Android: MediaPlayer onPrepared is not being called

android, media-player, prepare

Solution

It's because you are creating a new `MediaPlayer` object. This one does not have any `onPreparededListener` set on it.

Here you create and assign a `MediaPlayer` object:

mediaPlayer = new MediaPlayer();

Next you set an `onPreparedListener` on it.

But then you create and assign a new one! This assignment overrides your previous lines.

mediaPlayer = MediaPlayer.create(this, R.raw.my_sound_mp3);

This one has no `onPreparedListener` set on it.

To fix, don't use the `create` method, use `setDataSource` instead

AssetFileDescriptor afd = context.getResources().openRawResourceFd(R.raw.my_sound_mp3);
MediaPlayer 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.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
afd.close();
mediaPlayer.prepare();

Problem

Original source