Loading screen until media player starts

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Mobile

Android

I have written a streaming music app using the media player class in a service. I call the service from the main class to start or stop the music. When I press "play" the music doesn't start instantly ( music is streamed, this is why loading animation is needed ).Other then the 5-10 sec wait time the app works fine. I know that it's streaming, and buffering and that takes time so I've decided to implement a loading animation. My problem is: I start the loading animation, but when do I stop it. How do I know that the music is playing? Note that when mediaplayer.start() is called music doesn't play instantly and after that call if I call the method isPlaying() it returns true, but you still can't hear the music.

My code:

private void buttonPlayClick() {
                startScroll();
        buttonPlay.setImageResource(R.drawable.mp_play_hover);
        startService(playbackServiceIntent);
    }

Service:

public int onStartCommand(Intent intent, int flags, int startId) {
    if (!mediaPlayer.isPlaying()) {
        mediaPlayer.start();
        super.onCreate();
    }
    return START_STICKY;
}

onCreate()
{
mediaPlayer = new MediaPlayer();
    try {
        mediaPlayer
                .setDataSource("xyz");
    } catch (IllegalArgumentException e) {

    } catch (IllegalStateException e) {

    } catch (IOException e) {

    }
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    try {
        mediaPlayer.prepare();
    } catch (IllegalStateException e) {

    } catch (IOException e) {

    } // MediaPlayer starts to load data from URL 
    mediaPlayer.setOnCompletionListener(this);
    notifyMe();
 }