title: Android: MediaPlayer onPrepared is not being called
body: <p>As title says, the onPrepared() overridden method is not being called.</p>
  
  <pre><code>mediaPlayer = new MediaPlayer();
  mediaPlayer.setOnPreparedListener(new OnPreparedListener(){
     @Override
     public void onPrepared(MediaPlayer mp){
        if (mp.equals(mediaPlayer)) isReady_mediaPlayer = true;
  
        Log.e("I", "Media player has been loaded to memory !");
     }
  });
  
  mediaPlayer = MediaPlayer.create(this, R.raw.my_sound_mp3);
  </code></pre>