之前一直会用sockets来实现emulator和PC进行通讯，卡了几天，最后请教其他人终于可以连接了。 错误原因是在IP和端口，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），端口用emulator的名称，5554或5556.java sever文件要另外建java工程运行，在android工程运行不了java（run application）
客户端代码：
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.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); //向服务器发送消息 PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true); out.println(message); //接收来自服务器的消息 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); //向服务器发送消息 PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true); out.println(message); //接收来自服务器的消息 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()); } } }); } } 服务器端代码：
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(); } }