UDP-Connections within the emul_vusb模拟器-优快云博客

本文介绍了一个简单的UDP连接示例，演示了如何在两个设备之间发送和接收数据。客户端发送一条消息到指定的服务器地址和端口，服务器接收到消息并打印出来。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Hello Guys,

TCP seems to be a kind of problem !

For now I succeeded, to send data between two UDP-Connections within the emulator. The Log:

Java:

D/UDP(1515): S: Connecting... 
D/UDP(1515): S: Receiving... 
D/UDP(1515): C: Connecting... 
D/UDP(1515): C: Sending: 'Hello from Client' 
D/UDP(1515): S: Received: 'Hello from Client' 
D/UDP(1515): S: Done. 
D/UDP(1515): C: Sent. 
D/UDP(1515): C: Done.

I'll have a look for some working TCP-Stuff Exclamation

The code below will be put into an tutorial right now.

Java:

public class UDPConnection extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle icicle) { 
        super.onCreate(icicle); 
        setContentView(R.layout.main); 
        
        Thread sThread = new Thread(new Server()); 
        Thread cThread = new Thread(new Client()); 
        
        sThread.start(); 
        try { 
               Thread.sleep(500); 
          } catch (InterruptedException e) { } 
        
          cThread.start(); 
    } 
}

Java:

public class Server implements Runnable{ 
     public static final String SERVERIP = "127.0.0.1"; 
     public static final int SERVERPORT = 4444; 
           
     @Override 
     public void run() { 
          try { 
               Log.d("UDP", "S: Connecting..."); 
               InetAddress serverAddr = InetAddress.getByName(SERVERIP); 
               DatagramSocket socket = new DatagramSocket(SERVERPORT,serverAddr); 
               byte[] buf = new byte[17]; 
               DatagramPacket packet = new DatagramPacket(buf, buf.length); 
               Log.d("UDP", "S: Receiving..."); 
               socket.receive(packet); 
               Log.d("UDP", "S: Received: '" + new String(packet.getData()) + "'"); 
               Log.d("UDP", "S: Done."); 
          } catch (Exception e) { 
               Log.e("UDP", "S: Error", e); 
          } 
     } 
}

Java:

public class Client implements Runnable { 
     @Override 
     public void run() { 
          try { 
               Log.d("UDP", "C: Connecting..."); 
               DatagramSocket socket = new DatagramSocket(); 
               byte[] buf = ("Hello from Client").getBytes(); 
               InetAddress serverAddr = InetAddress.getByName(Server.SERVERIP); 
               DatagramPacket packet = new DatagramPacket(buf, buf.length, serverAddr, Server.SERVERPORT); 
               Log.d("UDP", "C: Sending: '" + new String(buf) + "'"); 
               socket.send(packet); 
               Log.d("UDP", "C: Sent."); 
               Log.d("UDP", "C: Done."); 
          } catch (Exception e) { 
               Log.e("UDP", "C: Error", e); 
          } 
     } 
}