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;
}