How to handle button clicks on notification for playing media in service using media session

gistfile1.java

// Took forever because of crappy tutorials, for example https://developer.android.com/guide/topics/media-apps/audio-app/building-a-mediabrowserservice.html
// Key information was in COMMENTS in MediaButtonReceiver.java
// The key is to have a receiver with filter android.intent.action.MEDIA_BUTTON AND in the service

// register pending intent to the button in notification
builder.addAction(new NotificationCompat.Action(
        R.drawable.ic_skip_next_black_24dp, getString(R.string.skip_next),
        MediaButtonReceiver.buildMediaButtonPendingIntent(this, PlaybackStateCompat.ACTION_SKIP_TO_NEXT)));

// manifest changes
<service
    android:name=".PlayerService">
    <intent-filter>
        <action android:name="android.intent.action.MEDIA_BUTTON" />
        <action android:name="android.media.browse.MediaBrowserService" />
    </intent-filter>
</service>
<receiver android:name="android.support.v4.media.session.MediaButtonReceiver">
    <intent-filter>
        <action android:name="android.intent.action.MEDIA_BUTTON" />
    </intent-filter>
</receiver>

// in onStartCommand of the service
MediaButtonReceiver.handleIntent(mediaSessionCompat, intent);

// THEN you will be able to listen for events from setCallback when media session was created
mediaSessionCompat.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS | MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
playbackStateBuilder = new PlaybackStateCompat.Builder();
playbackStateBuilder.setActions(PlaybackStateCompat.ACTION_PLAY); // add more actions here, like skip next, previous, etc
mediaSessionCompat.setPlaybackState(playbackStateBuilder.build());
mediaSessionCompat.setCallback(mediaSessionCallback); // this won't listen without the manifest additions
mediaSessionCompat.setActive(true);

Thanks a lot! I was banging my head against the wall b/c I didn't know what I missed. But thanks to this snippet I got it working now :D

Thanks worked when I followed this.