Fixed a situation when background playback could use a video stream instead of an audio stream

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

@@ -2164,10 +2164,10 @@ public class VideoDetailFragment
             @Override
             public void onStateChanged(@NonNull final View bottomSheet, final int newState) {
                 bottomSheetState = newState;
-                ViewGroup mainFragment = requireActivity().findViewById(R.id.fragment_holder);
+                final ViewGroup mainFragment = requireActivity().findViewById(R.id.fragment_holder);
-
                 switch (newState) {
                     case BottomSheetBehavior.STATE_HIDDEN:
+                        mainFragment.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
                         bottomSheetBehavior.setPeekHeight(0);
                         cleanUp();
                         break;

app/src/main/java/org/schabi/newpipe/player/VideoPlayerImpl.java

@@ -187,6 +187,7 @@ public class VideoPlayerImpl extends VideoPlayer
     private boolean audioOnly = false;
     private boolean isFullscreen = false;
     private boolean isVerticalVideo = false;
+    private boolean fragmentIsVisible = false;
     boolean shouldUpdateOnProgress;
     int timesNotificationUpdated;
 
@@ -1224,28 +1225,22 @@ public class VideoPlayerImpl extends VideoPlayer
                 break;
             case ACTION_PLAY_PAUSE:
                 onPlayPause();
+                if (!fragmentIsVisible) {
+                    // Ensure that we have audio-only stream playing when a user
+                    // started to play from notification's play button from outside of the app
+                    onFragmentStopped();
+                }
                 break;
             case ACTION_REPEAT:
                 onRepeatClicked();
                 break;
             case VideoDetailFragment.ACTION_VIDEO_FRAGMENT_RESUMED:
+                fragmentIsVisible = true;
                 useVideoSource(true);
                 break;
             case VideoDetailFragment.ACTION_VIDEO_FRAGMENT_STOPPED:
-                // This will be called when user goes to another app/activity, turns off a screen.
+                fragmentIsVisible = false;
-                // We don't want to interrupt playback and don't want to see notification
+                onFragmentStopped();
-                // if player is stopped.
-                // Next lines of code will enable background playback if needed
-                if (videoPlayerSelected() && (isPlaying() || isLoading())) {
-                    if (backgroundPlaybackEnabled()) {
-                        useVideoSource(false);
-                    } else if (minimizeOnPopupEnabled()) {
-                        setRecovery();
-                        NavigationHelper.playOnPopupPlayer(getParentActivity(), playQueue, true);
-                    } else {
-                        onPause();
-                    }
-                }
                 break;
             case Intent.ACTION_CONFIGURATION_CHANGED:
                 assureCorrectAppLanguage(service);
@@ -1998,6 +1993,7 @@ public class VideoPlayerImpl extends VideoPlayer
 
     public void setFragmentListener(final PlayerServiceEventListener listener) {
         fragmentListener = listener;
+        fragmentIsVisible = true;
         updateMetadata();
         updatePlayback();
         triggerProgressUpdate();
@@ -2072,6 +2068,24 @@ public class VideoPlayerImpl extends VideoPlayer
         }
     }
 
+    /**
+     * This will be called when a user goes to another app/activity, turns off a screen.
+     * We don't want to interrupt playback and don't want to see notification so
+     * next lines of code will enable audio-only playback only if needed
+     * */
+    private void onFragmentStopped() {
+        if (videoPlayerSelected() && (isPlaying() || isLoading())) {
+            if (backgroundPlaybackEnabled()) {
+                useVideoSource(false);
+            } else if (minimizeOnPopupEnabled()) {
+                setRecovery();
+                NavigationHelper.playOnPopupPlayer(getParentActivity(), playQueue, true);
+            } else {
+                onPause();
+            }
+        }
+    }
+
     ///////////////////////////////////////////////////////////////////////////
     // Getters
     ///////////////////////////////////////////////////////////////////////////