Question

我有一个包含编辑文本的客户端类，输入的文本将通过LAN发送到特定主机，其IP定义为按下按钮。但它不起作用而且停止了。请帮我。我的客户端类是：

   public class MainActivity extends Activity {
 EditText et1;
  Button bt1;
   InetAddress IPAddress;
   DatagramPacket  dp;
   String message;
   int SERVERPORT = 11111;
      String SERVER_IP = "192.168.1.101";
   DatagramSocket clientSocket;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    et1=(EditText)findViewById(R.id.EditText01);
    bt1=(Button)findViewById(R.id.myButton);
    message=et1.getText().toString();
      try {


        clientSocket = new DatagramSocket();


    } catch (SocketException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }      
      try {


         IPAddress = InetAddress.getByName(SERVER_IP);


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


      byte[] sendData =  message.getBytes();

     dp = new DatagramPacket(sendData, sendData.length, IPAddress, SERVERPORT);


    bt1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub



              try {



                clientSocket.send(dp);



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


}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

       }

log cat is：

  08-27 07:04:52.967: D/gralloc_goldfish(531): Emulator without GPU emulation detected.
  08-27 07:05:03.018: D/AndroidRuntime(531): Shutting down VM
08-27 07:05:03.018: W/dalvikvm(531): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
   08-27 07:05:03.048: E/AndroidRuntime(531): FATAL EXCEPTION: main
  08-27 07:05:03.048: E/AndroidRuntime(531): android.os.NetworkOnMainThreadException
  08-27 07:05:03.048: E/AndroidRuntime(531):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1084)
     08-27 07:05:03.048: E/AndroidRuntime(531):     at libcore.io.BlockGuardOs.sendto(BlockGuardOs.java:163)
      08-27 07:05:03.048: E/AndroidRuntime(531):    at libcore.io.IoBridge.sendto(IoBridge.java:463)
 08-27 07:05:03.048: E/AndroidRuntime(531):     at java.net.PlainDatagramSocketImpl.send(PlainDatagramSocketImpl.java:182)
   08-27 07:05:03.048: E/AndroidRuntime(531):   at java.net.DatagramSocket.send(DatagramSocket.java:287)
  08-27 07:05:03.048: E/AndroidRuntime(531):    at com.example.alastclient.MainActivity$1.onClick(MainActivity.java:73)
  08-27 07:05:03.048: E/AndroidRuntime(531):    at android.view.View.performClick(View.java:3480)
   08-27 07:05:03.048: E/AndroidRuntime(531):   at android.view.View$PerformClick.run(View.java:13983)
  08-27 07:05:03.048: E/AndroidRuntime(531):    at android.os.Handler.handleCallback(Handler.java:605)
     08-27 07:05:03.048: E/AndroidRuntime(531):     at android.os.Handler.dispatchMessage(Handler.java:92)
    08-27 07:05:03.048: E/AndroidRuntime(531):  at android.os.Looper.loop(Looper.java:137)
  08-27 07:05:03.048: E/AndroidRuntime(531):    at android.app.ActivityThread.main(ActivityThread.java:4340)
 08-27 07:05:03.048: E/AndroidRuntime(531):     at java.lang.reflect.Method.invokeNative(Native Method)
  08-27 07:05:03.048: E/AndroidRuntime(531):    at java.lang.reflect.Method.invoke(Method.java:511)
  08-27 07:05:03.048: E/AndroidRuntime(531):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
   08-27 07:05:03.048: E/AndroidRuntime(531):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-27 07:05:03.048: E/AndroidRuntime(531):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

您的客户端应该包含用于在网络上发送数据包的新线程，在现有类中，您使用主线程以通过网络发送udp数据包，我认为这是不可行的，您必须创建一个按下按钮时的新线程，请参阅runnable和thread的android文档。

局域网中android上的UDP客户端

1 个答案: