Android 檢查服務是否在運行

private Boolean isServiceRunning(String serviceName) {

         ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
            for (RunningServiceInfo runningServiceInfo : activityManager.getRunningServices(Integer.MAX_VALUE)) {
                if (serviceName.equals(runningServiceInfo.service.getClassName())) {
                    return true;
                }
            }
            return false;
    }