关于关闭背景音乐的feature,可以在对应的APP中添加如下代码： 

 AudioManager manager=(AudioManager)getSystemService(AUDIO_SERVICE); 

 // acquire the audio system service 

 manager.setStreamVolume(AudioManager.STREAM_MUSIC, 0, 0);//set volume of music stream  

 播放tone音可以通过如下方法： 

 Uri ring = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);  

 //acquire the uri of ringtone 

 Ringtone ringtone=RingtoneManager.getRingtone(this, ring);  

 ringtone.play();//start to play