Android的UDP不能从LAN之外的接收 [英] Android UDP can't receive from outside LAN

问题描述

我的code不能从我的家庭网络之外接收UDP消息。沟通是Android和Java的计算机应用之间，我的局域网内的IP（例如192.168.0.3）在code的作品，如果我把我的Java应用程序的电脑我的在线服务器内（显然我改变每个IP与外部IP地址）这不工作; Android版可以发送，但不能接收。

My code can't receive UDP messages from outside my home net. The communication is between Android and Java computer application, with IP inside my LAN (for example 192.168.0.3) the code works, if I put my Java computer application inside my online server (and obviously I changed every IP with external IPs) this doesn't work; Android can send but it can't receive.

Android的code：

Android code :

@Override
protected Integer doInBackground(Void... params) {
    DatagramSocket socket = null;
    byte[] buf = new byte[1024];
    DatagramPacket packet = new DatagramPacket(buf, buf.length);
    try {
        socket = new DatagramSocket(25565);
    } catch (Exception e) {
        Log.i("Ex ", "");
    }
    while (true) {
        try {
            socket.receive(packet);
            String message = new String(packet.getData(), 0,packet.getLength());
            Log.i("message", "" + message);
        } catch (IOException e) {
            Log.i("IO Ex", "");
        }
        catch (Exception e){
        }
    }
}

Java的计算机应用code：
http://pastebin.com/2hVGeP6R

推荐答案

设置为192.168.0.X，是一个内部NAT地址。任何网络可以使用它，但是它不能被从任何地方外到达。你要么需要配置你的路由器，通过将它传递到您的PC和命中路由器的外部IP，或者你需要一个真正的网络地址。

192.168.0.X is an internal NAT address. Any network can use it, but it can't be reached from anywhere outside. You either need to configure your router to pass it through to your PC and hit the router's external IP, or you need a real network address.

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