Fix broken mute

It should play video with mute on even though another app is playing audio.

Author: eubnara

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

@@ -1345,7 +1345,34 @@ public void toggleShuffleModeEnabled() {
 
     public void toggleMute() {
         final boolean wasMuted = isMuted();
+        final boolean wasPlaying = simpleExoPlayer.isPlaying();
+        Log.d(TAG, "toggleMute: wasMuted=" + wasMuted + ", wasPlaying=" + wasPlaying);
         simpleExoPlayer.setVolume(wasMuted ? 1 : 0);
+        if (wasMuted) {
+            Log.d(TAG, "toggleMute: enabling audio focus, willPlay=" + wasPlaying);
+            simpleExoPlayer.setAudioAttributes(
+                new com.google.android.exoplayer2.audio.AudioAttributes.Builder()
+                    .setUsage(C.USAGE_MEDIA)
+                    .setContentType(C.AUDIO_CONTENT_TYPE_MUSIC)
+                    .build(),
+                true  // handleAudioFocus = true - ExoPlayer handles focus automatically
+            );
+            if (wasPlaying) {
+                Log.d(TAG, "toggleMute: calling play(), isPlaying=" + simpleExoPlayer.isPlaying());
+                simpleExoPlayer.play();
+                Log.d(TAG, "toggleMute: after play(), isPlaying=" + simpleExoPlayer.isPlaying());
+            }
+        } else {
+            Log.d(TAG, "toggleMute: disabling audio focus, abandoning focus");
+            simpleExoPlayer.setAudioAttributes(
+                new com.google.android.exoplayer2.audio.AudioAttributes.Builder()
+                    .setUsage(C.USAGE_MEDIA)
+                    .setContentType(C.AUDIO_CONTENT_TYPE_MUSIC)
+                    .build(),
+                false  // handleAudioFocus = false
+            );
+            audioReactor.abandonAudioFocus();
+        }
         UIs.call(playerUi -> playerUi.onMuteUnmuteChanged(!wasMuted));
         notifyPlaybackUpdateToListeners();
     }

app/src/main/java/org/schabi/newpipe/player/helper/AudioReactor.java

@@ -4,9 +4,11 @@
 import android.content.Intent;
 import android.media.AudioManager;
 import android.media.audiofx.AudioEffect;
+import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.core.content.ContextCompat;
+import androidx.media.AudioFocusRequestCompat;
 import androidx.media.AudioManagerCompat;
 
 import com.google.android.exoplayer2.ExoPlayer;
@@ -16,25 +18,48 @@ public class AudioReactor implements AnalyticsListener {
 
     private static final String TAG = "AudioFocusReactor";
 
+    private static final int FOCUS_GAIN_TYPE = AudioManagerCompat.AUDIOFOCUS_GAIN;
     private static final int STREAM_TYPE = AudioManager.STREAM_MUSIC;
 
     private final ExoPlayer player;
     private final Context context;
     private final AudioManager audioManager;
+    private final AudioFocusRequestCompat request;
 
     public AudioReactor(@NonNull final Context context,
                         @NonNull final ExoPlayer player) {
         this.player = player;
         this.context = context;
         this.audioManager = ContextCompat.getSystemService(context, AudioManager.class);
         player.addAnalyticsListener(this);
+
+        request = new AudioFocusRequestCompat.Builder(FOCUS_GAIN_TYPE)
+                .setWillPauseWhenDucked(true)
+                .setOnAudioFocusChangeListener(focusChange -> {
+                })
+                .build();
     }
 
     public void dispose() {
+        abandonAudioFocus();
         player.removeAnalyticsListener(this);
         notifyAudioSessionUpdate(false, player.getAudioSessionId());
     }
 
+    /*//////////////////////////////////////////////////////////////////////////
+    // Audio Focus
+    //////////////////////////////////////////////////////////////////////////*/
+
+    public void requestAudioFocus() {
+        Log.d(TAG, "requestAudioFocus() called");
+        AudioManagerCompat.requestAudioFocus(audioManager, request);
+    }
+
+    public void abandonAudioFocus() {
+        Log.d(TAG, "abandonAudioFocus() called");
+        AudioManagerCompat.abandonAudioFocusRequest(audioManager, request);
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // Audio Manager
     //////////////////////////////////////////////////////////////////////////*/