Audio Manager onAudioFocusChange() not firing when notification arrives

Question

I want to perform some action before a notification sound occurs. After some googling I found out that OnAudioFocusChangeListener is the way to go. I made my service implement AudioManager.OnAudioFocusChangeListener but the method onAudioFocusChange() is never called.

public void onAudioFocusChange(int focusChange) {
        Log.d(LOG_TAG, "Called!");
        if(focusChange == AudioManager.AUDIOFOCUS_GAIN){
              // Do STuff
        }
}

Can someone please help me, any advice is appreciated !!

Answer 1

AudioManager.OnAudioFocusChangeListener must be registered to your AudioManager in order to be called properly.

//get the audiomanager
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);


    //create the listener
      audioFocusListener=new AudioManager.OnAudioFocusChangeListener() {
                @Override
                public void onAudioFocusChange(int focusChange) {
    
                    // do your job here
                    if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT) {
    
                    } else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
    
                    } else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
                       
    
                    }
                }
            };
    
    //register the listener
    audioManager.requestAudioFocus(audioFocusListener,
                            AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
    
    //later unregister it when you do not need it anymore
    AppContext.audioManager.abandonAudioFocus(audioFocusListener);

You can try this out with e.g. the Youtube app, that will trigger this listener.

Edit

NotificationListenerService

AndroidManifest.xml

<service
    android:name=".NotificationListenerService"
    android:label="@string/app_name"
    android:enabled="true"
    android:exported="true"
    android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
    <intent-filter>
        <action android:name="android.service.notification.NotificationListenerService" />
    </intent-filter>
</service>

NotificationListenerService.java:

public class NotificationListenerService extends android.service.notification.NotificationListenerService {
    private static final String TAG = "NotificationListenerService";
    public NotificationListenerService(){}
    @Override
    public void onNotificationPosted(StatusBarNotification sbn) {
       // do your job
    } 



}

To enable the listener you can go to:

Settings >  Sound & Notification > Notification Access > App > Enable

or call this from your app:

  Intent i=new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");
                    startActivity(i);