Android的DatagramSocket的错误消息：EADDRINUSE（地址已在使用） [英] Android DatagramSocket error message: EADDRINUSE (Address already in use)

问题描述

我想编写一个简单的机器人聊天应用程序。我创建了负责处理所有的网络通信服务类。 DatagramSocket的结合是在一个单独的线程。一旦当我得到这个错误和应用程序崩溃：

  java.net.BindException：绑定失败：EADDRINUSE（地址已在使用）
在libcore.io.IoBridge.bind（IoBridge.java:89）
在java.net.PlainDatagramSocketImpl.bind（PlainDatagramSocketImpl.java:68）
在java.net.DatagramSocket.createSocket（DatagramSocket.java:133）
在java.net.DatagramSocket中的＆LT; INIT＆GT;（DatagramSocket.java:78）
 

这是code这prodruces它。在与该行发生错误的新的DatagramSocket 我怎样才能避免这个错误？谢谢你。

 私有类ComThread继承Thread {

        私有静态最终诠释BCAST_PORT = 8779;
        DatagramSocket的mSocket;
        InetAddress类myBcastIP，myLocalIP;

        公共ComThread（）{

            尝试 {
                myBcastIP = getBroadcastAddress（）;
                如果（D）的
                    Log.d（TAG，我的BCAST IP：+ myBcastIP）;

                myLocalIP = getLocalAddress（）;
                如果（D）的
                    Log.d（TAG，我的本地IP：+ myLocalIP）;

                如果（mSocket == NULL）{
                    mSocket =新的DatagramSocket（BCAST_PORT）;
                    mSocket.setReuseAddress（真正的）;
                    mSocket.setBroadcast（真正的）;
                }

            }赶上（IOException异常E）{
                Log.e（TAG，无法建立套接字，E）;
            }
        }
 

解决方案

您需要设置 SO_REUSEADDR 才具有约束力。不要指定在构造函数中港 - 创建未绑定的套接字，而不是用<一个href="http://docs.oracle.com/javase/1.4.2/docs/api/java/net/DatagramSocket.html#DatagramSocket%28java.net.SocketAddress%29"><$c$c>DatagramSocket(null),然后设置选项，然后<一个href="http://docs.oracle.com/javase/1.4.2/docs/api/java/net/DatagramSocket.html#bind%28java.net.SocketAddress%29"><$c$c>bind()明确。

I am trying to write a simple android chat app. I have created a service class which handles all the networking communication. The DatagramSocket binding is in a separate thread. Once in while I am getting this error and the app crashes:

java.net.BindException: bind failed: EADDRINUSE (Address already in use)
at libcore.io.IoBridge.bind(IoBridge.java:89)
at java.net.PlainDatagramSocketImpl.bind(PlainDatagramSocketImpl.java:68)
at java.net.DatagramSocket.createSocket(DatagramSocket.java:133)
at java.net.DatagramSocket.<init>(DatagramSocket.java:78)

and this is the code which prodruces it. The error occur on the line with new DatagramSocket How can I avoid this error? Thank you.

private class ComThread extends Thread {

        private static final int BCAST_PORT = 8779;
        DatagramSocket mSocket;
        InetAddress myBcastIP, myLocalIP;

        public ComThread() {

            try {
                myBcastIP = getBroadcastAddress();
                if (D)
                    Log.d(TAG, "my bcast ip : " + myBcastIP);

                myLocalIP = getLocalAddress();
                if (D)
                    Log.d(TAG, "my local ip : " + myLocalIP);

                if (mSocket == null) {
                    mSocket = new DatagramSocket(BCAST_PORT);
                    mSocket.setReuseAddress(true);
                    mSocket.setBroadcast(true);
                }           

            } catch (IOException e) {
                Log.e(TAG, "Could not make socket", e);
            }
        }

解决方案

You need to set SO_REUSEADDR before binding. Don't specify port in the constructor - create unbound socket instead with DatagramSocket(null), then set options, then bind() explicitly.

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