android判斷某服務是否正在後台運行

 /**
        * 用來判斷服務是否後台運行
        * @param context
        * @param className 判斷的服務名字
        * @return true 在運行 false 不在運行
        */
       public static boolean isServiceRunning(Context mContext,String className) {
           booleanV 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 ;
       }