服務器沒有收到來自客戶端的消息（安卓）

Question

我試圖我的客戶端（兩個客戶端&服務器）在整潔的代碼，一切工作正常。然後我寫了它在Eclipse SDK和我試圖在模擬器中運行它，服務器未收到消息了...

客戶端：

package com.aaa.udep; 

import com.aaa.udep.Client; 
import com.aaa.udep.R; 

import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 

public class MainActivity extends Activity { 
    Button button; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     button=(Button) findViewById(R.id.button1); 
     button.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       Thread thread=new Thread (new Client()); 
       thread.start(); 
      } 
     }); 


    } 

    @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; 
    } 

} 

package com.aaa.udep; 

import java.io.IOException; 
import java.net.DatagramPacket; 
import java.net.DatagramSocket; 
import java.net.InetAddress; 
import java.net.SocketTimeoutException; 
import java.net.UnknownHostException; 

import android.util.Log; 

public class Client implements Runnable { 

Client() 
{ 
    run(); 
} 
    @Override 

    public void run() { 
     // TODO Auto-generated method stub 



      try { 
       Log.i("MyApp", "starting"); 
       String messageStr = "Hello Android dolwno rabotatj, nado testirovatj na teelefone!"; 
       String serverHostname = new String ("127.0.0.1"); 
       DatagramSocket clientSocket = new DatagramSocket(); 
       InetAddress IPAddress = InetAddress.getByName(serverHostname); 
       Log.i("MyApp", "Atempting to connect"); 

       byte[] sendData = new byte[1024]; 
       byte[] receiveData = new byte[1024];   
      sendData = messageStr.getBytes(); 

      Log.d ("MyAPp","Sending data to server"); 
       DatagramPacket sendPacket = 
       new DatagramPacket(sendData, sendData.length, IPAddress, 9879); 

       clientSocket.send(sendPacket); 
       Log.d ("MyAPp","Sent"); 

       DatagramPacket receivePacket = 
       new DatagramPacket(receiveData, receiveData.length); 

       Log.d ("MyApp","Waiting for return packet"); 
       clientSocket.setSoTimeout(10000); 

       try { 
        clientSocket.receive(receivePacket); 
        String modifiedSentence = 
         new String(receivePacket.getData()); 

        InetAddress returnIPAddress = receivePacket.getAddress(); 

        int port = receivePacket.getPort(); 
        Log.d ("From server at get reply: ", serverHostname); 
        Log.d("Message: ", modifiedSentence); 

        } 
       catch (SocketTimeoutException ste) 
        { 

      ste.printStackTrace(); 
      Log.e("Timeout Occurred: Packet assumed lost", ste+""); 
       } 

       clientSocket.close(); 
      } 
      catch (UnknownHostException ex) { 
      ex.printStackTrace(); 
      Log.e("UnknownHostException", ex+""); 
      } 
      catch (IOException ex) { 
      ex.printStackTrace(); 
      Log.e("IO Expeption", ex+""); 

      } 
     } 
    } 
manifest: 
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> 
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /> 
    <uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
    <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" /> 

日誌：

03-28 00:53:37.159: I/MyApp(337): starting 
03-28 00:53:37.159: I/MyApp(337): Atempting to connect 
03-28 00:53:37.220: D/MyAPp(337): Sending data to server 
03-28 00:53:37.220: D/MyAPp(337): Sent 
03-28 00:53:37.220: D/MyApp(337): Waiting for return packet 
03-28 00:53:47.254: W/System.err(337): java.net.SocketTimeoutException: Connection timed out 
03-28 00:53:47.860: W/System.err(337): at org.apache.harmony.luni.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:263) 
03-28 00:53:47.860: W/System.err(337): at java.net.DatagramSocket.receive(DatagramSocket.java:414) 
03-28 00:53:47.870: W/System.err(337): at com.aaa.udep.Client.run(Client.java:51) 
03-28 00:53:47.870: W/System.err(337): at java.lang.Thread.run(Thread.java:1096) 
03-28 00:53:47.870: E/Timeout Occurred: Packet assumed lost(337): java.net.SocketTimeoutException: Connection timed out 

Answer 1

的Android模擬器不會與您的PC共享相同的IP地址，這意味着您不能使用環回IP 127.0.0.1並希望它連接到您的PC。 Android仿真器實例在具有自己的防火牆和子網的虛擬LAN上運行，並且可以通過該子網上的IP與PC進行通信。

至極是：10.0.2.2

更多關於模擬器網絡訪問this page。

希望幫助