Question

I have several activities which use several audio features. For that, I have a MediaPlayer in a singleton java class, so the activities interact with that class and just exist on the media player.

One of the features is to stop automatically the media player after X minutes. So I created a timer in the singleton class and stops perfectly the radio streaming. the problem is that there is no feedback or callback to the running activity. There is a play/stop button wich has to change the image and I do not know how can I capture that onStop event or whatever….or can be called from a single java class the current activity class running, so I could call a function of the activity in order to change the image?

Answer 1

You probably want to use a broadcast receiver for this.

From your singlton class which does the stopping, when your timer stops the music, call this method:

public void broadcastMusicPaused(View v){
    Intent broadcast = new Intent();
    broadcast.setAction("MUSIC_STOPPED");
    sendBroadcast(broadcast);
}

Then, from your controlling activity, set up your receiver like this:

private BroadcastReceiver receiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "Music Paused", Toast.LENGTH_SHORT).show();
        displayMusicStopped();       //switches images
    }
};

@Override
protected void onResume() {
    IntentFilter filter = new IntentFilter();
    filter.addAction("MUSIC_STOPPED");
    registerReceiver(receiver, filter);

    super.onResume();
}

@Override
protected void onPause() {
    unregisterReceiver(receiver);
    super.onPause();
}