Question

我有一个用Thread扩展的线程类，我试图在其他类中创建该类的对象并从那里启动线程，当按下按钮时将创建线程但是app只运行正常曾经，我创建线程的主要类是：

broadcastobject=new broadcast(messages);
broadcastobject.start();

我的主题类是：

public class broadcast  extends Thread{

private DatagramSocket socket;
String str;
private static final int TIMEOUT_MS = 10;
WifiManager mWifi;
EditText et;
DatagramPacket packet;
Button bt;
private static final int SERVERPORT = 11111;
private static final String SERVER_IP = "192.168.1.255";


public  broadcast(String msg){
    str=msg;
}

@Override
    public void run() {


        try {
            socket = new DatagramSocket(SERVERPORT);

            socket.setBroadcast(true);
       //               socket.setSoTimeout(TIMEOUT_MS);
        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

            InetAddress serverAddr = null;
            try {


                serverAddr = InetAddress.getByName(SERVER_IP);


            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

         packet = new DatagramPacket(str.getBytes(), str.length(),serverAddr,SERVERPORT);

            try {

                    socket.send(packet);

                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
    } 

    }

我的日志猫是：

     09-02 15:46:47.603: W/System.err(1348): java.net.BindException: bind failed: EADDRINUSE (Address already in use)
     09-02 15:46:47.613: W/System.err(1348):    at libcore.io.IoBridge.bind(IoBridge.java:89)
   09-02 15:46:47.613: W/System.err(1348):  at java.net.PlainDatagramSocketImpl.bind(PlainDatagramSocketImpl.java:68)
  09-02 15:46:47.643: W/System.err(1348):   at java.net.DatagramSocket.createSocket(DatagramSocket.java:133)
  09-02 15:46:47.703: W/System.err(1348):   at java.net.DatagramSocket.<init>(DatagramSocket.java:78)
   09-02 15:46:47.703: W/System.err(1348):  at soft.b.peopleassist.broadcast.run(broadcast.java:65)
  09-02 15:46:47.703: W/System.err(1348): Caused by: libcore.io.ErrnoException: bind failed: EADDRINUSE (Address already in use)
  09-02 15:46:47.703: W/System.err(1348):   at libcore.io.Posix.bind(Native Method)
   09-02 15:46:47.772: W/System.err(1348):  at libcore.io.ForwardingOs.bind(ForwardingOs.java:39)
   09-02 15:46:47.772: W/System.err(1348):  at libcore.io.IoBridge.bind(IoBridge.java:87)
  09-02 15:46:47.772: W/System.err(1348):   ... 4 more
  09-02 15:46:47.793: W/dalvikvm(1348): threadid=11: thread exiting with uncaught exception (group=0x409961f8)
09-02 15:46:47.823: E/AndroidRuntime(1348): FATAL EXCEPTION: Thread-79
 09-02 15:46:47.823: E/AndroidRuntime(1348): java.lang.NullPointerException
 09-02 15:46:47.823: E/AndroidRuntime(1348):    at soft.b.peopleassist.broadcast.run(broadcast.java:90)
  09-02 15:47:21.832: I/Process(1348): Sending signal. PID: 1348 SIG: 9

Answer 1

您正在尝试在已使用的端口上绑定套接字。您需要在绑定新套接字之前关闭绑定套接字。

你的应用程序下的Linux系统可能需要一些时间才能注意到，绑定的套接字已经消失，如果你只是让你的应用程序崩溃或忘记在Socket.close()中拨打onDestroy()或在你的适当的任何地方情况下。

创建新线程时出现空指针异常

1 个答案: