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;
       }