android 判断service是不是正在运行

public static boolean isServiceExisted(Context context, String className) {        ActivityManager activityManager = (ActivityManager) context                .getSystemService(Context.ACTIVITY_SERVICE);        List<ActivityManager.RunningServiceInfo> serviceList = activityManager                .getRunningServices(Integer.MAX_VALUE);        if (!(serviceList.size() > 0)) {            return false;        }        for (int i = 0; i < serviceList.size(); i++) {            RunningServiceInfo serviceInfo = serviceList.get(i);            ComponentName serviceName = serviceInfo.service;            if (serviceName.getClassName().equals(className)) {                return true;            }        }        return false;    }