我以前一直使用sockets实现emulator和PC进行通讯，卡了几天，最后请教其它人最终能够连接了。  错误原因是在IP和port，IP要用本机IP（在CMD输入ipconfig。注意：每次开机本机IP都不同，ADSL是动态IP），port用emulator的名称，5554或5556.java sever文件要另外建javaproject执行。在androidproject执行不了java（run application） 

client代码： 

Java代码  

package com.yarin.android.Examples_08_04;   

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.InetAddress;

import java.net.Socket;   

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;   

public class Activity01 extends Activity

{

    private final String        DEBUG_TAG   = "Activity01";   

    private TextView    mTextView=null;

    private EditText    mEditText=null;

    private Button      mButton=null;   

    @Override

    public void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);   

        mButton = (Button)findViewById(R.id.Button01);

        mTextView=(TextView)findViewById(R.id.TextView01);

        mEditText=(EditText)findViewById(R.id.EditText01);   

        //登陆

        mButton.setOnClickListener(new OnClickListener()

        {

            public void onClick(View v)

            {

                Socket socket = null;

                String message = mEditText.getText().toString() + "\r\n";

                try

                {

                    //创建Socket

                    socket = new Socket("116.29.27.138",5554); //查看本机IP,每次开机都不同

                    //socket=new Socket("192.168.1.110",50000);

                    //向server发送消息

                    PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);

                    out.println(message);    

                    //接收来自server的消息

                    BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

                    String msg = br.readLine();    

                    if ( msg != null )

                    {

                        mTextView.setText(msg);

                    }

                    else

                    {

                        mTextView.setText("数据错误!");

                    }

                    //关闭流

                    out.close();

                    br.close();

                    //关闭Socket

                    socket.close();

                }

                catch (Exception e)

                {

                    // TODO: handle exception

                    Log.e(DEBUG_TAG, e.toString());

                }

            }

        });

    }

}  

package com.yarin.android.Examples_08_04; 

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.InetAddress;

import java.net.Socket; 

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView; 

public class Activity01 extends Activity

{

private final String DEBUG_TAG = "Activity01"; 

private TextView mTextView=null;

private EditText mEditText=null;

private Button mButton=null; 

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main); 

mButton = (Button)findViewById(R.id.Button01);

mTextView=(TextView)findViewById(R.id.TextView01);

mEditText=(EditText)findViewById(R.id.EditText01); 

//登陆

mButton.setOnClickListener(new OnClickListener()

{

public void onClick(View v)

{

Socket socket = null;

String message = mEditText.getText().toString() + "\r\n";

try

{

//创建Socket

socket = new Socket("116.29.27.138",5554); //查看本机IP,每次开机都不同

//socket=new Socket("192.168.1.110",50000);

//向server发送消息

PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);

out.println(message); 

//接收来自server的消息

BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

String msg = br.readLine(); 

if ( msg != null )

{

mTextView.setText(msg);

}

else

{

mTextView.setText("数据错误!");

}

//关闭流

out.close();

br.close();

//关闭Socket

socket.close();

}

catch (Exception e)

{

// TODO: handle exception

Log.e(DEBUG_TAG, e.toString());

}

}

});

}

}

server端代码： 

Java代码  

package com.yarin.android.Examples_08_04;   

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;   

public class Server implements Runnable

{

    public void run()

    {

        try

        {

            //创建ServerSocket

            ServerSocket serverSocket = new ServerSocket(5554);

            while (true)

            {

                //接受客户端请求

                Socket client = serverSocket.accept();

                System.out.println("accept");

                try

                {

                    //接收客户端消息

                    BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));

                    String str = in.readLine();

                    System.out.println("read:" + str);

                    //向服务器发送消息

                    PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(client.getOutputStream())),true);

                    out.println("server message");

                    //关闭流

                    out.close();

                    in.close();

                }

                catch (Exception e)

                {

                    System.out.println(e.getMessage());

                    e.printStackTrace();

                }

                finally

                {

                    //关闭

                    client.close();

                    System.out.println("close");

                }

            }

        }

        catch (Exception e)

        {

            System.out.println(e.getMessage());

        }

    }

    //main函数。开启服务器

    public static void main(String a[])

    {

        Thread desktopServerThread = new Thread(new Server());

        desktopServerThread.start();

    }

}  

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