Improved code for changing theme

app/src/main/res/values/settings_keys.xml

@@ -29,10 +29,12 @@
     <string-array name="theme_description_list">
         <item>@string/light_theme_title</item>
         <item>@string/dark_theme_title</item>
+        <item>@string/black_theme_title</item>
     </string-array>
     <string-array name="theme_list">
         <item>@string/light_theme_title</item>
         <item>@string/dark_theme_title</item>
+        <item>@string/black_theme_title</item>
     </string-array>
 
     <string name="default_audio_format_key" translatable="false">default_audio_format</string>

app/src/main/res/values/strings.xml

@@ -49,6 +49,7 @@
     <string name="light_theme_title">Light</string>
     <string name="dark_theme_title">Dark</string>
     <string name="black_theme_title">Black</string>
+    <string name="theme_applied_message">Theme will be applied on next launch.</string>
 
     <string name="download_dialog_title">Download</string>
     <string-array name="download_options">

app/src/main/res/values/styles.xml

@@ -49,6 +49,10 @@
         <item name="rss">@drawable/ic_rss_feed_black_24dp</item>
     </style>
 
+    <style name="BlackTheme" parent="DarkTheme">
+        <item name="android:windowBackground">@color/black</item>
+    </style>
+
     <style name="NewPipeActionbarTheme" parent="Widget.AppCompat.Light.ActionBar.Solid">
         <item name="android:displayOptions">showHome</item>
         <item name="displayOptions">showHome</item>
@@ -107,6 +111,11 @@
         <item name="windowNoTitle">true</item>
     </style>
 
+    <style name="BlackTheme.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
+
     <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
 
     <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />