolean(activity.getString(R.string.enable_watch_history_key), true)
-                        && prefs.getBoolean(activity.getString(R.string.enable_playback_resume_key), true);
+        final boolean playbackResumeEnabled = prefs
+                .getBoolean(activity.getString(R.string.enable_watch_history_key), true)
+                && prefs.getBoolean(activity.getString(R.string.enable_playback_resume_key), true);
 
         if (!playbackResumeEnabled || info.getDuration() <= 0) {
             positionView.setVisibility(View.INVISIBLE);
@@ -1247,8 +1300,8 @@ public class VideoDetailFragment
 
             // TODO: Remove this check when separation of concerns is done.
             //  (live streams weren't getting updated because they are mixed)
-            if (!info.getStreamType().equals(StreamType.LIVE_STREAM) &&
-                    !info.getStreamType().equals(StreamType.AUDIO_LIVE_STREAM)) {
+            if (!info.getStreamType().equals(StreamType.LIVE_STREAM)
+                    && !info.getStreamType().equals(StreamType.AUDIO_LIVE_STREAM)) {
                 return;
             }
         }
@@ -1261,14 +1314,17 @@ public class VideoDetailFragment
                 .onErrorComplete()
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(state -> {
-                    final int seconds = (int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime());
+                    final int seconds
+                            = (int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime());
                     positionView.setMax((int) info.getDuration());
                     positionView.setProgressAnimated(seconds);
                     detailPositionView.setText(Localization.getDurationString(seconds));
                     animateView(positionView, true, 500);
                     animateView(detailPositionView, true, 500);
                 }, e -> {
-                    if (DEBUG) e.printStackTrace();
+                    if (DEBUG) {
+                        e.printStackTrace();
+                    }
                 }, () -> {
                     animateView(positionView, false, 500);
                     animateView(detailPositionView, false, 500);

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListFragment.java

@@ -7,16 +7,17 @@ import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.View;
+
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.recyclerview.widget.GridLayoutManager;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
-import android.util.Log;
-import android.view.Menu;
-import android.view.MenuInflater;
-import android.view.View;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.InfoItem;
@@ -42,7 +43,14 @@ import java.util.Queue;
 
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
-public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implements ListViewContract<I, N>, StateSaver.WriteRead, SharedPreferences.OnSharedPreferenceChangeListener {
+public abstract class BaseListFragment<I, N> extends BaseStateFragment<I>
+        implements ListViewContract<I, N>, StateSaver.WriteRead,
+        SharedPreferences.OnSharedPreferenceChangeListener {
+    private static final int LIST_MODE_UPDATE_FLAG = 0x32;
+    protected StateSaver.SavedState savedState;
+
+    private boolean useDefaultStateSaving = true;
+    private int updateFlags = 0;
 
     /*//////////////////////////////////////////////////////////////////////////
     // Views
@@ -50,17 +58,14 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
 
     protected InfoListAdapter infoListAdapter;
     protected RecyclerView itemsList;
-    private int updateFlags = 0;
     private int focusedPosition = -1;
 
-    private static final int LIST_MODE_UPDATE_FLAG = 0x32;
-
     /*//////////////////////////////////////////////////////////////////////////
     // LifeCycle
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(final Context context) {
         super.onAttach(context);
 
         if (infoListAdapter == null) {
@@ -74,7 +79,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     }
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
+    public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setHasOptionsMenu(true);
         PreferenceManager.getDefaultSharedPreferences(activity)
@@ -84,7 +89,9 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     @Override
     public void onDestroy() {
         super.onDestroy();
-        if (useDefaultStateSaving) StateSaver.onDestroy(savedState);
+        if (useDefaultStateSaving) {
+            StateSaver.onDestroy(savedState);
+        }
         PreferenceManager.getDefaultSharedPreferences(activity)
                 .unregisterOnSharedPreferenceChangeListener(this);
     }
@@ -96,8 +103,9 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
         if (updateFlags != 0) {
             if ((updateFlags & LIST_MODE_UPDATE_FLAG) != 0) {
                 final boolean useGrid = isGridLayout();
-                itemsList.setLayoutManager(useGrid ? getGridLayoutManager() : getListLayoutManager());
-                infoListAdapter.setGridItemVariants(useGrid);
+                itemsList.setLayoutManager(useGrid
+                        ? getGridLayoutManager() : getListLayoutManager());
+                infoListAdapter.setUseGridVariant(useGrid);
                 infoListAdapter.notifyDataSetChanged();
             }
             updateFlags = 0;
@@ -108,16 +116,14 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     // State Saving
     //////////////////////////////////////////////////////////////////////////*/
 
-    protected StateSaver.SavedState savedState;
-    protected boolean useDefaultStateSaving = true;
-
     /**
      * If the default implementation of {@link StateSaver.WriteRead} should be used.
      *
      * @see StateSaver
+     * @param useDefaultStateSaving Whether the default implementation should be used
      */
-    public void useDefaultStateSaving(boolean useDefault) {
-        this.useDefaultStateSaving = useDefault;
+    public void setUseDefaultStateSaving(final boolean useDefaultStateSaving) {
+        this.useDefaultStateSaving = useDefaultStateSaving;
     }
 
     @Override
@@ -139,7 +145,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     }
 
     @Override
-    public void writeTo(Queue<Object> objectsToSave) {
+    public void writeTo(final Queue<Object> objectsToSave) {
         if (!useDefaultStateSaving) {
             return;
         }
@@ -150,7 +156,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
 
     @Override
     @SuppressWarnings("unchecked")
-    public void readFrom(@NonNull Queue<Object> savedObjects) throws Exception {
+    public void readFrom(@NonNull final Queue<Object> savedObjects) throws Exception {
         if (!useDefaultStateSaving) {
             return;
         }
@@ -174,15 +180,20 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     }
 
     @Override
-    public void onSaveInstanceState(Bundle bundle) {
+    public void onSaveInstanceState(final Bundle bundle) {
         super.onSaveInstanceState(bundle);
-        if (useDefaultStateSaving) savedState = StateSaver.tryToSave(activity.isChangingConfigurations(), savedState, bundle, this);
+        if (useDefaultStateSaving) {
+            savedState = StateSaver
+                    .tryToSave(activity.isChangingConfigurations(), savedState, bundle, this);
+        }
     }
 
     @Override
-    protected void onRestoreInstanceState(@NonNull Bundle bundle) {
+    protected void onRestoreInstanceState(@NonNull final Bundle bundle) {
         super.onRestoreInstanceState(bundle);
-        if (useDefaultStateSaving) savedState = StateSaver.tryToRestore(bundle, this);
+        if (useDefaultStateSaving) {
+            savedState = StateSaver.tryToRestore(bundle, this);
+        }
     }
 
     @Override
@@ -217,29 +228,32 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
         final Resources resources = activity.getResources();
         int width = resources.getDimensionPixelSize(R.dimen.video_item_grid_thumbnail_image_width);
         width += (24 * resources.getDisplayMetrics().density);
-        final int spanCount = (int) Math.floor(resources.getDisplayMetrics().widthPixels / (double)width);
+        final int spanCount = (int) Math.floor(resources.getDisplayMetrics().widthPixels
+                / (double) width);
         final GridLayoutManager lm = new GridLayoutManager(activity, spanCount);
         lm.setSpanSizeLookup(infoListAdapter.getSpanSizeLookup(spanCount));
         return lm;
     }
 
     @Override
-    protected void initViews(View rootView, Bundle savedInstanceState) {
+    protected void initViews(final View rootView, final Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
 
         final boolean useGrid = isGridLayout();
         itemsList = rootView.findViewById(R.id.items_list);
         itemsList.setLayoutManager(useGrid ? getGridLayoutManager() : getListLayoutManager());
 
-        infoListAdapter.setGridItemVariants(useGrid);
+        infoListAdapter.setUseGridVariant(useGrid);
         infoListAdapter.setFooter(getListFooter());
         infoListAdapter.setHeader(getListHeader());
 
         itemsList.setAdapter(infoListAdapter);
     }
 
-    protected void onItemSelected(InfoItem selectedItem) {
-        if (DEBUG) Log.d(TAG, "onItemSelected() called with: selectedItem = [" + selectedItem + "]");
+    protected void onItemSelected(final InfoItem selectedItem) {
+        if (DEBUG) {
+            Log.d(TAG, "onItemSelected() called with: selectedItem = [" + selectedItem + "]");
+        }
     }
 
     @Override
@@ -247,19 +261,19 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
         super.initListeners();
         infoListAdapter.setOnStreamSelectedListener(new OnClickGesture<StreamInfoItem>() {
             @Override
-            public void selected(StreamInfoItem selectedItem) {
+            public void selected(final StreamInfoItem selectedItem) {
                 onStreamSelected(selectedItem);
             }
 
             @Override
-            public void held(StreamInfoItem selectedItem) {
+            public void held(final StreamInfoItem selectedItem) {
                 showStreamDialog(selectedItem);
             }
         });
 
         infoListAdapter.setOnChannelSelectedListener(new OnClickGesture<ChannelInfoItem>() {
             @Override
-            public void selected(ChannelInfoItem selectedItem) {
+            public void selected(final ChannelInfoItem selectedItem) {
                 try {
                     onItemSelected(selectedItem);
                     NavigationHelper.openChannelFragment(getFM(),
@@ -274,7 +288,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
 
         infoListAdapter.setOnPlaylistSelectedListener(new OnClickGesture<PlaylistInfoItem>() {
             @Override
-            public void selected(PlaylistInfoItem selectedItem) {
+            public void selected(final PlaylistInfoItem selectedItem) {
                 try {
                     onItemSelected(selectedItem);
                     NavigationHelper.openPlaylistFragment(getFM(),
@@ -289,7 +303,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
 
         infoListAdapter.setOnCommentsSelectedListener(new OnClickGesture<CommentsInfoItem>() {
             @Override
-            public void selected(CommentsInfoItem selectedItem) {
+            public void selected(final CommentsInfoItem selectedItem) {
                 onItemSelected(selectedItem);
             }
         });
@@ -297,13 +311,13 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
         itemsList.clearOnScrollListeners();
         itemsList.addOnScrollListener(new OnScrollBelowItemsListener() {
             @Override
-            public void onScrolledDown(RecyclerView recyclerView) {
+            public void onScrolledDown(final RecyclerView recyclerView) {
                 onScrollToBottom();
             }
         });
     }
 
-    private void onStreamSelected(StreamInfoItem selectedItem) {
+    private void onStreamSelected(final StreamInfoItem selectedItem) {
         onItemSelected(selectedItem);
         NavigationHelper.openVideoDetailFragment(getFM(),
                 selectedItem.getServiceId(), selectedItem.getUrl(), selectedItem.getName());
@@ -316,12 +330,12 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     }
 
 
-
-
     protected void showStreamDialog(final StreamInfoItem item) {
         final Context context = getContext();
         final Activity activity = getActivity();
-        if (context == null || context.getResources() == null || activity == null) return;
+        if (context == null || context.getResources() == null || activity == null) {
+            return;
+        }
 
         if (item.getStreamType() == StreamType.AUDIO_STREAM) {
             StreamDialogEntry.setEnabledEntries(
@@ -339,8 +353,8 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
                     StreamDialogEntry.share);
         }
 
-        new InfoItemDialog(activity, item, StreamDialogEntry.getCommands(context), (dialog, which) ->
-            StreamDialogEntry.clickOn(which, this, item)).show();
+        new InfoItemDialog(activity, item, StreamDialogEntry.getCommands(context),
+                (dialog, which) -> StreamDialogEntry.clickOn(which, this, item)).show();
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -348,8 +362,11 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
-        if (DEBUG) Log.d(TAG, "onCreateOptionsMenu() called with: menu = [" + menu + "], inflater = [" + inflater + "]");
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
+        if (DEBUG) {
+            Log.d(TAG, "onCreateOptionsMenu() called with: "
+                    + "menu = [" + menu + "], inflater = [" + inflater + "]");
+        }
         super.onCreateOptionsMenu(menu, inflater);
         ActionBar supportActionBar = activity.getSupportActionBar();
         if (supportActionBar != null) {
@@ -387,7 +404,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     }
 
     @Override
-    public void showError(String message, boolean showRetryButton) {
+    public void showError(final String message, final boolean showRetryButton) {
         super.showError(message, showRetryButton);
         showListFooter(false);
         animateView(itemsList, false, 200);
@@ -409,25 +426,28 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     }
 
     @Override
-    public void handleNextItems(N result) {
+    public void handleNextItems(final N result) {
         isLoading.set(false);
     }
 
     @Override
-    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+    public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences,
+                                          final String key) {
         if (key.equals(getString(R.string.list_view_mode_key))) {
             updateFlags |= LIST_MODE_UPDATE_FLAG;
         }
     }
 
     protected boolean isGridLayout() {
-        final String list_mode = PreferenceManager.getDefaultSharedPreferences(activity).getString(getString(R.string.list_view_mode_key), getString(R.string.list_view_mode_value));
-        if ("auto".equals(list_mode)) {
+        final String listMode = PreferenceManager.getDefaultSharedPreferences(activity)
+                .getString(getString(R.string.list_view_mode_key),
+                        getString(R.string.list_view_mode_value));
+        if ("auto".equals(listMode)) {
             final Configuration configuration = getResources().getConfiguration();
             return configuration.orientation == Configuration.ORIENTATION_LANDSCAPE
                     && configuration.isLayoutSizeAtLeast(Configuration.SCREENLAYOUT_SIZE_LARGE);
         } else {
-            return "grid".equals(list_mode);
+            return "grid".equals(listMode);
         }
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListInfoFragment.java

@@ -24,7 +24,6 @@ import io.reactivex.schedulers.Schedulers;
 
 public abstract class BaseListInfoFragment<I extends ListInfo>
         extends BaseListFragment<I, ListExtractor.InfoItemsPage> {
-
     @State
     protected int serviceId = Constants.NO_SERVICE_ID;
     @State
@@ -37,7 +36,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
     protected Disposable currentWorker;
 
     @Override
-    protected void initViews(View rootView, Bundle savedInstanceState) {
+    protected void initViews(final View rootView, final Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
         setTitle(name);
         showListFooter(hasMoreItems());
@@ -46,7 +45,9 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
     @Override
     public void onPause() {
         super.onPause();
-        if (currentWorker != null) currentWorker.dispose();
+        if (currentWorker != null) {
+            currentWorker.dispose();
+        }
     }
 
     @Override
@@ -76,7 +77,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void writeTo(Queue<Object> objectsToSave) {
+    public void writeTo(final Queue<Object> objectsToSave) {
         super.writeTo(objectsToSave);
         objectsToSave.add(currentInfo);
         objectsToSave.add(currentNextPageUrl);
@@ -84,7 +85,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
 
     @Override
     @SuppressWarnings("unchecked")
-    public void readFrom(@NonNull Queue<Object> savedObjects) throws Exception {
+    public void readFrom(@NonNull final Queue<Object> savedObjects) throws Exception {
         super.readFrom(savedObjects);
         currentInfo = (I) savedObjects.poll();
         currentNextPageUrl = (String) savedObjects.poll();
@@ -95,10 +96,14 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
     //////////////////////////////////////////////////////////////////////////*/
 
     protected void doInitialLoadLogic() {
-        if (DEBUG) Log.d(TAG, "doInitialLoadLogic() called");
+        if (DEBUG) {
+            Log.d(TAG, "doInitialLoadLogic() called");
+        }
         if (currentInfo == null) {
             startLoading(false);
-        } else handleResult(currentInfo);
+        } else {
+            handleResult(currentInfo);
+        }
     }
 
     /**
@@ -106,18 +111,21 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
      * You can use the default implementations from {@link org.schabi.newpipe.util.ExtractorHelper}.
      *
      * @param forceLoad allow or disallow the result to come from the cache
+     * @return Rx {@link Single} containing the {@link ListInfo}
      */
     protected abstract Single<I> loadResult(boolean forceLoad);
 
     @Override
-    public void startLoading(boolean forceLoad) {
+    public void startLoading(final boolean forceLoad) {
         super.startLoading(forceLoad);
 
         showListFooter(false);
         infoListAdapter.clearStreamItemList();
 
         currentInfo = null;
-        if (currentWorker != null) currentWorker.dispose();
+        if (currentWorker != null) {
+            currentWorker.dispose();
+        }
         currentWorker = loadResult(forceLoad)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
@@ -130,15 +138,20 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
     }
 
     /**
-     * Implement the logic to load more items<br/>
-     * You can use the default implementations from {@link org.schabi.newpipe.util.ExtractorHelper}
+     * Implement the logic to load more items.
+     * <p>You can use the default implementations
+     * from {@link org.schabi.newpipe.util.ExtractorHelper}.</p>
+     *
+     * @return Rx {@link Single} containing the {@link ListExtractor.InfoItemsPage}
      */
     protected abstract Single<ListExtractor.InfoItemsPage> loadMoreItemsLogic();
 
     protected void loadMoreItems() {
         isLoading.set(true);
 
-        if (currentWorker != null) currentWorker.dispose();
+        if (currentWorker != null) {
+            currentWorker.dispose();
+        }
 
         forbidDownwardFocusScroll();
 
@@ -146,7 +159,8 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .doFinally(this::allowDownwardFocusScroll)
-                .subscribe((@io.reactivex.annotations.NonNull ListExtractor.InfoItemsPage InfoItemsPage) -> {
+                .subscribe((@io.reactivex.annotations.NonNull
+                                    ListExtractor.InfoItemsPage InfoItemsPage) -> {
                     isLoading.set(false);
                     handleNextItems(InfoItemsPage);
                 }, (@io.reactivex.annotations.NonNull Throwable throwable) -> {
@@ -168,7 +182,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
     }
 
     @Override
-    public void handleNextItems(ListExtractor.InfoItemsPage result) {
+    public void handleNextItems(final ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
         currentNextPageUrl = result.getNextPageUrl();
         infoListAdapter.addInfoItemList(result.getItems());
@@ -186,7 +200,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void handleResult(@NonNull I result) {
+    public void handleResult(@NonNull final I result) {
         super.handleResult(result);
 
         name = result.getName();
@@ -207,9 +221,9 @@ public abstract class BaseListInfoFragment<I extends ListInfo>
     // Utils
     //////////////////////////////////////////////////////////////////////////*/
 
-    protected void setInitialData(int serviceId, String url, String name) {
-        this.serviceId = serviceId;
-        this.url = url;
-        this.name = !TextUtils.isEmpty(name) ? name : "";
+    protected void setInitialData(final int sid, final String u, final String title) {
+        this.serviceId = sid;
+        this.url = u;
+        this.name = !TextUtils.isEmpty(title) ? title : "";
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelFragment.java

@@ -4,10 +4,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.core.content.ContextCompat;
-import androidx.appcompat.app.ActionBar;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.LayoutInflater;
@@ -21,6 +17,11 @@ import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.ActionBar;
+import androidx.core.content.ContextCompat;
+
 import com.jakewharton.rxbinding2.view.RxView;
 
 import org.schabi.newpipe.R;
@@ -29,7 +30,6 @@ import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.channel.ChannelInfo;
-import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.fragments.list.BaseListInfoFragment;
@@ -63,15 +63,15 @@ import static org.schabi.newpipe.util.AnimationUtils.animateTextColor;
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
 public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
-
+    private static final int BUTTON_DEBOUNCE_INTERVAL = 100;
     private final CompositeDisposable disposables = new CompositeDisposable();
     private Disposable subscribeButtonMonitor;
-    private SubscriptionManager subscriptionManager;
 
     /*//////////////////////////////////////////////////////////////////////////
     // Views
     //////////////////////////////////////////////////////////////////////////*/
 
+    private SubscriptionManager subscriptionManager;
     private View headerRootLayout;
     private ImageView headerChannelBanner;
     private ImageView headerAvatarView;
@@ -79,25 +79,20 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     private TextView headerSubscribersTextView;
     private Button headerSubscribeButton;
     private View playlistCtrl;
-
     private LinearLayout headerPlayAllButton;
     private LinearLayout headerPopupButton;
     private LinearLayout headerBackgroundButton;
-
     private MenuItem menuRssButton;
 
-    public static ChannelFragment getInstance(int serviceId, String url, String name) {
+    public static ChannelFragment getInstance(final int serviceId, final String url,
+                                              final String name) {
         ChannelFragment instance = new ChannelFragment();
         instance.setInitialData(serviceId, url, name);
         return instance;
     }
 
-    /*//////////////////////////////////////////////////////////////////////////
-    // LifeCycle
-    //////////////////////////////////////////////////////////////////////////*/
-
     @Override
-    public void setUserVisibleHint(boolean isVisibleToUser) {
+    public void setUserVisibleHint(final boolean isVisibleToUser) {
         super.setUserVisibleHint(isVisibleToUser);
         if (activity != null
                 && useAsFrontPage
@@ -106,22 +101,32 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
         }
     }
 
+    /*//////////////////////////////////////////////////////////////////////////
+    // LifeCycle
+    //////////////////////////////////////////////////////////////////////////*/
+
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(final Context context) {
         super.onAttach(context);
         subscriptionManager = new SubscriptionManager(activity);
     }
 
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+    public View onCreateView(@NonNull final LayoutInflater inflater,
+                             @Nullable final ViewGroup container,
+                             @Nullable final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_channel, container, false);
     }
 
     @Override
     public void onDestroy() {
         super.onDestroy();
-        if (disposables != null) disposables.clear();
-        if (subscribeButtonMonitor != null) subscribeButtonMonitor.dispose();
+        if (disposables != null) {
+            disposables.clear();
+        }
+        if (subscribeButtonMonitor != null) {
+            subscribeButtonMonitor.dispose();
+        }
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -129,7 +134,8 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     protected View getListHeader() {
-        headerRootLayout = activity.getLayoutInflater().inflate(R.layout.channel_header, itemsList, false);
+        headerRootLayout = activity.getLayoutInflater()
+                .inflate(R.layout.channel_header, itemsList, false);
         headerChannelBanner = headerRootLayout.findViewById(R.id.channel_banner_image);
         headerAvatarView = headerRootLayout.findViewById(R.id.channel_avatar_view);
         headerTitleView = headerRootLayout.findViewById(R.id.channel_title_view);
@@ -150,7 +156,7 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);
         ActionBar supportActionBar = activity.getSupportActionBar();
         if (useAsFrontPage && supportActionBar != null) {
@@ -158,8 +164,10 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
         } else {
             inflater.inflate(R.menu.menu_channel, menu);
 
-            if (DEBUG) Log.d(TAG, "onCreateOptionsMenu() called with: menu = [" + menu +
-                    "], inflater = [" + inflater + "]");
+            if (DEBUG) {
+                Log.d(TAG, "onCreateOptionsMenu() called with: "
+                        + "menu = [" + menu + "], inflater = [" + inflater + "]");
+            }
             menuRssButton = menu.findItem(R.id.menu_item_rss);
         }
     }
@@ -173,7 +181,7 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     }
 
     @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
+    public boolean onOptionsItemSelected(final MenuItem item) {
         switch (item.getItemId()) {
             case R.id.action_settings:
                 NavigationHelper.openSettings(requireContext());
@@ -201,18 +209,16 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     // Channel Subscription
     //////////////////////////////////////////////////////////////////////////*/
 
-    private static final int BUTTON_DEBOUNCE_INTERVAL = 100;
-
     private void monitorSubscription(final ChannelInfo info) {
         final Consumer<Throwable> onError = (Throwable throwable) -> {
-                animateView(headerSubscribeButton, false, 100);
-                showSnackBarError(throwable, UserAction.SUBSCRIPTION,
-                        NewPipe.getNameOfService(currentInfo.getServiceId()),
-                        "Get subscription status",
-                        0);
+            animateView(headerSubscribeButton, false, 100);
+            showSnackBarError(throwable, UserAction.SUBSCRIPTION,
+                    NewPipe.getNameOfService(currentInfo.getServiceId()),
+                    "Get subscription status", 0);
         };
 
-        final Observable<List<SubscriptionEntity>> observable = subscriptionManager.subscriptionTable()
+        final Observable<List<SubscriptionEntity>> observable = subscriptionManager
+                .subscriptionTable()
                 .getSubscriptionFlowable(info.getServiceId(), info.getUrl())
                 .toObservable();
 
@@ -221,17 +227,19 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
                 .subscribe(getSubscribeUpdateMonitor(info), onError));
 
         disposables.add(observable
-                // Some updates are very rapid (when calling the updateSubscription(info), for example)
-                // so only update the UI for the latest emission ("sync" the subscribe button's state)
+                // Some updates are very rapid
+                // (for example when calling the updateSubscription(info))
+                // so only update the UI for the latest emission
+                // ("sync" the subscribe button's state)
                 .debounce(100, TimeUnit.MILLISECONDS)
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe((List<SubscriptionEntity> subscriptionEntities) ->
-                                updateSubscribeButton(!subscriptionEntities.isEmpty())
-                        , onError));
+                                updateSubscribeButton(!subscriptionEntities.isEmpty()), onError));
 
     }
 
-    private Function<Object, Object> mapOnSubscribe(final SubscriptionEntity subscription, ChannelInfo info) {
+    private Function<Object, Object> mapOnSubscribe(final SubscriptionEntity subscription,
+                                                    final ChannelInfo info) {
         return (@NonNull Object o) -> {
             subscriptionManager.insertSubscription(subscription, info);
             return o;
@@ -246,9 +254,13 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     }
 
     private void updateSubscription(final ChannelInfo info) {
-        if (DEBUG) Log.d(TAG, "updateSubscription() called with: info = [" + info + "]");
+        if (DEBUG) {
+            Log.d(TAG, "updateSubscription() called with: info = [" + info + "]");
+        }
         final Action onComplete = () -> {
-                if (DEBUG) Log.d(TAG, "Updated subscription: " + info.getUrl());
+            if (DEBUG) {
+                Log.d(TAG, "Updated subscription: " + info.getUrl());
+            }
         };
 
         final Consumer<Throwable> onError = (@NonNull Throwable throwable) ->
@@ -264,9 +276,12 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
                 .subscribe(onComplete, onError));
     }
 
-    private Disposable monitorSubscribeButton(final Button subscribeButton, final Function<Object, Object> action) {
+    private Disposable monitorSubscribeButton(final Button subscribeButton,
+                                              final Function<Object, Object> action) {
         final Consumer<Object> onNext = (@NonNull Object o) -> {
-                if (DEBUG) Log.d(TAG, "Changed subscription status to this channel!");
+            if (DEBUG) {
+                Log.d(TAG, "Changed subscription status to this channel!");
+            }
         };
 
         final Consumer<Throwable> onError = (@NonNull Throwable throwable) ->
@@ -287,12 +302,18 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
 
     private Consumer<List<SubscriptionEntity>> getSubscribeUpdateMonitor(final ChannelInfo info) {
         return (List<SubscriptionEntity> subscriptionEntities) -> {
-            if (DEBUG)
-                Log.d(TAG, "subscriptionManager.subscriptionTable.doOnNext() called with: subscriptionEntities = [" + subscriptionEntities + "]");
-            if (subscribeButtonMonitor != null) subscribeButtonMonitor.dispose();
+            if (DEBUG) {
+                Log.d(TAG, "subscriptionManager.subscriptionTable.doOnNext() called with: "
+                        + "subscriptionEntities = [" + subscriptionEntities + "]");
+            }
+            if (subscribeButtonMonitor != null) {
+                subscribeButtonMonitor.dispose();
+            }
 
             if (subscriptionEntities.isEmpty()) {
-                if (DEBUG) Log.d(TAG, "No subscription to this channel!");
+                if (DEBUG) {
+                    Log.d(TAG, "No subscription to this channel!");
+                }
                 SubscriptionEntity channel = new SubscriptionEntity();
                 channel.setServiceId(info.getServiceId());
                 channel.setUrl(info.getUrl());
@@ -300,34 +321,45 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
                         info.getAvatarUrl(),
                         info.getDescription(),
                         info.getSubscriberCount());
-                subscribeButtonMonitor = monitorSubscribeButton(headerSubscribeButton, mapOnSubscribe(channel, info));
+                subscribeButtonMonitor = monitorSubscribeButton(headerSubscribeButton,
+                        mapOnSubscribe(channel, info));
             } else {
-                if (DEBUG) Log.d(TAG, "Found subscription to this channel!");
+                if (DEBUG) {
+                    Log.d(TAG, "Found subscription to this channel!");
+                }
                 final SubscriptionEntity subscription = subscriptionEntities.get(0);
-                subscribeButtonMonitor = monitorSubscribeButton(headerSubscribeButton, mapOnUnsubscribe(subscription));
+                subscribeButtonMonitor = monitorSubscribeButton(headerSubscribeButton,
+                        mapOnUnsubscribe(subscription));
             }
         };
     }
 
-    private void updateSubscribeButton(boolean isSubscribed) {
-        if (DEBUG) Log.d(TAG, "updateSubscribeButton() called with: isSubscribed = [" + isSubscribed + "]");
+    private void updateSubscribeButton(final boolean isSubscribed) {
+        if (DEBUG) {
+            Log.d(TAG, "updateSubscribeButton() called with: "
+                    + "isSubscribed = [" + isSubscribed + "]");
+        }
 
         boolean isButtonVisible = headerSubscribeButton.getVisibility() == View.VISIBLE;
         int backgroundDuration = isButtonVisible ? 300 : 0;
         int textDuration = isButtonVisible ? 200 : 0;
 
-        int subscribeBackground = ContextCompat.getColor(activity, R.color.subscribe_background_color);
+        int subscribeBackground = ContextCompat
+                .getColor(activity, R.color.subscribe_background_color);
         int subscribeText = ContextCompat.getColor(activity, R.color.subscribe_text_color);
-        int subscribedBackground = ContextCompat.getColor(activity, R.color.subscribed_background_color);
+        int subscribedBackground = ContextCompat
+                .getColor(activity, R.color.subscribed_background_color);
         int subscribedText = ContextCompat.getColor(activity, R.color.subscribed_text_color);
 
         if (!isSubscribed) {
             headerSubscribeButton.setText(R.string.subscribe_button_title);
-            animateBackgroundColor(headerSubscribeButton, backgroundDuration, subscribedBackground, subscribeBackground);
+            animateBackgroundColor(headerSubscribeButton, backgroundDuration, subscribedBackground,
+                    subscribeBackground);
             animateTextColor(headerSubscribeButton, textDuration, subscribedText, subscribeText);
         } else {
             headerSubscribeButton.setText(R.string.subscribed_button_title);
-            animateBackgroundColor(headerSubscribeButton, backgroundDuration, subscribeBackground, subscribedBackground);
+            animateBackgroundColor(headerSubscribeButton, backgroundDuration, subscribeBackground,
+                    subscribedBackground);
             animateTextColor(headerSubscribeButton, textDuration, subscribeText, subscribedText);
         }
 
@@ -344,7 +376,7 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     }
 
     @Override
-    protected Single<ChannelInfo> loadResult(boolean forceLoad) {
+    protected Single<ChannelInfo> loadResult(final boolean forceLoad) {
         return ExtractorHelper.getChannelInfo(serviceId, url, forceLoad);
     }
 
@@ -356,47 +388,55 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     public void showLoading() {
         super.showLoading();
 
-        imageLoader.cancelDisplayTask(headerChannelBanner);
-        imageLoader.cancelDisplayTask(headerAvatarView);
+        IMAGE_LOADER.cancelDisplayTask(headerChannelBanner);
+        IMAGE_LOADER.cancelDisplayTask(headerAvatarView);
         animateView(headerSubscribeButton, false, 100);
     }
 
     @Override
-    public void handleResult(@NonNull ChannelInfo result) {
+    public void handleResult(@NonNull final ChannelInfo result) {
         super.handleResult(result);
 
         headerRootLayout.setVisibility(View.VISIBLE);
-        imageLoader.displayImage(result.getBannerUrl(), headerChannelBanner,
+        IMAGE_LOADER.displayImage(result.getBannerUrl(), headerChannelBanner,
                 ImageDisplayConstants.DISPLAY_BANNER_OPTIONS);
-        imageLoader.displayImage(result.getAvatarUrl(), headerAvatarView,
+        IMAGE_LOADER.displayImage(result.getAvatarUrl(), headerAvatarView,
                 ImageDisplayConstants.DISPLAY_AVATAR_OPTIONS);
 
         headerSubscribersTextView.setVisibility(View.VISIBLE);
         if (result.getSubscriberCount() >= 0) {
-            headerSubscribersTextView.setText(Localization.shortSubscriberCount(activity, result.getSubscriberCount()));
+            headerSubscribersTextView.setText(Localization
+                    .shortSubscriberCount(activity, result.getSubscriberCount()));
         } else {
             headerSubscribersTextView.setText(R.string.subscribers_count_not_available);
         }
 
-        if (menuRssButton != null) menuRssButton.setVisible(!TextUtils.isEmpty(result.getFeedUrl()));
+        if (menuRssButton != null) {
+            menuRssButton.setVisible(!TextUtils.isEmpty(result.getFeedUrl()));
+        }
 
         playlistCtrl.setVisibility(View.VISIBLE);
 
         if (!result.getErrors().isEmpty()) {
-            showSnackBarError(result.getErrors(), UserAction.REQUESTED_CHANNEL, NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
+            showSnackBarError(result.getErrors(), UserAction.REQUESTED_CHANNEL,
+                    NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
         }
 
-        if (disposables != null) disposables.clear();
-        if (subscribeButtonMonitor != null) subscribeButtonMonitor.dispose();
+        if (disposables != null) {
+            disposables.clear();
+        }
+        if (subscribeButtonMonitor != null) {
+            subscribeButtonMonitor.dispose();
+        }
         updateSubscription(result);
         monitorSubscription(result);
 
-        headerPlayAllButton.setOnClickListener(
-                view -> NavigationHelper.playOnMainPlayer(activity, getPlayQueue(), false));
-        headerPopupButton.setOnClickListener(
-                view -> NavigationHelper.playOnPopupPlayer(activity, getPlayQueue(), false));
-        headerBackgroundButton.setOnClickListener(
-                view -> NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue(), false));
+        headerPlayAllButton.setOnClickListener(view -> NavigationHelper
+                .playOnMainPlayer(activity, getPlayQueue(), false));
+        headerPopupButton.setOnClickListener(view -> NavigationHelper
+                .playOnPopupPlayer(activity, getPlayQueue(), false));
+        headerBackgroundButton.setOnClickListener(view -> NavigationHelper
+                .playOnBackgroundPlayer(activity, getPlayQueue(), false));
     }
 
     private PlayQueue getPlayQueue() {
@@ -410,17 +450,12 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
                 streamItems.add((StreamInfoItem) i);
             }
         }
-        return new ChannelPlayQueue(
-                currentInfo.getServiceId(),
-                currentInfo.getUrl(),
-                currentInfo.getNextPageUrl(),
-                streamItems,
-                index
-        );
+        return new ChannelPlayQueue(currentInfo.getServiceId(), currentInfo.getUrl(),
+                currentInfo.getNextPageUrl(), streamItems, index);
     }
 
     @Override
-    public void handleNextItems(ListExtractor.InfoItemsPage result) {
+    public void handleNextItems(final ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
 
         if (!result.getErrors().isEmpty()) {
@@ -437,8 +472,10 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected boolean onError(Throwable exception) {
-        if (super.onError(exception)) return true;
+    protected boolean onError(final Throwable exception) {
+        if (super.onError(exception)) {
+            return true;
+        }
 
         int errorId = exception instanceof ExtractionException
                 ? R.string.parsing_error : R.string.general_error;
@@ -454,8 +491,10 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void setTitle(String title) {
+    public void setTitle(final String title) {
         super.setTitle(title);
-        if (!useAsFrontPage) headerTitleView.setText(title);
+        if (!useAsFrontPage) {
+            headerTitleView.setText(title);
+        }
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/comments/CommentsFragment.java

@@ -2,14 +2,15 @@ package org.schabi.newpipe.fragments.list.comments;
 
 import android.content.Context;
 import android.os.Bundle;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.NewPipe;
@@ -23,17 +24,12 @@ import io.reactivex.Single;
 import io.reactivex.disposables.CompositeDisposable;
 
 public class CommentsFragment extends BaseListInfoFragment<CommentsInfo> {
-
     private CompositeDisposable disposables = new CompositeDisposable();
-    /*//////////////////////////////////////////////////////////////////////////
-    // Views
-    //////////////////////////////////////////////////////////////////////////*/
-
-
 
     private boolean mIsVisibleToUser = false;
 
-    public static CommentsFragment getInstance(int serviceId, String url, String name) {
+    public static CommentsFragment getInstance(final int serviceId, final  String url,
+                                               final String name) {
         CommentsFragment instance = new CommentsFragment();
         instance.setInitialData(serviceId, url, name);
         return instance;
@@ -44,28 +40,31 @@ public class CommentsFragment extends BaseListInfoFragment<CommentsInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void setUserVisibleHint(boolean isVisibleToUser) {
+    public void setUserVisibleHint(final boolean isVisibleToUser) {
         super.setUserVisibleHint(isVisibleToUser);
         mIsVisibleToUser = isVisibleToUser;
     }
 
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(final Context context) {
         super.onAttach(context);
     }
 
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+    public View onCreateView(@NonNull final LayoutInflater inflater,
+                             @Nullable final ViewGroup container,
+                             @Nullable final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_comments, container, false);
     }
 
     @Override
     public void onDestroy() {
         super.onDestroy();
-        if (disposables != null) disposables.clear();
+        if (disposables != null) {
+            disposables.clear();
+        }
     }
 
-
     /*//////////////////////////////////////////////////////////////////////////
     // Load and handle
     //////////////////////////////////////////////////////////////////////////*/
@@ -76,7 +75,7 @@ public class CommentsFragment extends BaseListInfoFragment<CommentsInfo> {
     }
 
     @Override
-    protected Single<CommentsInfo> loadResult(boolean forceLoad) {
+    protected Single<CommentsInfo> loadResult(final boolean forceLoad) {
         return ExtractorHelper.getCommentsInfo(serviceId, url, forceLoad);
     }
 
@@ -90,27 +89,28 @@ public class CommentsFragment extends BaseListInfoFragment<CommentsInfo> {
     }
 
     @Override
-    public void handleResult(@NonNull CommentsInfo result) {
+    public void handleResult(@NonNull final CommentsInfo result) {
         super.handleResult(result);
 
-        AnimationUtils.slideUp(getView(),120, 150, 0.06f);
+        AnimationUtils.slideUp(getView(), 120, 150, 0.06f);
 
         if (!result.getErrors().isEmpty()) {
-            showSnackBarError(result.getErrors(), UserAction.REQUESTED_COMMENTS, NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
+            showSnackBarError(result.getErrors(), UserAction.REQUESTED_COMMENTS,
+                    NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
         }
 
-        if (disposables != null) disposables.clear();
+        if (disposables != null) {
+            disposables.clear();
+        }
     }
 
     @Override
-    public void handleNextItems(ListExtractor.InfoItemsPage result) {
+    public void handleNextItems(final ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
 
         if (!result.getErrors().isEmpty()) {
-            showSnackBarError(result.getErrors(),
-                    UserAction.REQUESTED_COMMENTS,
-                    NewPipe.getNameOfService(serviceId),
-                    "Get next page of: " + url,
+            showSnackBarError(result.getErrors(), UserAction.REQUESTED_COMMENTS,
+                    NewPipe.getNameOfService(serviceId), "Get next page of: " + url,
                     R.string.general_error);
         }
     }
@@ -120,11 +120,14 @@ public class CommentsFragment extends BaseListInfoFragment<CommentsInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected boolean onError(Throwable exception) {
-        if (super.onError(exception)) return true;
+    protected boolean onError(final Throwable exception) {
+        if (super.onError(exception)) {
+            return true;
+        }
 
         hideLoading();
-        showSnackBarError(exception, UserAction.REQUESTED_COMMENTS, NewPipe.getNameOfService(serviceId), url, R.string.error_unable_to_load_comments);
+        showSnackBarError(exception, UserAction.REQUESTED_COMMENTS,
+                NewPipe.getNameOfService(serviceId), url, R.string.error_unable_to_load_comments);
         return true;
     }
 
@@ -133,14 +136,10 @@ public class CommentsFragment extends BaseListInfoFragment<CommentsInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void setTitle(String title) {
-        return;
-    }
+    public void setTitle(final String title) { }
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
-        return;
-    }
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { }
 
     @Override
     protected boolean isGridLayout() {

app/src/main/java/org/schabi/newpipe/fragments/list/kiosk/DefaultKioskFragment.java

@@ -10,9 +10,8 @@ import org.schabi.newpipe.util.KioskTranslator;
 import org.schabi.newpipe.util.ServiceHelper;
 
 public class DefaultKioskFragment extends KioskFragment {
-
     @Override
-    public void onCreate(Bundle savedInstanceState) {
+    public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         if (serviceId < 0) {
@@ -25,7 +24,9 @@ public class DefaultKioskFragment extends KioskFragment {
         super.onResume();
 
         if (serviceId != ServiceHelper.getSelectedServiceId(requireContext())) {
-            if (currentWorker != null) currentWorker.dispose();
+            if (currentWorker != null) {
+                currentWorker.dispose();
+            }
             updateSelectedDefaultKiosk();
             reloadContent();
         }
@@ -45,7 +46,8 @@ public class DefaultKioskFragment extends KioskFragment {
             currentInfo = null;
             currentNextPageUrl = null;
         } catch (ExtractionException e) {
-            onUnrecoverableError(e, UserAction.REQUESTED_KIOSK, "none", "Loading default kiosk from selected service", 0);
+            onUnrecoverableError(e, UserAction.REQUESTED_KIOSK, "none",
+                    "Loading default kiosk from selected service", 0);
         }
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/kiosk/KioskFragment.java

@@ -1,17 +1,16 @@
 package org.schabi.newpipe.fragments.list.kiosk;
 
 import android.os.Bundle;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.appcompat.app.ActionBar;
-
-import android.preference.PreferenceManager;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.ActionBar;
+
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.NewPipe;
@@ -33,45 +32,45 @@ import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
 /**
  * Created by Christian Schabesberger on 23.09.17.
- *
+ * <p>
  * Copyright (C) Christian Schabesberger 2017 <chris.schabesberger@mailbox.org>
  * KioskFragment.java is part of NewPipe.
- *
+ * </p>
+ * <p>
  * NewPipe is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
- *
+ * </p>
+ * <p>
  * NewPipe is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
+ * </p>
+ * <p>
  * You should have received a copy of the GNU General Public License
- * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
+ * along with NewPipe. If not, see <http://www.gnu.org/licenses/>.
+ * </p>
  */
 
 public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
-
     @State
-    protected String kioskId = "";
-    protected String kioskTranslatedName;
+    String kioskId = "";
+    String kioskTranslatedName;
     @State
-    protected ContentCountry contentCountry;
-
+    ContentCountry contentCountry;
 
     /*//////////////////////////////////////////////////////////////////////////
     // Views
     //////////////////////////////////////////////////////////////////////////*/
 
-    public static KioskFragment getInstance(int serviceId)
-            throws ExtractionException {
+    public static KioskFragment getInstance(final int serviceId) throws ExtractionException {
         return getInstance(serviceId, NewPipe.getService(serviceId)
-                .getKioskList()
-                .getDefaultKioskId());
+                .getKioskList().getDefaultKioskId());
     }
 
-    public static KioskFragment getInstance(int serviceId, String kioskId)
+    public static KioskFragment getInstance(final int serviceId, final String kioskId)
             throws ExtractionException {
         KioskFragment instance = new KioskFragment();
         StreamingService service = NewPipe.getService(serviceId);
@@ -88,7 +87,7 @@ public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
+    public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         kioskTranslatedName = KioskTranslator.getTranslatedKioskName(kioskId, activity);
@@ -97,9 +96,9 @@ public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
     }
 
     @Override
-    public void setUserVisibleHint(boolean isVisibleToUser) {
+    public void setUserVisibleHint(final boolean isVisibleToUser) {
         super.setUserVisibleHint(isVisibleToUser);
-        if(useAsFrontPage && isVisibleToUser && activity != null) {
+        if (useAsFrontPage && isVisibleToUser && activity != null) {
             try {
                 setTitle(kioskTranslatedName);
             } catch (Exception e) {
@@ -111,7 +110,9 @@ public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
     }
 
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+    public View onCreateView(@NonNull final LayoutInflater inflater,
+                             @Nullable final ViewGroup container,
+                             @Nullable final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_kiosk, container, false);
     }
 
@@ -129,7 +130,7 @@ public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);
         ActionBar supportActionBar = activity.getSupportActionBar();
         if (supportActionBar != null && useAsFrontPage) {
@@ -142,18 +143,14 @@ public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public Single<KioskInfo> loadResult(boolean forceReload) {
+    public Single<KioskInfo> loadResult(final boolean forceReload) {
         contentCountry = Localization.getPreferredContentCountry(requireContext());
-        return ExtractorHelper.getKioskInfo(serviceId,
-                url,
-                forceReload);
+        return ExtractorHelper.getKioskInfo(serviceId, url, forceReload);
     }
 
     @Override
     public Single<ListExtractor.InfoItemsPage> loadMoreItemsLogic() {
-        return ExtractorHelper.getMoreKioskItems(serviceId,
-                url,
-                currentNextPageUrl);
+        return ExtractorHelper.getMoreKioskItems(serviceId, url, currentNextPageUrl);
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -181,13 +178,13 @@ public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
     }
 
     @Override
-    public void handleNextItems(ListExtractor.InfoItemsPage result) {
+    public void handleNextItems(final ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
 
         if (!result.getErrors().isEmpty()) {
             showSnackBarError(result.getErrors(),
-                    UserAction.REQUESTED_PLAYLIST, NewPipe.getNameOfService(serviceId)
-                    , "Get next page of: " + url, 0);
+                    UserAction.REQUESTED_PLAYLIST, NewPipe.getNameOfService(serviceId),
+                    "Get next page of: " + url, 0);
         }
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/playlist/PlaylistFragment.java

@@ -3,9 +3,6 @@ package org.schabi.newpipe.fragments.list.playlist;
 import android.app.Activity;
 import android.content.Context;
 import android.os.Bundle;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.appcompat.app.AppCompatActivity;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.LayoutInflater;
@@ -17,6 +14,10 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
 import org.reactivestreams.Subscriber;
 import org.reactivestreams.Subscription;
 import org.schabi.newpipe.NewPipeDatabase;
@@ -57,7 +58,6 @@ import io.reactivex.disposables.Disposables;
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
 public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
-
     private CompositeDisposable disposables;
     private Subscription bookmarkReactor;
     private AtomicBoolean isBookmarkButtonReady;
@@ -82,7 +82,8 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
 
     private MenuItem playlistBookmarkButton;
 
-    public static PlaylistFragment getInstance(int serviceId, String url, String name) {
+    public static PlaylistFragment getInstance(final int serviceId, final String url,
+                                               final String name) {
         PlaylistFragment instance = new PlaylistFragment();
         instance.setInitialData(serviceId, url, name);
         return instance;
@@ -93,17 +94,18 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
+    public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         disposables = new CompositeDisposable();
         isBookmarkButtonReady = new AtomicBoolean(false);
-        remotePlaylistManager = new RemotePlaylistManager(NewPipeDatabase.getInstance(
-                requireContext()));
+        remotePlaylistManager = new RemotePlaylistManager(NewPipeDatabase
+                .getInstance(requireContext()));
     }
 
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
-                             @Nullable Bundle savedInstanceState) {
+    public View onCreateView(@NonNull final LayoutInflater inflater,
+                             @Nullable final ViewGroup container,
+                             @Nullable final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_playlist, container, false);
     }
 
@@ -112,7 +114,8 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     protected View getListHeader() {
-        headerRootLayout = activity.getLayoutInflater().inflate(R.layout.playlist_header, itemsList, false);
+        headerRootLayout = activity.getLayoutInflater()
+                .inflate(R.layout.playlist_header, itemsList, false);
         headerTitleView = headerRootLayout.findViewById(R.id.playlist_title_view);
         headerUploaderLayout = headerRootLayout.findViewById(R.id.uploader_layout);
         headerUploaderName = headerRootLayout.findViewById(R.id.uploader_name);
@@ -129,21 +132,23 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     }
 
     @Override
-    protected void initViews(View rootView, Bundle savedInstanceState) {
+    protected void initViews(final View rootView, final Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
 
-        infoListAdapter.useMiniItemVariants(true);
+        infoListAdapter.setUseMiniVariant(true);
     }
 
-    private PlayQueue getPlayQueueStartingAt(StreamInfoItem infoItem) {
+    private PlayQueue getPlayQueueStartingAt(final StreamInfoItem infoItem) {
         return getPlayQueue(Math.max(infoListAdapter.getItemsList().indexOf(infoItem), 0));
     }
 
     @Override
-    protected void showStreamDialog(StreamInfoItem item) {
+    protected void showStreamDialog(final StreamInfoItem item) {
         final Context context = getContext();
         final Activity activity = getActivity();
-        if (context == null || context.getResources() == null || activity == null) return;
+        if (context == null || context.getResources() == null || activity == null) {
+            return;
+        }
 
         if (item.getStreamType() == StreamType.AUDIO_STREAM) {
             StreamDialogEntry.setEnabledEntries(
@@ -160,21 +165,25 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
                     StreamDialogEntry.append_playlist,
                     StreamDialogEntry.share);
 
-            StreamDialogEntry.start_here_on_popup.setCustomAction(
-                    (fragment, infoItem) -> NavigationHelper.playOnPopupPlayer(context, getPlayQueueStartingAt(infoItem), true));
+            StreamDialogEntry.start_here_on_popup.setCustomAction((fragment, infoItem) ->
+                    NavigationHelper.playOnPopupPlayer(context,
+                            getPlayQueueStartingAt(infoItem), true));
         }
 
-        StreamDialogEntry.start_here_on_background.setCustomAction(
-                (fragment, infoItem) -> NavigationHelper.playOnBackgroundPlayer(context, getPlayQueueStartingAt(infoItem), true));
+        StreamDialogEntry.start_here_on_background.setCustomAction((fragment, infoItem) ->
+                NavigationHelper.playOnBackgroundPlayer(context,
+                        getPlayQueueStartingAt(infoItem), true));
 
-        new InfoItemDialog(activity, item, StreamDialogEntry.getCommands(context), (dialog, which) ->
-                StreamDialogEntry.clickOn(which, this, item)).show();
+        new InfoItemDialog(activity, item, StreamDialogEntry.getCommands(context),
+                (dialog, which) -> StreamDialogEntry.clickOn(which, this, item)).show();
     }
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
-        if (DEBUG) Log.d(TAG, "onCreateOptionsMenu() called with: menu = [" + menu +
-                "], inflater = [" + inflater + "]");
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
+        if (DEBUG) {
+            Log.d(TAG, "onCreateOptionsMenu() called with: "
+                    + "menu = [" + menu + "], inflater = [" + inflater + "]");
+        }
         super.onCreateOptionsMenu(menu, inflater);
         inflater.inflate(R.menu.menu_playlist, menu);
 
@@ -185,10 +194,16 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     @Override
     public void onDestroyView() {
         super.onDestroyView();
-        if (isBookmarkButtonReady != null) isBookmarkButtonReady.set(false);
+        if (isBookmarkButtonReady != null) {
+            isBookmarkButtonReady.set(false);
+        }
 
-        if (disposables != null) disposables.clear();
-        if (bookmarkReactor != null) bookmarkReactor.cancel();
+        if (disposables != null) {
+            disposables.clear();
+        }
+        if (bookmarkReactor != null) {
+            bookmarkReactor.cancel();
+        }
 
         bookmarkReactor = null;
     }
@@ -197,7 +212,9 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     public void onDestroy() {
         super.onDestroy();
 
-        if (disposables != null) disposables.dispose();
+        if (disposables != null) {
+            disposables.dispose();
+        }
 
         disposables = null;
         remotePlaylistManager = null;
@@ -215,12 +232,12 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     }
 
     @Override
-    protected Single<PlaylistInfo> loadResult(boolean forceLoad) {
+    protected Single<PlaylistInfo> loadResult(final boolean forceLoad) {
         return ExtractorHelper.getPlaylistInfo(serviceId, url, forceLoad);
     }
 
     @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
+    public boolean onOptionsItemSelected(final MenuItem item) {
         switch (item.getItemId()) {
             case R.id.action_settings:
                 NavigationHelper.openSettings(requireContext());
@@ -251,7 +268,7 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
         animateView(headerRootLayout, false, 200);
         animateView(itemsList, false, 100);
 
-        imageLoader.cancelDisplayTask(headerUploaderAvatar);
+        IMAGE_LOADER.cancelDisplayTask(headerUploaderAvatar);
         animateView(headerUploaderLayout, false, 200);
     }
 
@@ -262,7 +279,8 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
         animateView(headerRootLayout, true, 100);
         animateView(headerUploaderLayout, true, 300);
         headerUploaderLayout.setOnClickListener(null);
-        if (!TextUtils.isEmpty(result.getUploaderName())) { // If we have an uploader : Put them into the ui
+        // If we have an uploader put them into the UI
+        if (!TextUtils.isEmpty(result.getUploaderName())) {
             headerUploaderName.setText(result.getUploaderName());
             if (!TextUtils.isEmpty(result.getUploaderUrl())) {
                 headerUploaderLayout.setOnClickListener(v -> {
@@ -276,19 +294,20 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
                     }
                 });
             }
-        } else { // Else : say we have no uploader
+        } else { // Otherwise say we have no uploader
             headerUploaderName.setText(R.string.playlist_no_uploader);
         }
 
         playlistCtrl.setVisibility(View.VISIBLE);
 
-        imageLoader.displayImage(result.getUploaderAvatarUrl(), headerUploaderAvatar,
+        IMAGE_LOADER.displayImage(result.getUploaderAvatarUrl(), headerUploaderAvatar,
                 ImageDisplayConstants.DISPLAY_AVATAR_OPTIONS);
         headerStreamCount.setText(getResources().getQuantityString(R.plurals.videos,
                 (int) result.getStreamCount(), (int) result.getStreamCount()));
 
         if (!result.getErrors().isEmpty()) {
-            showSnackBarError(result.getErrors(), UserAction.REQUESTED_PLAYLIST, NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
+            showSnackBarError(result.getErrors(), UserAction.REQUESTED_PLAYLIST,
+                    NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
         }
 
         remotePlaylistManager.getPlaylist(result)
@@ -321,8 +340,8 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
 
     private PlayQueue getPlayQueue(final int index) {
         final List<StreamInfoItem> infoItems = new ArrayList<>();
-        for(InfoItem i : infoListAdapter.getItemsList()) {
-            if(i instanceof StreamInfoItem) {
+        for (InfoItem i : infoListAdapter.getItemsList()) {
+            if (i instanceof StreamInfoItem) {
                 infoItems.add((StreamInfoItem) i);
             }
         }
@@ -336,12 +355,12 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     }
 
     @Override
-    public void handleNextItems(ListExtractor.InfoItemsPage result) {
+    public void handleNextItems(final ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
 
         if (!result.getErrors().isEmpty()) {
-            showSnackBarError(result.getErrors(), UserAction.REQUESTED_PLAYLIST, NewPipe.getNameOfService(serviceId)
-                    , "Get next page of: " + url, 0);
+            showSnackBarError(result.getErrors(), UserAction.REQUESTED_PLAYLIST,
+                    NewPipe.getNameOfService(serviceId), "Get next page of: " + url, 0);
         }
     }
 
@@ -350,15 +369,15 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected boolean onError(Throwable exception) {
-        if (super.onError(exception)) return true;
+    protected boolean onError(final Throwable exception) {
+        if (super.onError(exception)) {
+            return true;
+        }
 
-        int errorId = exception instanceof ExtractionException ? R.string.parsing_error : R.string.general_error;
-        onUnrecoverableError(exception,
-                UserAction.REQUESTED_PLAYLIST,
-                NewPipe.getNameOfService(serviceId),
-                url,
-                errorId);
+        int errorId = exception instanceof ExtractionException
+                ? R.string.parsing_error : R.string.general_error;
+        onUnrecoverableError(exception, UserAction.REQUESTED_PLAYLIST,
+                NewPipe.getNameOfService(serviceId), url, errorId);
         return true;
     }
 
@@ -366,13 +385,18 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     // Utils
     //////////////////////////////////////////////////////////////////////////*/
 
-    private Flowable<Integer> getUpdateProcessor(@NonNull List<PlaylistRemoteEntity> playlists,
-                                                 @NonNull PlaylistInfo result) {
+    private Flowable<Integer> getUpdateProcessor(
+            @NonNull final List<PlaylistRemoteEntity> playlists,
+            @NonNull final PlaylistInfo result) {
         final Flowable<Integer> noItemToUpdate = Flowable.just(/*noItemToUpdate=*/-1);
-        if (playlists.isEmpty()) return noItemToUpdate;
+        if (playlists.isEmpty()) {
+            return noItemToUpdate;
+        }
 
-        final PlaylistRemoteEntity playlistEntity = playlists.get(0);
-        if (playlistEntity.isIdenticalTo(result)) return noItemToUpdate;
+        final PlaylistRemoteEntity playlistRemoteEntity = playlists.get(0);
+        if (playlistRemoteEntity.isIdenticalTo(result)) {
+            return noItemToUpdate;
+        }
 
         return remotePlaylistManager.onUpdate(playlists.get(0).getUid(), result).toFlowable();
     }
@@ -380,56 +404,59 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     private Subscriber<List<PlaylistRemoteEntity>> getPlaylistBookmarkSubscriber() {
         return new Subscriber<List<PlaylistRemoteEntity>>() {
             @Override
-            public void onSubscribe(Subscription s) {
-                if (bookmarkReactor != null) bookmarkReactor.cancel();
+            public void onSubscribe(final Subscription s) {
+                if (bookmarkReactor != null) {
+                    bookmarkReactor.cancel();
+                }
                 bookmarkReactor = s;
                 bookmarkReactor.request(1);
             }
 
             @Override
-            public void onNext(List<PlaylistRemoteEntity> playlist) {
+            public void onNext(final List<PlaylistRemoteEntity> playlist) {
                 playlistEntity = playlist.isEmpty() ? null : playlist.get(0);
 
                 updateBookmarkButtons();
                 isBookmarkButtonReady.set(true);
 
-                if (bookmarkReactor != null) bookmarkReactor.request(1);
+                if (bookmarkReactor != null) {
+                    bookmarkReactor.request(1);
+                }
             }
 
             @Override
-            public void onError(Throwable t) {
+            public void onError(final Throwable t) {
                 PlaylistFragment.this.onError(t);
             }
 
             @Override
-            public void onComplete() {
-
-            }
+            public void onComplete() { }
         };
     }
 
     @Override
-    public void setTitle(String title) {
+    public void setTitle(final String title) {
         super.setTitle(title);
         headerTitleView.setText(title);
     }
 
     private void onBookmarkClicked() {
-        if (isBookmarkButtonReady == null || !isBookmarkButtonReady.get() ||
-                remotePlaylistManager == null)
+        if (isBookmarkButtonReady == null || !isBookmarkButtonReady.get()
+                || remotePlaylistManager == null) {
             return;
+        }
 
         final Disposable action;
 
         if (currentInfo != null && playlistEntity == null) {
             action = remotePlaylistManager.onBookmark(currentInfo)
                     .observeOn(AndroidSchedulers.mainThread())
-                    .subscribe(ignored -> {/* Do nothing */}, this::onError);
+                    .subscribe(ignored -> { /* Do nothing */ }, this::onError);
         } else if (playlistEntity != null) {
             action = remotePlaylistManager.deletePlaylist(playlistEntity.getUid())
                     .observeOn(AndroidSchedulers.mainThread())
                     .doFinally(() -> playlistEntity = null)
-                    .subscribe(ignored -> {/* Do nothing */}, this::onError);
+                    .subscribe(ignored -> { /* Do nothing */ }, this::onError);
         } else {
             action = Disposables.empty();
         }
@@ -438,13 +465,15 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     }
 
     private void updateBookmarkButtons() {
-        if (playlistBookmarkButton == null || activity == null) return;
+        if (playlistBookmarkButton == null || activity == null) {
+            return;
+        }
 
-        final int iconAttr = playlistEntity == null ?
-                R.attr.ic_playlist_add : R.attr.ic_playlist_check;
+        final int iconAttr = playlistEntity == null
+                ? R.attr.ic_playlist_add : R.attr.ic_playlist_check;
 
-        final int titleRes = playlistEntity == null ?
-                R.string.bookmark_playlist : R.string.unbookmark_playlist;
+        final int titleRes = playlistEntity == null
+                ? R.string.bookmark_playlist : R.string.unbookmark_playlist;
 
         playlistBookmarkButton.setIcon(ThemeHelper.resolveResourceIdFromAttr(activity, iconAttr));
         playlistBookmarkButton.setTitle(titleRes);

app/src/main/java/org/schabi/newpipe/fragments/list/search/SearchFragment.java

@@ -6,13 +6,6 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.appcompat.app.ActionBar;
-import androidx.appcompat.app.AlertDialog;
-import androidx.recyclerview.widget.RecyclerView;
-import androidx.appcompat.widget.TooltipCompat;
-import androidx.recyclerview.widget.ItemTouchHelper;
 import android.text.Editable;
 import android.text.TextUtils;
 import android.text.TextWatcher;
@@ -30,6 +23,14 @@ import android.view.inputmethod.InputMethodManager;
 import android.widget.EditText;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.widget.TooltipCompat;
+import androidx.recyclerview.widget.ItemTouchHelper;
+import androidx.recyclerview.widget.RecyclerView;
+
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.ReCaptchaActivity;
 import org.schabi.newpipe.database.history.model.SearchHistoryEntry;
@@ -77,10 +78,8 @@ import static androidx.recyclerview.widget.ItemTouchHelper.Callback.makeMovement
 import static java.util.Arrays.asList;
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
-public class SearchFragment
-        extends BaseListFragment<SearchInfo, ListExtractor.InfoItemsPage>
+public class SearchFragment extends BaseListFragment<SearchInfo, ListExtractor.InfoItemsPage>
         implements BackPressable {
-
     /*//////////////////////////////////////////////////////////////////////////
     // Search
     //////////////////////////////////////////////////////////////////////////*/
@@ -92,35 +91,38 @@ public class SearchFragment
     private static final int THRESHOLD_NETWORK_SUGGESTION = 1;
 
     /**
-     * How much time have to pass without emitting a item (i.e. the user stop typing) to fetch/show the suggestions, in milliseconds.
+     * How much time have to pass without emitting a item (i.e. the user stop typing)
+     * to fetch/show the suggestions, in milliseconds.
      */
     private static final int SUGGESTIONS_DEBOUNCE = 120; //ms
+    private final PublishSubject<String> suggestionPublisher = PublishSubject.create();
 
     @State
-    protected int filterItemCheckedId = -1;
+    int filterItemCheckedId = -1;
 
     @State
     protected int serviceId = Constants.NO_SERVICE_ID;
-    
-    // this three represet the current search query
+
+    // these three represents the current search query
     @State
-    protected String searchString;
+    String searchString;
 
     /**
-     * No content filter should add like contentfilter = all
+     * No content filter should add like contentFilter = all
      * be aware of this when implementing an extractor.
      */
     @State
-    protected String[] contentFilter = new String[0];
+    String[] contentFilter = new String[0];
+
     @State
-    protected String sortFilter;
-    
-    // these represtent the last search
+    String sortFilter;
+
+    // these represents the last search
     @State
-    protected String lastSearchedString;
-    
+    String lastSearchedString;
+
     @State
-    protected boolean wasSearchFocused = false;
+    boolean wasSearchFocused = false;
 
     private Map<Integer, String> menuItemToFilterName;
     private StreamingService service;
@@ -129,7 +131,6 @@ public class SearchFragment
     private String contentCountry;
     private boolean isSuggestionsEnabled = true;
 
-    private final PublishSubject<String> suggestionPublisher = PublishSubject.create();
     private Disposable searchDisposable;
     private Disposable suggestionDisposable;
     private final CompositeDisposable disposables = new CompositeDisposable();
@@ -150,7 +151,9 @@ public class SearchFragment
 
     /*////////////////////////////////////////////////////////////////////////*/
 
-    public static SearchFragment getInstance(int serviceId, String searchString) {
+    private TextWatcher textWatcher;
+
+    public static SearchFragment getInstance(final int serviceId, final String searchString) {
         SearchFragment searchFragment = new SearchFragment();
         searchFragment.setQuery(serviceId, searchString, new String[0], "");
 
@@ -173,33 +176,37 @@ public class SearchFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(final Context context) {
         super.onAttach(context);
 
         suggestionListAdapter = new SuggestionListAdapter(activity);
         SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(activity);
-        boolean isSearchHistoryEnabled = preferences.getBoolean(getString(R.string.enable_search_history_key), true);
+        boolean isSearchHistoryEnabled = preferences
+                .getBoolean(getString(R.string.enable_search_history_key), true);
         suggestionListAdapter.setShowSuggestionHistory(isSearchHistoryEnabled);
 
         historyRecordManager = new HistoryRecordManager(context);
     }
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
+    public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(activity);
-        isSuggestionsEnabled = preferences.getBoolean(getString(R.string.show_search_suggestions_key), true);
-        contentCountry = preferences.getString(getString(R.string.content_country_key), getString(R.string.default_localization_key));
+        isSuggestionsEnabled = preferences
+                .getBoolean(getString(R.string.show_search_suggestions_key), true);
+        contentCountry = preferences.getString(getString(R.string.content_country_key),
+                getString(R.string.default_localization_key));
     }
 
     @Override
-    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+    public View onCreateView(final LayoutInflater inflater, @Nullable final ViewGroup container,
+                             @Nullable final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_search, container, false);
     }
 
     @Override
-    public void onViewCreated(View rootView, Bundle savedInstanceState) {
+    public void onViewCreated(final View rootView, final Bundle savedInstanceState) {
         super.onViewCreated(rootView, savedInstanceState);
         showSearchOnStart();
         initSearchListeners();
@@ -211,15 +218,23 @@ public class SearchFragment
 
         wasSearchFocused = searchEditText.hasFocus();
 
-        if (searchDisposable != null) searchDisposable.dispose();
-        if (suggestionDisposable != null) suggestionDisposable.dispose();
-        if (disposables != null) disposables.clear();
+        if (searchDisposable != null) {
+            searchDisposable.dispose();
+        }
+        if (suggestionDisposable != null) {
+            suggestionDisposable.dispose();
+        }
+        if (disposables != null) {
+            disposables.clear();
+        }
         hideKeyboardSearch();
     }
 
     @Override
     public void onResume() {
-        if (DEBUG) Log.d(TAG, "onResume() called");
+        if (DEBUG) {
+            Log.d(TAG, "onResume() called");
+        }
         super.onResume();
 
         try {
@@ -245,7 +260,9 @@ public class SearchFragment
             }
         }
 
-        if (suggestionDisposable == null || suggestionDisposable.isDisposed()) initSuggestionObserver();
+        if (suggestionDisposable == null || suggestionDisposable.isDisposed()) {
+            initSuggestionObserver();
+        }
 
         if (TextUtils.isEmpty(searchString) || wasSearchFocused) {
             showKeyboardSearch();
@@ -259,7 +276,9 @@ public class SearchFragment
 
     @Override
     public void onDestroyView() {
-        if (DEBUG) Log.d(TAG, "onDestroyView() called");
+        if (DEBUG) {
+            Log.d(TAG, "onDestroyView() called");
+        }
         unsetSearchListeners();
         super.onDestroyView();
     }
@@ -267,19 +286,27 @@ public class SearchFragment
     @Override
     public void onDestroy() {
         super.onDestroy();
-        if (searchDisposable != null) searchDisposable.dispose();
-        if (suggestionDisposable != null) suggestionDisposable.dispose();
-        if (disposables != null) disposables.clear();
+        if (searchDisposable != null) {
+            searchDisposable.dispose();
+        }
+        if (suggestionDisposable != null) {
+            suggestionDisposable.dispose();
+        }
+        if (disposables != null) {
+            disposables.clear();
+        }
     }
 
     @Override
-    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+    public void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
         switch (requestCode) {
             case ReCaptchaActivity.RECAPTCHA_REQUEST:
                 if (resultCode == Activity.RESULT_OK
                         && !TextUtils.isEmpty(searchString)) {
                     search(searchString, contentFilter, sortFilter);
-                } else Log.e(TAG, "ReCaptcha failed");
+                } else {
+                    Log.e(TAG, "ReCaptcha failed");
+                }
                 break;
 
             default:
@@ -293,25 +320,27 @@ public class SearchFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected void initViews(View rootView, Bundle savedInstanceState) {
+    protected void initViews(final View rootView, final Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
         suggestionsPanel = rootView.findViewById(R.id.suggestions_panel);
         suggestionsRecyclerView = rootView.findViewById(R.id.suggestions_list);
         suggestionsRecyclerView.setAdapter(suggestionListAdapter);
         new ItemTouchHelper(new ItemTouchHelper.Callback() {
             @Override
-            public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
+            public int getMovementFlags(@NonNull final RecyclerView recyclerView,
+                                        @NonNull final RecyclerView.ViewHolder viewHolder) {
                 return getSuggestionMovementFlags(recyclerView, viewHolder);
             }
 
             @Override
-            public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder,
-                                  @NonNull RecyclerView.ViewHolder viewHolder1) {
+            public boolean onMove(@NonNull final RecyclerView recyclerView,
+                                  @NonNull final RecyclerView.ViewHolder viewHolder,
+                                  @NonNull final RecyclerView.ViewHolder viewHolder1) {
                 return false;
             }
 
             @Override
-            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
+            public void onSwiped(@NonNull final RecyclerView.ViewHolder viewHolder, final int i) {
                 onSuggestionItemSwiped(viewHolder, i);
             }
         }).attachToRecyclerView(suggestionsRecyclerView);
@@ -326,21 +355,21 @@ public class SearchFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void writeTo(Queue<Object> objectsToSave) {
+    public void writeTo(final Queue<Object> objectsToSave) {
         super.writeTo(objectsToSave);
         objectsToSave.add(currentPageUrl);
         objectsToSave.add(nextPageUrl);
     }
 
     @Override
-    public void readFrom(@NonNull Queue<Object> savedObjects) throws Exception {
+    public void readFrom(@NonNull final Queue<Object> savedObjects) throws Exception {
         super.readFrom(savedObjects);
         currentPageUrl = (String) savedObjects.poll();
         nextPageUrl = (String) savedObjects.poll();
     }
 
     @Override
-    public void onSaveInstanceState(Bundle bundle) {
+    public void onSaveInstanceState(final Bundle bundle) {
         searchString = searchEditText != null
                 ? searchEditText.getText().toString()
                 : searchString;
@@ -372,7 +401,7 @@ public class SearchFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);
 
         ActionBar supportActionBar = activity.getSupportActionBar();
@@ -386,13 +415,13 @@ public class SearchFragment
         int itemId = 0;
         boolean isFirstItem = true;
         final Context c = getContext();
-        for(String filter : service.getSearchQHFactory().getAvailableContentFilter()) {
+        for (String filter : service.getSearchQHFactory().getAvailableContentFilter()) {
             menuItemToFilterName.put(itemId, filter);
             MenuItem item = menu.add(1,
                     itemId++,
                     0,
                     ServiceHelper.getTranslatedFilterString(filter, c));
-            if(isFirstItem) {
+            if (isFirstItem) {
                 item.setChecked(true);
                 isFirstItem = false;
             }
@@ -403,19 +432,20 @@ public class SearchFragment
     }
 
     @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
-
-        List<String> contentFilter = new ArrayList<>(1);
-        contentFilter.add(menuItemToFilterName.get(item.getItemId()));
-        changeContentFilter(item, contentFilter);
+    public boolean onOptionsItemSelected(final MenuItem item) {
+        List<String> cf = new ArrayList<>(1);
+        cf.add(menuItemToFilterName.get(item.getItemId()));
+        changeContentFilter(item, cf);
 
         return true;
     }
 
-    private void restoreFilterChecked(Menu menu, int itemId) {
+    private void restoreFilterChecked(final Menu menu, final int itemId) {
         if (itemId != -1) {
             MenuItem item = menu.findItem(itemId);
-            if (item == null) return;
+            if (item == null) {
+                return;
+            }
 
             item.setChecked(true);
         }
@@ -425,13 +455,13 @@ public class SearchFragment
     // Search
     //////////////////////////////////////////////////////////////////////////*/
 
-    private TextWatcher textWatcher;
-
     private void showSearchOnStart() {
-        if (DEBUG) Log.d(TAG, "showSearchOnStart() called, searchQuery → "
-                + searchString
-                + ", lastSearchedQuery → "
-                + lastSearchedString);
+        if (DEBUG) {
+            Log.d(TAG, "showSearchOnStart() called, searchQuery → "
+                    + searchString
+                    + ", lastSearchedQuery → "
+                    + lastSearchedString);
+        }
         searchEditText.setText(searchString);
 
         if (TextUtils.isEmpty(searchString) || TextUtils.isEmpty(searchEditText.getText())) {
@@ -451,9 +481,13 @@ public class SearchFragment
     }
 
     private void initSearchListeners() {
-        if (DEBUG) Log.d(TAG, "initSearchListeners() called");
+        if (DEBUG) {
+            Log.d(TAG, "initSearchListeners() called");
+        }
         searchClear.setOnClickListener(v -> {
-            if (DEBUG) Log.d(TAG, "onClick() called with: v = [" + v + "]");
+            if (DEBUG) {
+                Log.d(TAG, "onClick() called with: v = [" + v + "]");
+            }
             if (TextUtils.isEmpty(searchEditText.getText())) {
                 NavigationHelper.gotoMainFragment(getFragmentManager());
                 return;
@@ -467,7 +501,9 @@ public class SearchFragment
         TooltipCompat.setTooltipText(searchClear, getString(R.string.clear));
 
         searchEditText.setOnClickListener(v -> {
-            if (DEBUG) Log.d(TAG, "onClick() called with: v = [" + v + "]");
+            if (DEBUG) {
+                Log.d(TAG, "onClick() called with: v = [" + v + "]");
+            }
             if (isSuggestionsEnabled && errorPanelRoot.getVisibility() != View.VISIBLE) {
                 showSuggestionsPanel();
             }
@@ -477,43 +513,51 @@ public class SearchFragment
         });
 
         searchEditText.setOnFocusChangeListener((View v, boolean hasFocus) -> {
-            if (DEBUG) Log.d(TAG, "onFocusChange() called with: v = [" + v + "], hasFocus = [" + hasFocus + "]");
-            if (isSuggestionsEnabled && hasFocus && errorPanelRoot.getVisibility() != View.VISIBLE) {
+            if (DEBUG) {
+                Log.d(TAG, "onFocusChange() called with: "
+                        + "v = [" + v + "], hasFocus = [" + hasFocus + "]");
+            }
+            if (isSuggestionsEnabled && hasFocus
+                    && errorPanelRoot.getVisibility() != View.VISIBLE) {
                 showSuggestionsPanel();
             }
         });
 
         suggestionListAdapter.setListener(new SuggestionListAdapter.OnSuggestionItemSelected() {
             @Override
-            public void onSuggestionItemSelected(SuggestionItem item) {
+            public void onSuggestionItemSelected(final SuggestionItem item) {
                 search(item.query, new String[0], "");
                 searchEditText.setText(item.query);
             }
 
             @Override
-            public void onSuggestionItemInserted(SuggestionItem item) {
+            public void onSuggestionItemInserted(final SuggestionItem item) {
                 searchEditText.setText(item.query);
                 searchEditText.setSelection(searchEditText.getText().length());
             }
 
             @Override
-            public void onSuggestionItemLongClick(SuggestionItem item) {
-                if (item.fromHistory) showDeleteSuggestionDialog(item);
+            public void onSuggestionItemLongClick(final SuggestionItem item) {
+                if (item.fromHistory) {
+                    showDeleteSuggestionDialog(item);
+                }
             }
         });
 
-        if (textWatcher != null) searchEditText.removeTextChangedListener(textWatcher);
+        if (textWatcher != null) {
+            searchEditText.removeTextChangedListener(textWatcher);
+        }
         textWatcher = new TextWatcher() {
             @Override
-            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
-            }
+            public void beforeTextChanged(final CharSequence s, final int start,
+                                          final int count, final int after) { }
 
             @Override
-            public void onTextChanged(CharSequence s, int start, int before, int count) {
-            }
+            public void onTextChanged(final CharSequence s, final int start,
+                                      final int before, final int count) { }
 
             @Override
-            public void afterTextChanged(Editable s) {
+            public void afterTextChanged(final Editable s) {
                 String newText = searchEditText.getText().toString();
                 suggestionPublisher.onNext(newText);
             }
@@ -522,48 +566,62 @@ public class SearchFragment
         searchEditText.setOnEditorActionListener(
                 (TextView v, int actionId, KeyEvent event) -> {
                     if (DEBUG) {
-                        Log.d(TAG, "onEditorAction() called with: v = [" + v + "], actionId = [" + actionId + "], event = [" + event + "]");
+                        Log.d(TAG, "onEditorAction() called with: v = [" + v + "], "
+                                + "actionId = [" + actionId + "], event = [" + event + "]");
                     }
-                    if(actionId == EditorInfo.IME_ACTION_PREVIOUS){
+                    if (actionId == EditorInfo.IME_ACTION_PREVIOUS) {
                         hideKeyboardSearch();
                     } else if (event != null
                             && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER
-                                || event.getAction() == EditorInfo.IME_ACTION_SEARCH)) {
+                            || event.getAction() == EditorInfo.IME_ACTION_SEARCH)) {
                         search(searchEditText.getText().toString(), new String[0], "");
                         return true;
                     }
                     return false;
                 });
 
-        if (suggestionDisposable == null || suggestionDisposable.isDisposed())
+        if (suggestionDisposable == null || suggestionDisposable.isDisposed()) {
             initSuggestionObserver();
+        }
     }
 
     private void unsetSearchListeners() {
-        if (DEBUG) Log.d(TAG, "unsetSearchListeners() called");
+        if (DEBUG) {
+            Log.d(TAG, "unsetSearchListeners() called");
+        }
         searchClear.setOnClickListener(null);
         searchClear.setOnLongClickListener(null);
         searchEditText.setOnClickListener(null);
         searchEditText.setOnFocusChangeListener(null);
         searchEditText.setOnEditorActionListener(null);
 
-        if (textWatcher != null) searchEditText.removeTextChangedListener(textWatcher);
+        if (textWatcher != null) {
+            searchEditText.removeTextChangedListener(textWatcher);
+        }
         textWatcher = null;
     }
 
     private void showSuggestionsPanel() {
-        if (DEBUG) Log.d(TAG, "showSuggestionsPanel() called");
+        if (DEBUG) {
+            Log.d(TAG, "showSuggestionsPanel() called");
+        }
         animateView(suggestionsPanel, AnimationUtils.Type.LIGHT_SLIDE_AND_ALPHA, true, 200);
     }
 
     private void hideSuggestionsPanel() {
-        if (DEBUG) Log.d(TAG, "hideSuggestionsPanel() called");
+        if (DEBUG) {
+            Log.d(TAG, "hideSuggestionsPanel() called");
+        }
         animateView(suggestionsPanel, AnimationUtils.Type.LIGHT_SLIDE_AND_ALPHA, false, 200);
     }
 
     private void showKeyboardSearch() {
-        if (DEBUG) Log.d(TAG, "showKeyboardSearch() called");
-        if (searchEditText == null) return;
+        if (DEBUG) {
+            Log.d(TAG, "showKeyboardSearch() called");
+        }
+        if (searchEditText == null) {
+            return;
+        }
 
         if (searchEditText.requestFocus()) {
             InputMethodManager imm = (InputMethodManager) activity.getSystemService(
@@ -573,19 +631,26 @@ public class SearchFragment
     }
 
     private void hideKeyboardSearch() {
-        if (DEBUG) Log.d(TAG, "hideKeyboardSearch() called");
-        if (searchEditText == null) return;
+        if (DEBUG) {
+            Log.d(TAG, "hideKeyboardSearch() called");
+        }
+        if (searchEditText == null) {
+            return;
+        }
 
-        InputMethodManager imm = (InputMethodManager) activity.getSystemService(
-                Context.INPUT_METHOD_SERVICE);
-        imm.hideSoftInputFromWindow(searchEditText.getWindowToken(), InputMethodManager.RESULT_UNCHANGED_SHOWN);
+        InputMethodManager imm = (InputMethodManager) activity
+                .getSystemService(Context.INPUT_METHOD_SERVICE);
+        imm.hideSoftInputFromWindow(searchEditText.getWindowToken(),
+                InputMethodManager.RESULT_UNCHANGED_SHOWN);
 
         searchEditText.clearFocus();
     }
 
     private void showDeleteSuggestionDialog(final SuggestionItem item) {
-        if (activity == null || historyRecordManager == null || suggestionPublisher == null ||
-                searchEditText == null || disposables == null) return;
+        if (activity == null || historyRecordManager == null || suggestionPublisher == null
+                || searchEditText == null || disposables == null) {
+            return;
+        }
         final String query = item.query;
         new AlertDialog.Builder(activity)
                 .setTitle(query)
@@ -624,15 +689,19 @@ public class SearchFragment
     }
 
     private void initSuggestionObserver() {
-        if (DEBUG) Log.d(TAG, "initSuggestionObserver() called");
-        if (suggestionDisposable != null) suggestionDisposable.dispose();
+        if (DEBUG) {
+            Log.d(TAG, "initSuggestionObserver() called");
+        }
+        if (suggestionDisposable != null) {
+            suggestionDisposable.dispose();
+        }
 
         final Observable<String> observable = suggestionPublisher
                 .debounce(SUGGESTIONS_DEBOUNCE, TimeUnit.MILLISECONDS)
                 .startWith(searchString != null
                         ? searchString
                         : "")
-                .filter(searchString -> isSuggestionsEnabled);
+                .filter(ss -> isSuggestionsEnabled);
 
         suggestionDisposable = observable
                 .switchMap(query -> {
@@ -641,13 +710,15 @@ public class SearchFragment
                     final Observable<List<SuggestionItem>> local = flowable.toObservable()
                             .map(searchHistoryEntries -> {
                                 List<SuggestionItem> result = new ArrayList<>();
-                                for (SearchHistoryEntry entry : searchHistoryEntries)
+                                for (SearchHistoryEntry entry : searchHistoryEntries) {
                                     result.add(new SuggestionItem(true, entry.getSearch()));
+                                }
                                 return result;
                             });
 
                     if (query.length() < THRESHOLD_NETWORK_SUGGESTION) {
-                        // Only pass through if the query length is equal or greater than THRESHOLD_NETWORK_SUGGESTION
+                        // Only pass through if the query length
+                        // is equal or greater than THRESHOLD_NETWORK_SUGGESTION
                         return local.materialize();
                     }
 
@@ -664,7 +735,9 @@ public class SearchFragment
 
                     return Observable.zip(local, network, (localResult, networkResult) -> {
                         List<SuggestionItem> result = new ArrayList<>();
-                        if (localResult.size() > 0) result.addAll(localResult);
+                        if (localResult.size() > 0) {
+                            result.addAll(localResult);
+                        }
 
                         // Remove duplicates
                         final Iterator<SuggestionItem> iterator = networkResult.iterator();
@@ -678,7 +751,9 @@ public class SearchFragment
                             }
                         }
 
-                        if (networkResult.size() > 0) result.addAll(networkResult);
+                        if (networkResult.size() > 0) {
+                            result.addAll(networkResult);
+                        }
                         return result;
                     }).materialize();
                 })
@@ -703,17 +778,21 @@ public class SearchFragment
         // no-op
     }
 
-    private void search(final String searchString, String[] contentFilter, String sortFilter) {
-        if (DEBUG) Log.d(TAG, "search() called with: query = [" + searchString + "]");
-        if (searchString.isEmpty()) return;
+    private void search(final String ss, final String[] cf, final String sf) {
+        if (DEBUG) {
+            Log.d(TAG, "search() called with: query = [" + ss + "]");
+        }
+        if (ss.isEmpty()) {
+            return;
+        }
 
         try {
-            final StreamingService service = NewPipe.getServiceByUrl(searchString);
-            if (service != null) {
+            final StreamingService streamingService = NewPipe.getServiceByUrl(ss);
+            if (streamingService != null) {
                 showLoading();
                 disposables.add(Observable
                         .fromCallable(() ->
-                                NavigationHelper.getIntentByLink(activity, service, searchString))
+                                NavigationHelper.getIntentByLink(activity, streamingService, ss))
                         .subscribeOn(Schedulers.io())
                         .observeOn(AndroidSchedulers.mainThread())
                         .subscribe(intent -> {
@@ -728,31 +807,36 @@ public class SearchFragment
         }
 
         lastSearchedString = this.searchString;
-        this.searchString = searchString;
+        this.searchString = ss;
         infoListAdapter.clearStreamItemList();
         hideSuggestionsPanel();
         hideKeyboardSearch();
 
-        historyRecordManager.onSearched(serviceId, searchString)
+        historyRecordManager.onSearched(serviceId, ss)
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(
-                        ignored -> {},
+                        ignored -> {
+                        },
                         error -> showSnackBarError(error, UserAction.SEARCHED,
-                                NewPipe.getNameOfService(serviceId), searchString, 0)
+                                NewPipe.getNameOfService(serviceId), ss, 0)
                 );
-        suggestionPublisher.onNext(searchString);
+        suggestionPublisher.onNext(ss);
         startLoading(false);
     }
 
     @Override
-    public void startLoading(boolean forceLoad) {
+    public void startLoading(final boolean forceLoad) {
         super.startLoading(forceLoad);
-        if (disposables != null) disposables.clear();
-        if (searchDisposable != null) searchDisposable.dispose();
+        if (disposables != null) {
+            disposables.clear();
+        }
+        if (searchDisposable != null) {
+            searchDisposable.dispose();
+        }
         searchDisposable = ExtractorHelper.searchFor(serviceId,
-                    searchString,
-                    Arrays.asList(contentFilter),
-                    sortFilter)
+                searchString,
+                Arrays.asList(contentFilter),
+                sortFilter)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .doOnEvent((searchResult, throwable) -> isLoading.set(false))
@@ -762,16 +846,20 @@ public class SearchFragment
 
     @Override
     protected void loadMoreItems() {
-        if(nextPageUrl == null || nextPageUrl.isEmpty()) return;
+        if (nextPageUrl == null || nextPageUrl.isEmpty()) {
+            return;
+        }
         isLoading.set(true);
         showListFooter(true);
-        if (searchDisposable != null) searchDisposable.dispose();
+        if (searchDisposable != null) {
+            searchDisposable.dispose();
+        }
         searchDisposable = ExtractorHelper.getMoreSearchItems(
-                    serviceId,
-                    searchString,
-                    asList(contentFilter),
-                    sortFilter,
-                    nextPageUrl)
+                serviceId,
+                searchString,
+                asList(contentFilter),
+                sortFilter,
+                nextPageUrl)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .doOnEvent((nextItemsResult, throwable) -> isLoading.set(false))
@@ -785,7 +873,7 @@ public class SearchFragment
     }
 
     @Override
-    protected void onItemSelected(InfoItem selectedItem) {
+    protected void onItemSelected(final InfoItem selectedItem) {
         super.onItemSelected(selectedItem);
         hideKeyboardSearch();
     }
@@ -794,22 +882,22 @@ public class SearchFragment
     // Utils
     //////////////////////////////////////////////////////////////////////////*/
 
-    private void changeContentFilter(MenuItem item, List<String> contentFilter) {
+    private void changeContentFilter(final MenuItem item, final List<String> cf) {
         this.filterItemCheckedId = item.getItemId();
         item.setChecked(true);
 
-        this.contentFilter = new String[] {contentFilter.get(0)};
+        this.contentFilter = new String[]{cf.get(0)};
 
         if (!TextUtils.isEmpty(searchString)) {
             search(searchString, this.contentFilter, sortFilter);
         }
     }
 
-    private void setQuery(int serviceId, String searchString, String[] contentfilter, String sortFilter) {
-        this.serviceId = serviceId;
+    private void setQuery(final int sid, final String ss, final String[] cf, final String sf) {
+        this.serviceId = sid;
         this.searchString = searchString;
-        this.contentFilter = contentfilter;
-        this.sortFilter = sortFilter;
+        this.contentFilter = cf;
+        this.sortFilter = sf;
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -817,7 +905,9 @@ public class SearchFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     public void handleSuggestions(@NonNull final List<SuggestionItem> suggestions) {
-        if (DEBUG) Log.d(TAG, "handleSuggestions() called with: suggestions = [" + suggestions + "]");
+        if (DEBUG) {
+            Log.d(TAG, "handleSuggestions() called with: suggestions = [" + suggestions + "]");
+        }
         suggestionsRecyclerView.smoothScrollToPosition(0);
         suggestionsRecyclerView.post(() -> suggestionListAdapter.setItems(suggestions));
 
@@ -826,9 +916,13 @@ public class SearchFragment
         }
     }
 
-    public void onSuggestionError(Throwable exception) {
-        if (DEBUG) Log.d(TAG, "onSuggestionError() called with: exception = [" + exception + "]");
-        if (super.onError(exception)) return;
+    public void onSuggestionError(final Throwable exception) {
+        if (DEBUG) {
+            Log.d(TAG, "onSuggestionError() called with: exception = [" + exception + "]");
+        }
+        if (super.onError(exception)) {
+            return;
+        }
 
         int errorId = exception instanceof ParsingException
                 ? R.string.parsing_error
@@ -848,7 +942,7 @@ public class SearchFragment
     }
 
     @Override
-    public void showError(String message, boolean showRetryButton) {
+    public void showError(final String message, final boolean showRetryButton) {
         super.showError(message, showRetryButton);
         hideSuggestionsPanel();
         hideKeyboardSearch();
@@ -859,11 +953,11 @@ public class SearchFragment
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void handleResult(@NonNull SearchInfo result) {
+    public void handleResult(@NonNull final SearchInfo result) {
         final List<Throwable> exceptions = result.getErrors();
         if (!exceptions.isEmpty()
-            && !(exceptions.size() == 1
-                && exceptions.get(0) instanceof SearchExtractor.NothingFoundException)){
+                && !(exceptions.size() == 1
+                && exceptions.get(0) instanceof SearchExtractor.NothingFoundException)) {
             showSnackBarError(result.getErrors(), UserAction.SEARCHED,
                     NewPipe.getNameOfService(serviceId), searchString, 0);
         }
@@ -886,7 +980,7 @@ public class SearchFragment
     }
 
     @Override
-    public void handleNextItems(ListExtractor.InfoItemsPage result) {
+    public void handleNextItems(final ListExtractor.InfoItemsPage result) {
         showListFooter(false);
         currentPageUrl = result.getNextPageUrl();
         infoListAdapter.addInfoItemList(result.getItems());
@@ -894,15 +988,17 @@ public class SearchFragment
 
         if (!result.getErrors().isEmpty()) {
             showSnackBarError(result.getErrors(), UserAction.SEARCHED,
-                    NewPipe.getNameOfService(serviceId)
-                    , "\"" + searchString + "\" → page: " + nextPageUrl, 0);
+                    NewPipe.getNameOfService(serviceId),
+                    "\"" + searchString + "\" → page: " + nextPageUrl, 0);
         }
         super.handleNextItems(result);
     }
 
     @Override
-    protected boolean onError(Throwable exception) {
-        if (super.onError(exception)) return true;
+    protected boolean onError(final Throwable exception) {
+        if (super.onError(exception)) {
+            return true;
+        }
 
         if (exception instanceof SearchExtractor.NothingFoundException) {
             infoListAdapter.clearStreamItemList();
@@ -922,13 +1018,16 @@ public class SearchFragment
     // Suggestion item touch helper
     //////////////////////////////////////////////////////////////////////////*/
 
-    public int getSuggestionMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
+    public int getSuggestionMovementFlags(@NonNull final RecyclerView recyclerView,
+                                          @NonNull final RecyclerView.ViewHolder viewHolder) {
         final int position = viewHolder.getAdapterPosition();
         final SuggestionItem item = suggestionListAdapter.getItem(position);
-        return item.fromHistory ? makeMovementFlags(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) : 0;
+        return item.fromHistory ? makeMovementFlags(0,
+                ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) : 0;
     }
 
-    public void onSuggestionItemSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
+    public void onSuggestionItemSwiped(@NonNull final RecyclerView.ViewHolder viewHolder,
+                                       final int i) {
         final int position = viewHolder.getAdapterPosition();
         final String query = suggestionListAdapter.getItem(position).query;
         final Disposable onDelete = historyRecordManager.deleteSearchHistory(query)

app/src/main/java/org/schabi/newpipe/fragments/list/search/SuggestionItem.java

@@ -1,10 +1,10 @@
 package org.schabi.newpipe.fragments.list.search;
 
 public class SuggestionItem {
-    public final boolean fromHistory;
+    final boolean fromHistory;
     public final String query;
 
-    public SuggestionItem(boolean fromHistory, String query) {
+    public SuggestionItem(final boolean fromHistory, final String query) {
         this.fromHistory = fromHistory;
         this.query = query;
     }

app/src/main/java/org/schabi/newpipe/fragments/list/search/SuggestionListAdapter.java

@@ -2,36 +2,32 @@ package org.schabi.newpipe.fragments.list.search;
 
 import android.content.Context;
 import android.content.res.TypedArray;
-import androidx.annotation.AttrRes;
-import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
+import androidx.annotation.AttrRes;
+import androidx.recyclerview.widget.RecyclerView;
+
 import org.schabi.newpipe.R;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class SuggestionListAdapter extends RecyclerView.Adapter<SuggestionListAdapter.SuggestionItemHolder> {
+public class SuggestionListAdapter
+        extends RecyclerView.Adapter<SuggestionListAdapter.SuggestionItemHolder> {
     private final ArrayList<SuggestionItem> items = new ArrayList<>();
     private final Context context;
     private OnSuggestionItemSelected listener;
     private boolean showSuggestionHistory = true;
 
-    public interface OnSuggestionItemSelected {
-        void onSuggestionItemSelected(SuggestionItem item);
-        void onSuggestionItemInserted(SuggestionItem item);
-        void onSuggestionItemLongClick(SuggestionItem item);
-    }
-
-    public SuggestionListAdapter(Context context) {
+    public SuggestionListAdapter(final Context context) {
         this.context = context;
     }
 
-    public void setItems(List<SuggestionItem> items) {
+    public void setItems(final List<SuggestionItem> items) {
         this.items.clear();
         if (showSuggestionHistory) {
             this.items.addAll(items);
@@ -46,36 +42,43 @@ public class SuggestionListAdapter extends RecyclerView.Adapter<SuggestionListAd
         notifyDataSetChanged();
     }
 
-    public void setListener(OnSuggestionItemSelected listener) {
+    public void setListener(final OnSuggestionItemSelected listener) {
         this.listener = listener;
     }
 
-    public void setShowSuggestionHistory(boolean v) {
+    public void setShowSuggestionHistory(final boolean v) {
         showSuggestionHistory = v;
     }
 
     @Override
-    public SuggestionItemHolder onCreateViewHolder(ViewGroup parent, int viewType) {
-        return new SuggestionItemHolder(LayoutInflater.from(context).inflate(R.layout.item_search_suggestion, parent, false));
+    public SuggestionItemHolder onCreateViewHolder(final ViewGroup parent, final int viewType) {
+        return new SuggestionItemHolder(LayoutInflater.from(context)
+                .inflate(R.layout.item_search_suggestion, parent, false));
     }
 
     @Override
-    public void onBindViewHolder(SuggestionItemHolder holder, int position) {
+    public void onBindViewHolder(final SuggestionItemHolder holder, final int position) {
         final SuggestionItem currentItem = getItem(position);
         holder.updateFrom(currentItem);
         holder.queryView.setOnClickListener(v -> {
-            if (listener != null) listener.onSuggestionItemSelected(currentItem);
+            if (listener != null) {
+                listener.onSuggestionItemSelected(currentItem);
+            }
         });
         holder.queryView.setOnLongClickListener(v -> {
-                if (listener != null) listener.onSuggestionItemLongClick(currentItem);
-                return true;
+            if (listener != null) {
+                listener.onSuggestionItemLongClick(currentItem);
+            }
+            return true;
         });
         holder.insertView.setOnClickListener(v -> {
-            if (listener != null) listener.onSuggestionItemInserted(currentItem);
+            if (listener != null) {
+                listener.onSuggestionItemInserted(currentItem);
+            }
         });
     }
 
-    SuggestionItem getItem(int position) {
+    SuggestionItem getItem(final int position) {
         return items.get(position);
     }
 
@@ -88,7 +91,15 @@ public class SuggestionListAdapter extends RecyclerView.Adapter<SuggestionListAd
         return getItemCount() == 0;
     }
 
-    public static class SuggestionItemHolder extends RecyclerView.ViewHolder {
+    public interface OnSuggestionItemSelected {
+        void onSuggestionItemSelected(SuggestionItem item);
+
+        void onSuggestionItemInserted(SuggestionItem item);
+
+        void onSuggestionItemLongClick(SuggestionItem item);
+    }
+
+    public static final class SuggestionItemHolder extends RecyclerView.ViewHolder {
         private final TextView itemSuggestionQuery;
         private final ImageView suggestionIcon;
         private final View queryView;
@@ -98,7 +109,7 @@ public class SuggestionListAdapter extends RecyclerView.Adapter<SuggestionListAd
         private final int historyResId;
         private final int searchResId;
 
-        private SuggestionItemHolder(View rootView) {
+        private SuggestionItemHolder(final View rootView) {
             super(rootView);
             suggestionIcon = rootView.findViewById(R.id.item_suggestion_icon);
             itemSuggestionQuery = rootView.findViewById(R.id.item_suggestion_query);
@@ -110,16 +121,17 @@ public class SuggestionListAdapter extends RecyclerView.Adapter<SuggestionListAd
             searchResId = resolveResourceIdFromAttr(rootView.getContext(), R.attr.search);
         }
 
-        private void updateFrom(SuggestionItem item) {
-            suggestionIcon.setImageResource(item.fromHistory ? historyResId : searchResId);
-            itemSuggestionQuery.setText(item.query);
-        }
-
-        private static int resolveResourceIdFromAttr(Context context, @AttrRes int attr) {
+        private static int resolveResourceIdFromAttr(final Context context,
+                                                     @AttrRes final int attr) {
             TypedArray a = context.getTheme().obtainStyledAttributes(new int[]{attr});
             int attributeResourceId = a.getResourceId(0, 0);
             a.recycle();
             return attributeResourceId;
         }
+
+        private void updateFrom(final SuggestionItem item) {
+            suggestionIcon.setImageResource(item.fromHistory ? historyResId : searchResId);
+            itemSuggestionQuery.setText(item.query);
+        }
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/videos/RelatedVideosFragment.java

@@ -4,8 +4,6 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -14,6 +12,9 @@ import android.view.ViewGroup;
 import android.widget.CompoundButton;
 import android.widget.Switch;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.NewPipe;
@@ -28,53 +29,61 @@ import java.io.Serializable;
 import io.reactivex.Single;
 import io.reactivex.disposables.CompositeDisposable;
 
-public class RelatedVideosFragment extends BaseListInfoFragment<RelatedStreamInfo> implements SharedPreferences.OnSharedPreferenceChangeListener{
-
+public class RelatedVideosFragment extends BaseListInfoFragment<RelatedStreamInfo>
+        implements SharedPreferences.OnSharedPreferenceChangeListener {
+    private static final String INFO_KEY = "related_info_key";
     private CompositeDisposable disposables = new CompositeDisposable();
     private RelatedStreamInfo relatedStreamInfo;
+
     /*//////////////////////////////////////////////////////////////////////////
     // Views
     //////////////////////////////////////////////////////////////////////////*/
+
     private View headerRootLayout;
     private Switch aSwitch;
 
     private boolean mIsVisibleToUser = false;
 
-    public static RelatedVideosFragment getInstance(StreamInfo info) {
+    public static RelatedVideosFragment getInstance(final StreamInfo info) {
         RelatedVideosFragment instance = new RelatedVideosFragment();
         instance.setInitialData(info);
         return instance;
     }
 
+    @Override
+    public void setUserVisibleHint(final boolean isVisibleToUser) {
+        super.setUserVisibleHint(isVisibleToUser);
+        mIsVisibleToUser = isVisibleToUser;
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // LifeCycle
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void setUserVisibleHint(boolean isVisibleToUser) {
-        super.setUserVisibleHint(isVisibleToUser);
-        mIsVisibleToUser = isVisibleToUser;
-    }
-
-    @Override
-    public void onAttach(Context context) {
+    public void onAttach(final Context context) {
         super.onAttach(context);
     }
 
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+    public View onCreateView(@NonNull final LayoutInflater inflater,
+                             @Nullable final ViewGroup container,
+                             @Nullable final Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_related_streams, container, false);
     }
 
     @Override
     public void onDestroy() {
         super.onDestroy();
-        if (disposables != null) disposables.clear();
+        if (disposables != null) {
+            disposables.clear();
+        }
     }
 
-    protected View getListHeader(){
-        if(relatedStreamInfo != null && relatedStreamInfo.getNextStream() != null){
-            headerRootLayout = activity.getLayoutInflater().inflate(R.layout.related_streams_header, itemsList, false);
+    protected View getListHeader() {
+        if (relatedStreamInfo != null && relatedStreamInfo.getNextStream() != null) {
+            headerRootLayout = activity.getLayoutInflater()
+                    .inflate(R.layout.related_streams_header, itemsList, false);
             aSwitch = headerRootLayout.findViewById(R.id.autoplay_switch);
 
             SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getContext());
@@ -82,14 +91,14 @@ public class RelatedVideosFragment extends BaseListInfoFragment<RelatedStreamInf
             aSwitch.setChecked(autoplay);
             aSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                 @Override
-                public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
-                    SharedPreferences.Editor prefEdit = PreferenceManager.getDefaultSharedPreferences(getContext()).edit();
-                    prefEdit.putBoolean(getString(R.string.auto_queue_key), b);
-                    prefEdit.apply();
+                public void onCheckedChanged(final CompoundButton compoundButton,
+                                             final boolean b) {
+                    PreferenceManager.getDefaultSharedPreferences(getContext()).edit()
+                            .putBoolean(getString(R.string.auto_queue_key), b).apply();
                 }
             });
             return headerRootLayout;
-        }else{
+        } else {
             return null;
         }
     }
@@ -99,38 +108,44 @@ public class RelatedVideosFragment extends BaseListInfoFragment<RelatedStreamInf
         return Single.fromCallable(() -> ListExtractor.InfoItemsPage.emptyPage());
     }
 
-    @Override
-    protected Single<RelatedStreamInfo> loadResult(boolean forceLoad) {
-        return Single.fromCallable(() -> relatedStreamInfo);
-    }
-
     /*//////////////////////////////////////////////////////////////////////////
     // Contract
     //////////////////////////////////////////////////////////////////////////*/
 
+    @Override
+    protected Single<RelatedStreamInfo> loadResult(final boolean forceLoad) {
+        return Single.fromCallable(() -> relatedStreamInfo);
+    }
+
     @Override
     public void showLoading() {
         super.showLoading();
-        if(null != headerRootLayout) headerRootLayout.setVisibility(View.INVISIBLE);
+        if (headerRootLayout != null) {
+            headerRootLayout.setVisibility(View.INVISIBLE);
+        }
     }
 
     @Override
-    public void handleResult(@NonNull RelatedStreamInfo result) {
-
+    public void handleResult(@NonNull final RelatedStreamInfo result) {
         super.handleResult(result);
 
-        if(null != headerRootLayout) headerRootLayout.setVisibility(View.VISIBLE);
-        AnimationUtils.slideUp(getView(),120, 96, 0.06f);
+        if (headerRootLayout != null) {
+            headerRootLayout.setVisibility(View.VISIBLE);
+        }
+        AnimationUtils.slideUp(getView(), 120, 96, 0.06f);
 
         if (!result.getErrors().isEmpty()) {
-            showSnackBarError(result.getErrors(), UserAction.REQUESTED_STREAM, NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
+            showSnackBarError(result.getErrors(), UserAction.REQUESTED_STREAM,
+                    NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
         }
 
-        if (disposables != null) disposables.clear();
+        if (disposables != null) {
+            disposables.clear();
+        }
     }
 
     @Override
-    public void handleNextItems(ListExtractor.InfoItemsPage result) {
+    public void handleNextItems(final ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
 
         if (!result.getErrors().isEmpty()) {
@@ -147,11 +162,14 @@ public class RelatedVideosFragment extends BaseListInfoFragment<RelatedStreamInf
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected boolean onError(Throwable exception) {
-        if (super.onError(exception)) return true;
+    protected boolean onError(final Throwable exception) {
+        if (super.onError(exception)) {
+            return true;
+        }
 
         hideLoading();
-        showSnackBarError(exception, UserAction.REQUESTED_STREAM, NewPipe.getNameOfService(serviceId), url, R.string.general_error);
+        showSnackBarError(exception, UserAction.REQUESTED_STREAM,
+                NewPipe.getNameOfService(serviceId), url, R.string.general_error);
         return true;
     }
 
@@ -160,45 +178,47 @@ public class RelatedVideosFragment extends BaseListInfoFragment<RelatedStreamInf
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void setTitle(String title) {
+    public void setTitle(final String title) {
         return;
     }
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
         return;
     }
 
-    private void setInitialData(StreamInfo info) {
+    private void setInitialData(final StreamInfo info) {
         super.setInitialData(info.getServiceId(), info.getUrl(), info.getName());
-        if(this.relatedStreamInfo == null) this.relatedStreamInfo = RelatedStreamInfo.getInfo(info);
+        if (this.relatedStreamInfo == null) {
+            this.relatedStreamInfo = RelatedStreamInfo.getInfo(info);
+        }
     }
 
-
-    private static final String INFO_KEY = "related_info_key";
-
     @Override
-    public void onSaveInstanceState(Bundle outState) {
+    public void onSaveInstanceState(final Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putSerializable(INFO_KEY, relatedStreamInfo);
     }
 
     @Override
-    protected void onRestoreInstanceState(@NonNull Bundle savedState) {
+    protected void onRestoreInstanceState(@NonNull final Bundle savedState) {
         super.onRestoreInstanceState(savedState);
         if (savedState != null) {
             Serializable serializable = savedState.getSerializable(INFO_KEY);
-            if(serializable instanceof RelatedStreamInfo){
+            if (serializable instanceof RelatedStreamInfo) {
                 this.relatedStreamInfo = (RelatedStreamInfo) serializable;
             }
         }
     }
 
     @Override
-    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String s) {
+    public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences,
+                                          final String s) {
         SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getContext());
-        Boolean autoplay = pref.getBoolean(getString(R.string.auto_queue_key), false);
-        if(null != aSwitch) aSwitch.setChecked(autoplay);
+        boolean autoplay = pref.getBoolean(getString(R.string.auto_queue_key), false);
+        if (null != aSwitch) {
+            aSwitch.setChecked(autoplay);
+        }
     }
 
     @Override