Remove ugly if-else-cascade in

Common actions and labels are now in a unique enum: StreamDialogEntry
If an action is not common to every long-press menu (e.g. delete) a custom action has to be provided using e.g. delete.setAction(...)

app/src/main/java/org/schabi/newpipe/util/StreamDialogEntry.java

@@ -0,0 +1,92 @@
+package org.schabi.newpipe.util;
+
+import android.content.Context;
+import android.support.v4.app.Fragment;
+
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.extractor.stream.StreamInfoItem;
+import org.schabi.newpipe.local.dialog.PlaylistAppendDialog;
+import org.schabi.newpipe.player.playqueue.SinglePlayQueue;
+
+import java.util.Collections;
+
+public enum StreamDialogEntry {
+    //////////////////////////////
+    // enum values with actions //
+    //////////////////////////////
+
+    enqueue_on_background(R.string.enqueue_on_background, (fragment, item) ->
+            NavigationHelper.enqueueOnBackgroundPlayer(fragment.getContext(), new SinglePlayQueue(item), false)),
+
+    enqueue_on_popup(R.string.enqueue_on_popup, (fragment, item) ->
+            NavigationHelper.enqueueOnPopupPlayer(fragment.getContext(), new SinglePlayQueue(item), false)),
+
+    start_here_on_background(R.string.start_here_on_background, (fragment, item) ->
+            NavigationHelper.playOnBackgroundPlayer(fragment.getContext(), new SinglePlayQueue(item), true)),
+
+    start_here_on_popup(R.string.start_here_on_popup, (fragment, item) ->
+            NavigationHelper.playOnPopupPlayer(fragment.getContext(), new SinglePlayQueue(item), true)),
+
+    set_as_playlist_thumbnail(R.string.set_as_playlist_thumbnail, (fragment, item) -> {}), // has to be set manually
+
+    delete(R.string.delete, (fragment, item) -> {}), // has to be set manually
+
+    append_playlist(R.string.append_playlist, (fragment, item) -> {
+        if (fragment.getFragmentManager() != null) {
+            PlaylistAppendDialog.fromStreamInfoItems(Collections.singletonList(item))
+                    .show(fragment.getFragmentManager(), "StreamDialogEntry@append_playlist");
+        }}),
+
+    share(R.string.share, (fragment, item) ->
+            ShareUtils.shareUrl(fragment.getContext(), item.getName(), item.getUrl()));
+
+
+    ///////////////
+    // variables //
+    ///////////////
+
+    public interface StreamDialogEntryAction {
+        void onClick(Fragment fragment, final StreamInfoItem infoItem);
+    }
+
+    private final int resource;
+    private StreamDialogEntryAction action;
+
+    private static StreamDialogEntry[] enabledEntries;
+
+
+    ///////////////////////////////////////////////////////
+    // non-static methods to initialize and edit entries //
+    ///////////////////////////////////////////////////////
+
+    StreamDialogEntry(final int resource, StreamDialogEntryAction action) {
+        this.resource = resource;
+        this.action = action;
+    }
+
+    public void setAction(StreamDialogEntryAction action) {
+        this.action = action;
+    }
+
+
+    ////////////////////////////////////////////////
+    // static methods that act on enabled entries //
+    ////////////////////////////////////////////////
+
+    public static void setEnabledEntries(StreamDialogEntry... entries) {
+        enabledEntries = entries;
+    }
+
+    public static String[] getCommands(Context context) {
+        String[] commands = new String[enabledEntries.length];
+        for (int i = 0; i != enabledEntries.length; ++i) {
+            commands[i] = context.getResources().getString(enabledEntries[i].resource);
+        }
+
+        return commands;
+    }
+
+    public static void clickOn(int which, Fragment fragment, StreamInfoItem infoItem) {
+        enabledEntries[which].action.onClick(fragment, infoItem);
+    }
+}