android 音乐、铃声播放控制相关问题

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