1：socket通信首先要定义好服务端的ip地址和端口号；

(1)：首先看服务端的代码：

package com.example.androidsockettest;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.widget.TextView;public class MainActivity extends Activity {public static ServerSocket serverSocket = null;public static TextView mTextView, textView1;private String IP = "";String buffer = "";public static Handler mHandler = new Handler() {@Overridepublic void handleMessage(android.os.Message msg) {if (msg.what==0x11) {Bundle bundle = msg.getData();mTextView.append("client"+bundle.getString("msg")+"\n");}};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mTextView = (TextView) findViewById(R.id.textsss);textView1 = (TextView) findViewById(R.id.textView1);IP = getlocalip();textView1.setText("IP addresss:"+IP);new Thread() {public void run() {Bundle bundle = new Bundle();bundle.clear();OutputStream output;String str = "通信成功";try {serverSocket = new ServerSocket(30000);while (true) {Message msg = new Message();msg.what = 0x11;try {Socket socket = serverSocket.accept();output = socket.getOutputStream();output.write(str.getBytes("UTF-8"));output.flush();socket.shutdownOutput();//mHandler.sendEmptyMessage(0);BufferedReader bff = new BufferedReader(new InputStreamReader(socket.getInputStream()));String line = null;buffer = "";while ((line = bff.readLine())!=null) {buffer = line + buffer;}bundle.putString("msg", buffer.toString());msg.setData(bundle);mHandler.sendMessage(msg);bff.close();output.close();socket.close();} catch (IOException e) {e.printStackTrace();}}} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}};}.start();}private String getlocalip(){  WifiManager wifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);    WifiInfo wifiInfo = wifiManager.getConnectionInfo();    int ipAddress = wifiInfo.getIpAddress();   //  Log.d(Tag, "int ip "+ipAddress);  if(ipAddress==0)return null;  return ((ipAddress & 0xff)+"."+(ipAddress>>8 & 0xff)+"."  +(ipAddress>>16 & 0xff)+"."+(ipAddress>>24 & 0xff));  } }

(2)：因为是手机做服务端，所以在开始操作的时候客户端是不知道ip和端口号的，但在服务端运行后就可以看到（亲：你可以自己测试）

2：客户端的代码

package com.example.andoroidclient;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketTimeoutException;import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;public class MainActivity extends Activity {Socket socket = null;String buffer = "";TextView txt1;Button send;EditText ed1;String geted1;public Handler myHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {if (msg.what == 0x11) {Bundle bundle = msg.getData();txt1.append("server:" + bundle.getString("msg") + "\n");}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);txt1 = (TextView) findViewById(R.id.txt1);send = (Button) findViewById(R.id.send);ed1 = (EditText) findViewById(R.id.ed1);new MyThread("建立连接").start();send.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {geted1 = ed1.getText().toString();txt1.append("client:" + geted1 + "\n");// 启动线程 向服务器发送和接收信息new MyThread(geted1).start();}});}class MyThread extends Thread {public String txt1;public MyThread(String str) {txt1 = str;}@Overridepublic void run() {// 定义消息Message msg = new Message();msg.what = 0x11;Bundle bundle = new Bundle();bundle.clear();try {// 连接服务器 并设置连接超时为5秒socket = new Socket();socket.connect(new InetSocketAddress("172.20.226.11", 30000), 1000);// 获取输入输出流OutputStream ou = socket.getOutputStream();BufferedReader bff = new BufferedReader(new InputStreamReader(socket.getInputStream()));// 读取发来服务器信息String line = null;buffer = "";while ((line = bff.readLine()) != null) {buffer = line + buffer;}// 向服务器发送信息ou.write(txt1.getBytes("gbk"));ou.flush();bundle.putString("msg", buffer.toString());msg.setData(bundle);// 发送消息 修改UI线程中的组件myHandler.sendMessage(msg);// 关闭各种输入输出流bff.close();ou.close();socket.close();} catch (SocketTimeoutException aa) {// 连接超时 在UI界面显示消息bundle.putString("msg", "服务器连接失败！请检查网络是否打开");msg.setData(bundle);// 发送消息 修改UI线程中的组件myHandler.sendMessage(msg);} catch (IOException e) {e.printStackTrace();}}}}

3：最后别忘记加网络权限

  <uses-permission android:name="android.permission.INTERNET" />

附上源码：

项目源码