播放默认铃声

Uri alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);  mMediaPlayer = new MediaPlayer(); mMediaPlayer.setDataSource(this, alert); final AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE); if (audioManager.getStreamVolume(AudioManager.STREAM_ALARM) != 0) {            player.setAudioStreamType(AudioManager.STREAM_ALARM);            player.setLooping(true);            player.prepare();            player.start();  }

会出现 Couldn't open fd for content://settings/system/ringtone但是在真机上是可以的