在android中获取系统在运行的进程

 public String getRunningProcesses(){    	ActivityManager _ActivityManager = (ActivityManager) this .getSystemService(Context.ACTIVITY_SERVICE); //获取系统的全局状态    	      List<RunningAppProcessInfo> list = _ActivityManager .getRunningAppProcesses(); //获得系统正在运行的进程    	int i = list.size();     	Log.i("tag", String.valueOf(i));     	for (int j = 0; j < list.size(); j++)     	{              Log.i("tag", list.get(j).processName);    	      }    	return serviceInfo.toString();}