具有Java的Android应用程序-udp字符串不发送 [英] Android application with Java - udp string doesn't send

问题描述

我已经开始在android studio上使用JAVA，并且我正在尝试创建一个简单的应用程序，该应用程序将向我的服务器发送一个udp字符串.

I have started working with JAVA on android studio and I'm trying to create a simple application that will send to my server a udp string.

一切似乎都在应用程序中正常工作(当我按下按钮时，我可以看到它被按下了，而当我使用android studio进行调试时-该功能正在起作用，我没有任何异常).

Everything seems to be working in the application (when I press the button I can see it been pressed , and when I use android studio and debug - the function is working, I don't get any exceptions).

我已经检查过并且我的服务器正在侦听该端口(其他应用程序正在发送到该端口-并且正在运行).

I have checked and my server is listening to the port (other applications are sending to this port - and it's working).

但是我不认为应用程序正在发送它.

But I don't think the application is sending to it.

这就是我所拥有的:

btnAction.setOnClickListener(new View.OnClickListener() {
    @override
    public void onClick(View v) {
        try {
            String messageStr = "test!";
            int server_port = 1111;
            DatagramSocket s = new DatagramSocket();
            InetAddress local = InetAddress.getByName("My.Public.Server.IP");
            int msg_length = messageStr.length();
            byte[] message = messageStr.getBytes();
            DatagramPacket p = new DatagramPacket(message, msg_length, local,server_port);
            s.send(p);
        } catch (Exception e) {
        }
    }
}

有什么想法吗?

谢谢.

推荐答案

1. 您必须在清单< uses-permission android:name ="android.permission.INTERNET"/>
中具有互联网许可
2. 您必须在其他线程(而不是主线程)中运行与网络相关的任务

您的代码如下:

btnAction.setOnClickListener(new View.OnClickListener() {
    @override
    public void onClick(View v) {
        new Thread("thread_udp"){
            public void run(){
                try {
                    String messageStr = "test!";
                    int server_port = 1111;
                    DatagramSocket s = new DatagramSocket();
                    InetAddress local = InetAddress.getByName("My.Public.Server.IP");
                    int msg_length = messageStr.length();
                    byte[] message = messageStr.getBytes();
                    DatagramPacket p = new DatagramPacket(message, msg_length, local,server_port);
                    s.send(p);
                } catch (Exception e) {
                    e.printStackTrace()
                }
            }
        }.start()

    }
}

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