1：socket通訊首先要定義好服務端的ip地址和埠號；

(1)：首先看服務端的程式碼：

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() {
		@Override
		public void handleMessage(android.os.Message msg) {
			if (msg.what==0x11) {
				Bundle bundle = msg.getData();
				mTextView.append("client"+bundle.getString("msg")+"\n");
			}
		};
	};

	@Override
	protected 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 = "通訊成功";
				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 block
					e1.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)：因為是手機做服務端，所以在開始操作的時候客戶端是不知道ip和埠號的，但在服務端執行後就可以看到（親：你可以自己測試）

2：客戶端的程式碼

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() {
		@Override
		public void handleMessage(Message msg) {
			if (msg.what == 0x11) {
				Bundle bundle = msg.getData();
				txt1.append("server:" + bundle.getString("msg") + "\n");
			}
		}

	};

	@Override
	protected 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("建立連線").start();
		send.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				geted1 = ed1.getText().toString();
				txt1.append("client:" + geted1 + "\n");
				// 啟動執行緒 向伺服器傳送和接收資訊
				new MyThread(geted1).start();
			}
		});

	}

	class MyThread extends Thread {

		public String txt1;

		public MyThread(String str) {
			txt1 = str;
		}

		@Override
		public void run() {
			// 定義訊息
			Message msg = new Message();
			msg.what = 0x11;
			Bundle bundle = new Bundle();
			bundle.clear();
			try {
				// 連線伺服器 並設定連線超時為5秒
				socket = new Socket();
				socket.connect(new InetSocketAddress("172.20.226.11", 30000), 1000);
				// 獲取輸入輸出流
				OutputStream ou = socket.getOutputStream();
				BufferedReader bff = new BufferedReader(new InputStreamReader(socket.getInputStream()));
				// 讀取發來伺服器資訊
				String line = null;
				buffer = "";
				while ((line = bff.readLine()) != null) {
					buffer = line + buffer;
				}

				// 向伺服器傳送資訊
				ou.write(txt1.getBytes("gbk"));
				ou.flush();
				bundle.putString("msg", buffer.toString());
				msg.setData(bundle);
				// 傳送訊息 修改UI執行緒中的元件
				myHandler.sendMessage(msg);
				// 關閉各種輸入輸出流
				bff.close();
				ou.close();
				socket.close();
			} catch (SocketTimeoutException aa) {
				// 連線超時 在UI介面顯示訊息
				bundle.putString("msg", "伺服器連線失敗！請檢查網路是否開啟");
				msg.setData(bundle);
				// 傳送訊息 修改UI執行緒中的元件
				myHandler.sendMessage(msg);
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

}
 

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

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