How to play ringtone sound in Android with infinite loop?

It seems the simplest way is to create a MediaPlayer from the Uri returned from RingtoneManager, and set it to loop.

Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
MediaPlayer player = MediaPlayer.create(this, notification);
player.setLooping(true);
player.start();

By using setLooping(true) you can achieve this:

Uri alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
mMediaPlayer.setDataSource(this, alert);
mMediaPlayer.setLooping(true);
mMediaPlayer.prepare();
mMediaPlayer.start();