Android Example: RingtoneManager (via http://goo.gl/k3PpyG)

final RingtoneManager manager = new RingtoneManager(this);
manager.setType(RingtoneManager.TYPE_ALL);
ringtone = manager.getRingtone(manager.getRingtonePosition(Uri.parse(s)));
if (ringtone == null) {
    return;
}