监控 URL 是否在 Android 持续在线

Question

我想创建 URL 监视器，如果 URL 在线，它将在后台每隔 x 秒进行一次监视。

ConnectivityManager 对我不利，因为我的应用程序是在受控环境中使用的，尽管互联网可以正常工作，但某些端口需要关闭。

所以我需要监控foo.com/9000是否一直在线，当我请求isOnline时，我想立即得到结果，所以监控应该在后台进行。

我将如何完成此操作，是否有可以执行此操作的库？

在 Actionscript 中我会调用 UrlMonitor 并传递它 url

Answer 1

你能用它来重复这个任务吗： Repeat a task with a time delay?

这是任务：

HttpGet request = new HttpGet();
URI uri = new URI("your_url");
request.setURI(uri);
HttpResponse response = httpClient.execute(request);
if (response.getStatusLine().toString().equalsIgnoreCase("HTTP/1.1 200 OK")) {
    // it's there
}

Answer 2

private static boolean internetConnectionAvailable;
private static ScheduledExecutorService scheduleTaskExecutor;


public static void stopInternetMonitor() {
    if (scheduleTaskExecutor != null && !scheduleTaskExecutor.isShutdown()) {
        scheduleTaskExecutor.shutdown();
    }
}

public static void startInternetMonitor() {
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            isInternetConnectionAvailableSync();
        }
    };

    if (scheduleTaskExecutor != null) {
        if (scheduleTaskExecutor.isShutdown()) {
            scheduleTaskExecutor.scheduleWithFixedDelay(runnable, 0, 30, TimeUnit.SECONDS);
        }
    } else {
        scheduleTaskExecutor = Executors.newScheduledThreadPool(5);
        scheduleTaskExecutor.scheduleWithFixedDelay(runnable, 0, 30, TimeUnit.SECONDS);
    }
}

public static boolean isInternetConnectionAvailableCached() {

    ConnectivityManager cm = (ConnectivityManager) FashionTrenderApplication.getInstance()
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected() && internetConnectionAvailable) {
        return true;
    }

    return false;
}

public static boolean isInternetConnectionAvailableSync() {
    ConnectivityManager cm = (ConnectivityManager) FashionTrenderApplication.getInstance()
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected()) {
        try {
            URL url = new URL(EnvironmentConfiguration.getInstance().getServerUrl());
            HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
            urlc.setRequestProperty("User-Agent", "test");
            urlc.setRequestProperty("Connection", "close");
            urlc.setConnectTimeout(1000); // mTimeout is in seconds
            urlc.connect();
            if (urlc.getResponseCode() == 200) {
                internetConnectionAvailable = true;
                return true;
            } else {
                internetConnectionAvailable = false;
                return false;
            }
        } catch (IOException e) {
            Log.i("warning", "Error checking internet connection", e);
            return false;
        }
    }

    return false;
}

监控 URL 是否在 Android 持续在线

Monitor if URL is online constantly in Android

java

url

android