Enhancements to background playback and media button handling

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

@@ -21,6 +21,7 @@ import androidx.annotation.Nullable;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.PlaybackParameters;
+import com.google.android.exoplayer2.Player;
 import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.bottomsheet.BottomSheetBehavior;
 import com.google.android.material.tabs.TabLayout;
@@ -237,9 +238,8 @@ public class VideoDetailFragment
 
                 if (!player.videoPlayerSelected()) return;
 
-                if (currentInfo == null && !wasCleared()) selectAndLoadVideo(serviceId, url, name, playQueue);
-
-                if (player.getPlayQueue() != null) addVideoPlayerView();
+                // STATE_IDLE means the player is stopped
+                if (player.getPlayer() != null && player.getPlayer().getPlaybackState() != Player.STATE_IDLE) addVideoPlayerView();
 
                 // If the video is playing but orientation changed let's make the video in fullscreen again
 
@@ -375,7 +375,7 @@ public class VideoDetailFragment
             updateFlags = 0;
         }
 
-        // Check if it was loading when the fragment was stopped/paused,
+        // Check if it was loading when the fragment was stopped/paused
         if (wasLoading.getAndSet(false) && !wasCleared()) {
             selectAndLoadVideo(serviceId, url, name, playQueue);
         } else if (currentInfo != null) {
@@ -537,7 +537,7 @@ public class VideoDetailFragment
                 bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                 break;
             case R.id.overlay_play_pause_button:
-                if (player != null) {
+                if (player != null && player.getPlayer() != null && player.getPlayer().getPlaybackState() != Player.STATE_IDLE) {
                     player.onPlayPause();
                     player.hideControls(0,0);
                     showSystemUi();
@@ -900,9 +900,9 @@ public class VideoDetailFragment
     }
 
     private void setupFromHistoryItem(StackItem item) {
+        setAutoplay(false);
         hideMainPlayer();
 
-        setAutoplay(false);
         selectAndLoadVideo(
                 item.getServiceId(),
                 item.getUrl(),
@@ -1107,7 +1107,7 @@ public class VideoDetailFragment
             return;
 
         removeVideoPlayerView();
-        playerService.stop();
+        playerService.stop(isAutoplayEnabled());
         playerService.getView().setVisibility(View.GONE);
     }
 

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

@@ -113,6 +113,10 @@ public final class MainPlayer extends Service {
     public int onStartCommand(Intent intent, int flags, int startId) {
         if (DEBUG) Log.d(TAG, "onStartCommand() called with: intent = [" + intent +
                 "], flags = [" + flags + "], startId = [" + startId + "]");
+
+        if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction()) || intent.getStringExtra(VideoPlayer.PLAY_QUEUE_KEY) != null)
+            showNotificationAndStartForeground();
+
         playerImpl.handleIntent(intent);
         if (playerImpl.mediaSessionManager != null) {
             playerImpl.mediaSessionManager.handleMediaButtonIntent(intent);
@@ -120,15 +124,20 @@ public final class MainPlayer extends Service {
         return START_NOT_STICKY;
     }
 
-    public void stop() {
-        if (DEBUG)
-            Log.d(TAG, "stop() called");
+    public void stop(boolean autoplayEnabled) {
+        if (DEBUG) Log.d(TAG, "stop() called");
 
         if (playerImpl.getPlayer() != null) {
             playerImpl.wasPlaying = playerImpl.getPlayer().getPlayWhenReady();
-            // We can't pause the player here because it will make transition from one stream to a new stream not smooth
+            // Releases wifi & cpu, disables keepScreenOn, etc.
+            if (!autoplayEnabled) playerImpl.onPause();
+            // We can't just pause the player here because it will make transition from one stream to a new stream not smooth
             playerImpl.getPlayer().stop(false);
             playerImpl.setRecovery();
+            // Notification shows information about old stream but if a user selects a stream from backStack it's not actual anymore
+            // So we should hide the notification at all.
+            // When autoplay enabled such notification flashing is annoying so skip this case
+            if (!autoplayEnabled) stopForeground(true);
         }
     }
 
@@ -211,6 +220,15 @@ public final class MainPlayer extends Service {
         }
     }
 
+    private void showNotificationAndStartForeground() {
+        resetNotification();
+        if (getBigNotRemoteView() != null)
+            getBigNotRemoteView().setProgressBar(R.id.notificationProgressBar, 100, 0, false);
+        if (getNotRemoteView() != null)
+            getNotRemoteView().setProgressBar(R.id.notificationProgressBar, 100, 0, false);
+        startForeground(NOTIFICATION_ID, getNotBuilder().build());
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // Notification
     //////////////////////////////////////////////////////////////////////////*/

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

@@ -189,12 +189,6 @@ public class VideoPlayerImpl extends VideoPlayer
             reload();
         }
 
-        service.resetNotification();
-        if (service.getBigNotRemoteView() != null)
-            service.getBigNotRemoteView().setProgressBar(R.id.notificationProgressBar, 100, 0, false);
-        if (service.getNotRemoteView() != null)
-            service.getNotRemoteView().setProgressBar(R.id.notificationProgressBar, 100, 0, false);
-        service.startForeground(NOTIFICATION_ID, service.getNotBuilder().build());
         setupElementsVisibility();
 
         if (audioPlayerSelected()) {
@@ -1167,7 +1161,7 @@ public class VideoPlayerImpl extends VideoPlayer
     public void checkLandscape() {
         AppCompatActivity parent = getParentActivity();
         if (parent != null && service.isLandscape() != isInFullscreen()
-                && getCurrentState() != STATE_COMPLETED && videoPlayerSelected())
+                && getCurrentState() != STATE_COMPLETED && videoPlayerSelected() && !audioOnly)
             toggleFullscreen();
     }
 
@@ -1197,6 +1191,8 @@ public class VideoPlayerImpl extends VideoPlayer
             return;
 
         audioOnly = !video;
+        // When a user returns from background controls could be hidden but systemUI will be shown 100%. Hide it
+        if (!audioOnly && !isControlsVisible()) hideSystemUIIfNeeded();
         setRecovery();
         reload();
     }