如何获得在Android中使用UDP数据？ [英] How to receive data using UDP in Android?

问题描述

我用下面的code，从一个特定的端口接收数据。它不工作的机器人。但是，将数据发送到特定的端口工作正常。

 公共类UDPDemo延伸活动{
  私人TextView的电视;

  @覆盖
  公共无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.main）;
    电视=（TextView中）findViewById（R.id.recv_message）;
    尝试 {
      DatagramSocket的ClientSocket的=新的DatagramSocket（9876）;
      byte []的receivedata =新的字节[1024];
      而（真）
      {
        DatagramPacket类recv_packet =新的DatagramPacket（receivedata，receivedata.length）;
        Log.d（UDP，S：接收...）;
        clientsocket.receive（recv_packet）;
        字符串rec_str =新的String（recv_packet.getData（））;
        tv.setText（rec_str）;
        Log.d（接收字符串，rec_str）;
        InetAddress类ip地址= recv_packet.getAddress（）;
        INT端口= recv_packet.getPort（）;
        Log.d（IPAddress表示，ipaddress.toString（））;
        Log.d（端口，Integer.toString（端口））;
      }
    }赶上（例外五）{
      Log.e（UDP，S：错误，E）;
    }
  }
}
 

解决方案

如果您使用的是仿真器，你可能需要设置的重定向，记得模拟器是一个虚拟的路由器后面。

在换句话说，输入这些命令;

 远程登录本地主机5554
REDIR添加UDP：9876：9876
 

，然后重试。

I use the following code to receive the data from a particular port. It's not working in Android. But sending data to particular port is working fine.

public class UDPDemo extends Activity {
  private TextView tv;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    tv = (TextView)findViewById(R.id.recv_message);
    try {
      DatagramSocket clientsocket=new DatagramSocket(9876);
      byte[] receivedata = new byte[1024];
      while(true)
      {
        DatagramPacket recv_packet = new DatagramPacket(receivedata, receivedata.length);
        Log.d("UDP", "S: Receiving...");
        clientsocket.receive(recv_packet);
        String rec_str = new String(recv_packet.getData());
        tv.setText(rec_str);
        Log.d(" Received String ",rec_str);
        InetAddress ipaddress = recv_packet.getAddress();
        int port = recv_packet.getPort();
        Log.d("IPAddress : ",ipaddress.toString());
        Log.d(" Port : ",Integer.toString(port));
      }
    } catch (Exception e) {
      Log.e("UDP", "S: Error", e);
    }
  }
}

解决方案

If you are using the emulator you may need setup redirects, remember the emulator is behind a virtual router.

In other words, type these commands in;

telnet localhost 5554
redir add udp:9876:9876

and try again.

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