简单播放系统提示音 android

//Uri alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
//alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
//alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
                        



	Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
					Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
					r.play(); 


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