Android判断Service是否运行

/**
	    * 用来判断服务是否运行.
	    * @param context
	    * @param className 判断的服务名字
	    * @return true 在运行 false 不在运行
	    */
	   public static boolean isServiceRunning(Context mContext,String className) {
	       boolean isRunning = false;
ActivityManager activityManager = (ActivityManager)
mContext.getSystemService(Context.ACTIVITY_SERVICE); 
	       List<ActivityManager.RunningServiceInfo> serviceList 
	       = activityManager.getRunningServices(30);
	      if (!(serviceList.size()>0)) {
	           return false;
	       }
	       for (int i=0; i<serviceList.size(); i++) {
	           if (serviceList.get(i).service.getClassName().equals(className) == true) {
	               isRunning = true;
	               break;
	           }
	       }
	       return isRunning;
	   }