检查服务器端口是否打开或未使用ThreadPoolExecutor时，Android应用程序已挂起并显示黑屏5-6秒钟

问题描述

如果服务器端口已打开，我需要运行服务.我通过使用以下方法来做到这一点.

I need to run a service if a server port is open. I am doing this by using below method.

public Future<Boolean> ifPortIsOpenThenStartIridiumService(final Context context, final String device_mac, final String device_imei, final String input_mobile) {
    return Executors.newFixedThreadPool(20).submit(new Callable<Boolean>() {
        @Override
        public Boolean call() {
            try {
                String SERVER_IP = "IP Address";
                int SERVER_PORT = Server_port;
                int DURATION = 1000;

                Socket socket = new Socket();
                socket.connect(new InetSocketAddress(SERVER_IP, SERVER_PORT), DURATION);
                socket.close();

                Log.d(TAG, "Port is Open");

                runIridiumService(context, device_mac, device_imei, input_mobile);

                return true;
            } catch (Exception ex) {
                Log.d(TAG, "Port is not Open");
                CustomToast.showToast(context, "No Internet Access.", "If in flight, please switch to \"Aeroplane Mode\" and connect to the airline's Wi-Fi network.", 1);

                return false;
            }
        }
    });
}

上面的代码正在工作，但是当我运行此方法时，应用程序被挂起，并且黑屏显示5-6秒钟.我在Logcat上找到以下消息.

Above code is working but when I run this method the application is getting hanged and black screen is shown for 5-6 seconds.I found below message on Logcat.

该服务启动后，应用程序运行正常.我如何摆脱这个问题?预先感谢.

After that service is started and application is working well. How can I get rid of this problem?Thanks in advance.

推荐答案

经过研究，据我了解，

Android应用程序已挂起，并在5-6秒钟内显示黑屏，因为

未来-

因此，它等待直到操作完成.您可以从这里获得更多信息.

So, it waits until operation is finished. You can get more info from here.

newFixedThreadPool -

从此处获取更多信息.

您的问题的可能解决方案是使用 ScheduledExecutorService.

The possible solution of your problem is to use ScheduledExecutorService.

在使用

if (YOUR_FUTURE.isDone()){ result = (String) YOUR_FUTURE.get();}

if (YOUR_FUTURE.isDone()){ result = (String) YOUR_FUTURE.get();}

避免不必要的循环或多余的循环.

to avoid unwanted or extra loop.

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