安卓退出程序

for (Activity activity : activitys) {
			activity.finish(); 
		}
		
		stopService( new Intent(this , MusicService.class )) ;  
		
		Intent intent = new Intent(Intent.ACTION_MAIN);   
		intent.addCategory(Intent.CATEGORY_HOME);
		intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  
		startActivity(intent);  
		android.os.Process.killProcess( Process.myPid() );   
		System.exit(0);