@Override
public void onPrepared(MediaPlayer mp) {
    try{
        mediaPlayer.setDisplay(surfaceHolder);
        mediaPlayer.start();
        videoControllerView.start();
        layoutProgressBar.setVisibility(View.INVISIBLE);
        RequestsRB.putStartWatchingVideo(this, mCourseId, mToken, mLessons.get(currentVideoNum).getId());
    }catch (Exception e){
        Log.e("WatchVideoActivity=onPrepared", "ERRROR" + "");
        if (mediaPlayer==null) Log.e("WatchVideoActivity=onPrepared", "DA1" + "");
        if (mp==null) Log.e("WatchVideoActivity=onPrepared", "DA2" + "");
    }
}