protected void onCreate(android.os.Bundle savedInstanceState) {                        
super.onCreate(savedInstanceState);                                                
// 首先加大音量                                                                          
AudioManager audiomanager = (AudioManager) getSystemService(Service.AUDIO_SERVICE);
audiomanager.setMode(AudioManager.MODE_NORMAL);                                    
audiomanager.setStreamVolume(AudioManager.STREAM_MUSIC,                            
audiomanager.getStreamMaxVolume(AudioManager.STREAM_MUSIC), 0);            
audiomanager.adjustVolume(AudioManager.ADJUST_RAISE, 0);                           
// 播放raw里面的mp3文件                                                                   
MediaPlayer mediaPlayer = MediaPlayer.create(getApplicationContext(),              
R.raw.a);                                                                  
try {                                                                              
                                                                                       
mediaPlayer.prepare();                                                         
mediaPlayer.setLooping(true);                                                  
mediaPlayer.start();                                                           
} catch (IllegalStateException e) {                                                
// TODO Auto-generated catch block                                             
e.printStackTrace();                                                           
} catch (IOException e) {                                                          
// TODO Auto-generated catch block                                             
e.printStackTrace();                                                           
}                                                                                  
                                                                                       
};