@Override
 public void onStop() {
   super.onStop();
   getActivity().unregisterReceiver(receiver);
   getActivity().unregisterReceiver(mPlayStateReceiver);
   getActivity().unregisterReceiver(completedPlayingReceiver);
   getActivity().unregisterReceiver(trackChangeReceiver);
   getActivity().unregisterReceiver(trackProgressReceiver);
 }
 @Override
 public void onStop() {
   super.onStop();
 }