android 判断服务是否运行

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;
	}