安卓 WIFI通信之聊天小程序

布满荆棘的人生 2022-05-14 15:23 320阅读 0赞

### **安卓  WIFI通信之聊天小程序** ###

一、简述

记--使用WIFI实现的一个简单一对一聊天小程序。一台设备开启WIFI热点，另外一台设备进行连接，然后互相收发信息。

例子打包:链接: https://pan.baidu.com/s/1uOGxQJPmfJhtM8S6soqkVQ 提取码: 5b56

二、效果

![20181030185843580.gif][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmZlaWJ1eWk_size_16_color_FFFFFF_t_70][]

三、工程结构

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmZlaWJ1eWk_size_16_color_FFFFFF_t_70 1][]

四、源文件

添加的权限 （改变网络状态权限，改变WIFI状态权限，获取网络状态权限，获取WIFI状态权限，网络权限）

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

MainActivity.java文件

package com.liang.wifi;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.net.ConnectivityManager;
 import android.net.DhcpInfo;
 import android.net.NetworkInfo;
 import android.net.NetworkInfo.DetailedState;
 import android.net.wifi.ScanResult;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.text.TextUtils;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.ScrollView;
 import android.widget.TextView;
 import android.widget.Toast;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.Serializable;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.List;
 
 
 public class MainActivity extends Activity implements View.OnClickListener {
 
 private Button btn_create_hostspot;//"创建WIFI热点"按钮
 private Button btn_close_hostspot;//"关闭热点"
 private Button btn_exit;//"退出"
 private Button btn_send;//"发送信息"
 private Button btn_search;//搜索附近热点信息
 private TextView tv_rmsg;//显示连接信息、接收的信息
 private TextView tv_state;//显示WIFI连接状态
 private EditText edt_smsg;//要发送的信息
 private ScrollView sv;//滚动视图，适配TextView内容，当内容过多，以滚动条形式显示
 
 private WifiManager wifiManager;//WIFI管理对象
 private WifiConfiguration config;//WIFI配置
 private int netID;//网络身份ID
 private boolean scan_WIFIHOT = false;//用来控制跳转到WIFI热点列表的
 
 private static final String WIFI_HOTSPOT_SSID = "TEST";//WIFI热点名称
 private static final String WIFI_PWD = "12345678";//热点密码
 private static final int PORT = 54321;//端口号
 
 public static final int WIFICIPHER_NOPASS = 1;//热点无密码
 public static final int WIFICIPHER_WEP = 2;//热点加密方式为 WEP
 public static final int WIFICIPHER_WPA = 3;//热点加密方式为 WPA
 
 public static final int DEVICE_CONNECTING = 4;//有设备正在连接热点
 public static final int DEVICE_CONNECTED = 5;//有设备连上热点
 public static final int SEND_MSG_SUCCSEE = 6;//发送消息成功
 public static final int SEND_MSG_ERROR = 7;//发送消息失败
 public static final int GET_MSG = 8;//获取新消息
 public static final int TOAST_MSG = 10;//弹出toast提示框
 public static final int REQUEST_CONNECT_DEVICE = 11;//用来表示请求连接设备
 
 private ConnectThread connectThread;//连接线程
 private ListenerThread listenerThread;//监听线程
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);//设置主页面
 initView();//初始化控件
 initBroadcastReceiver();//注册广播
 
 //获取WIFI管理助手对象
 wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
 
 //开启监听线程
 listenerThread = new ListenerThread(PORT, handler);
 listenerThread.start();
 }
 
 //初始化控件，并绑定列表选项的点击事件
 private void initView() 
 {
 	//获取控件句柄
 btn_create_hostspot = (Button) findViewById(R.id.btn_create_hostspot);
 btn_close_hostspot = (Button) findViewById(R.id.btn_close_hostspot);
 btn_exit = (Button) findViewById(R.id.btn_exit);
 btn_send = (Button) findViewById(R.id.btn_send);
 btn_search = (Button) findViewById(R.id.btn_search);
 tv_rmsg = (TextView) findViewById(R.id.tv_rmsg);
 tv_state = (TextView) findViewById(R.id.tv_state);
 edt_smsg = (EditText) findViewById(R.id.edt_smsg);
 sv = (ScrollView)findViewById(R.id.sv_list);
 
 //绑定点击事件
 btn_create_hostspot.setOnClickListener(this);
 btn_close_hostspot.setOnClickListener(this);
 btn_exit.setOnClickListener(this);
 btn_send.setOnClickListener(this);
 btn_search.setOnClickListener(this);
 
 } 
 
 //连接WIFI热点，根据WIFI热点的配置信息进行连接
 private void connect(WifiConfiguration config) 
 {
 	tv_state.append("连接中...");//显示当前连接状态
 netID = wifiManager.addNetwork(config);//根据热点配置添加网络，返回网络身份ID,如果是-1则添加失败
 wifiManager.enableNetwork(netID, true);//连接网络(连接成功会有相应的广播信息)
 
 }
 
 
 //自定义广播接收者
 private BroadcastReceiver receiver = new BroadcastReceiver()
 {
 @Override
 public void onReceive(Context context, Intent intent) {
 final String action = intent.getAction();//收到的广播动作
 
 //根据广播动作做出相应的响应
 if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) 
 {
 // wifi已成功扫描到可用wifi热点
 if(scan_WIFIHOT)//点击了"搜索"按钮才跳转到WIFI列表
 {
 	//获取扫描的结果（有可能含有SSID为空的数据，尚未处理）
 	ArrayList<ScanResult> scanResultList = (ArrayList<ScanResult>)wifiManager.getScanResults();
 	
 	Intent scanIntent = new Intent(MainActivity.this, WiFiListActivity.class); //跳转到WIFI列表界面
 	scanIntent.putParcelableArrayListExtra("SCANRESLIST", scanResultList);//将热点数据传递过去，显示到ListView
 	startActivityForResult(scanIntent, REQUEST_CONNECT_DEVICE); //设置返回宏定义
 scan_WIFIHOT = false;
 }
 } 
 else if (action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) 
 {//WIIF状态改变
 	//获取WIFI状态
 int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
 switch (wifiState) 
 {
 case WifiManager.WIFI_STATE_ENABLED:
 //获取到wifi开启的广播时，开始扫描
 wifiManager.startScan();
 break;
 case WifiManager.WIFI_STATE_DISABLED://wifi关闭发出的广播
 Toast.makeText(MainActivity.this, "WiFi已关闭", Toast.LENGTH_SHORT).show();
 break;
 }
 } 
 else if (action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) 
 {//网络状态改变
 	//获取网络信息
 NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
 if (info.getState().equals(NetworkInfo.State.DISCONNECTED)) 
 {
 	//断开连接
 	tv_state.setText("提示：连接已断开。");
 } 
 else if (info.getState().equals(NetworkInfo.State.CONNECTED)) 
 {
 	//已连接网络
 WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
 final WifiInfo wifiInfo = wifiManager.getConnectionInfo();
 tv_state.setText("已连接到热点:" + wifiInfo.getSSID()+"\n");
 String local_ip = intToIp(wifiInfo.getIpAddress());//自己的IP
 DhcpInfo ipinfo = wifiManager.getDhcpInfo();//获取WIFI热点的IP 
 	final String ip = intToIp(ipinfo.serverAddress);
 if (wifiInfo.getSSID().equals("\""+WIFI_HOTSPOT_SSID+"\"") ) 
 {
 	tv_state.append("热点ip:"+ip+"\n");
 	tv_state.append("本机ip:"+local_ip+"\n");
 	//开启连接线程
 	new Thread(){
 @Override
 public void run() {
 			 	 Socket socket;
 								try {
 									socket = new Socket(ip, PORT);//创建与热点通信的socket
 									connectThread = new ConnectThread(socket, handler);
 			 connectThread.start();
 								} catch (UnknownHostException e1) {
 									sendHandlerMsg("err1");
 									e1.printStackTrace();
 								} catch (IOException e1) {
 									e1.printStackTrace();
 									sendHandlerMsg("err2");
 								}
 						
 }
 	}.start();
 	
 }
 
 } 
 else 
 { 
 	//实时网络连接状态
 NetworkInfo.DetailedState state = info.getDetailedState();
 if (state == DetailedState.CONNECTING) {
 	tv_state.setText("连接中...");
 } else if (state == DetailedState.AUTHENTICATING) {
 	tv_state.setText("正在验证身份信息...");
 } else if (state == DetailedState.OBTAINING_IPADDR) {
 	tv_state.setText("正在获取IP地址...");
 } else if (state == DetailedState.FAILED) {
 	tv_state.setText("连接失败");
 }
 }
 
 }
 }
 };
 
 //int形式的ip转为字符串形式的ip
 private String intToIp(int i) 
 {
 return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "."
 + ((i >> 24) & 0xFF);
 }
 
 //初始化广播并注册
 private void initBroadcastReceiver() 
 {
 IntentFilter intentFilter = new IntentFilter();
 intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
 intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
 intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
 intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
 
 registerReceiver(receiver, intentFilter);//注册广播
 }
 
 //按钮的点击响应事件
 @Override
 public void onClick(View v) {
 switch (v.getId()) {
 case R.id.btn_create_hostspot:
 createWifiHotspot();//开启WIFI热点
 break;
 case R.id.btn_close_hostspot:
 closeWifiHotspot();//关闭WIFI热点
 break;
 case R.id.btn_send://发送信息
 if (connectThread != null) 
 {
 	if(!edt_smsg.getText().toString().equals(""))//消息不为空
 	{
 		connectThread.sendData( edt_smsg.getText().toString() );
 		edt_smsg.setText("");
 	}
 }
 else
 {
 Toast.makeText(this, "未连接设备", Toast.LENGTH_SHORT).show();
 }
 break;
 case R.id.btn_search://搜索周边热点信息
 	searchWiFiHot();
 break;
 case R.id.btn_exit://退出程序
 	showAlertDialog("退出应用", "您确认退出吗？", "取消" ,"确认", 0);
 	break;
 }
 }
 
 /**
 * 创建Wifi热点
 */
 private void createWifiHotspot() {
 if (wifiManager.isWifiEnabled()) {
 //如果wifi处于打开状态，则关闭wifi,
 wifiManager.setWifiEnabled(false);
 }
 //热点设置
 WifiConfiguration config = new WifiConfiguration();
 config.SSID = WIFI_HOTSPOT_SSID;//热点名称
 config.preSharedKey = WIFI_PWD;//热点密码
 config.hiddenSSID = false;//是否隐藏密码
 config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);//开放系统认证
 config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
 config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);//设置加密方式
 config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
 config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
 config.allowedPairwiseCiphers
 .set(WifiConfiguration.PairwiseCipher.CCMP);
 config.status = WifiConfiguration.Status.ENABLED;
 //通过反射调用设置热点
 try {
 Method method = wifiManager.getClass().getMethod(
 "setWifiApEnabled", WifiConfiguration.class, Boolean.TYPE);
 boolean enable = (Boolean) method.invoke(wifiManager, config, true);
 if (enable) {
 	//DhcpInfo info = wifiManager.getDhcpInfo();//热点本机IP
 	//String ip = intToIp(info.serverAddress);
 	tv_state.setText("热点已开启 热点名称:" + WIFI_HOTSPOT_SSID +" 密码:"+WIFI_PWD+"\n");
 } else {
 	tv_state.setText("创建热点失败");
 }
 } catch (Exception e) {
 e.printStackTrace();
 tv_state.setText("创建热点失败");
 }
 }
 
 /**
 * 关闭WiFi热点 (利用反射访问隐藏的热点设置函数)
 */
 private void closeWifiHotspot() {
 try {
 Method method = wifiManager.getClass().getMethod("getWifiApConfiguration");
 method.setAccessible(true);
 WifiConfiguration config = (WifiConfiguration) method.invoke(wifiManager);
 Method method2 = wifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
 method2.invoke(wifiManager, config, false);
 } catch (NoSuchMethodException e) {
 e.printStackTrace();
 } catch (IllegalArgumentException e) {
 e.printStackTrace();
 } catch (IllegalAccessException e) {
 e.printStackTrace();
 } catch (InvocationTargetException e) {
 e.printStackTrace();
 }
 tv_state.setText("热点已关闭");
 }
 
 
 /**
 * 搜索wifi热点
 */
 private void searchWiFiHot() 
 {
 if (!wifiManager.isWifiEnabled()) //如果还没有开启WIFI则开启
 {
 //开启wifi
 wifiManager.setWifiEnabled(true);
 }
 wifiManager.startScan();//扫描周边热点信息
 Toast.makeText(this, "正在扫描周边热点。。。请稍后！", Toast.LENGTH_SHORT).show();
 scan_WIFIHOT = true;//可以跳转到WIFI热点列表
 }
 
 /* 
 * 接收活动结果，响应startActivityForResult()
 */
 public void onActivityResult(int requestCode, int resultCode, Intent data) {
 	
 	switch(requestCode)
 	{
 	case REQUEST_CONNECT_DEVICE://从热点列表界面返回
 		if (resultCode == RESULT_OK)//选择一个设备
 		{
 			//获取返回的数据(所选择的热点信息)
 			final String ssid = data.getStringExtra("SSID");
 			wifiManager.disconnect();//断开之前的连接
 String capabilities = data.getStringExtra("CAPABILITIES");
 //判断WIFI热点加密类型
 int type = MainActivity.WIFICIPHER_WPA;
 if (!TextUtils.isEmpty(capabilities)) {
 if (capabilities.contains("WPA") || capabilities.contains("wpa")) {
 type = MainActivity.WIFICIPHER_WPA;
 } else if (capabilities.contains("WEP") || capabilities.contains("wep")) {
 type = MainActivity.WIFICIPHER_WEP;
 } else {
 type = MainActivity.WIFICIPHER_NOPASS;
 }
 }
 //根据热点的SSID判断之前是否连接过
 config = isExsits(ssid);
 if (config == null) //没有连接过
 {
 if (type != WIFICIPHER_NOPASS)//需要密码
 {
 	//弹出密码输入框
 final EditText editText = new EditText(MainActivity.this);
 final int finalType = type;
 new AlertDialog.Builder(MainActivity.this).setTitle("请输入Wifi密码").setIcon(
 android.R.drawable.ic_dialog_info).setView(
 editText).setPositiveButton("确定", new DialogInterface.OnClickListener() {
 @Override
 public void onClick(DialogInterface dialog, int which)
 {
 config = createWifiInfo(ssid, editText.getText().toString(), finalType);
 connect(config);
 }
 })
 .setNegativeButton("取消", null).show();
 return;
 } 
 else//热点是开放的(不需要密码)
 {
 config = createWifiInfo(ssid, "", type);
 connect(config);
 }
 } 
 else 
 {
 	//之前连接过则直接进行连接
 connect(config);
 }
 } 
 		break;
 	default:break;
 	}
 }
 
 //退出程序时释放资源
 @Override
 protected void onDestroy() {
 super.onDestroy();
 unregisterReceiver(receiver);//注销广播注册
 //关闭线程、释放socket资源等等
 }
 
 //Handler操作 (收到Hansler信号做出反应，通常用来处理子线程的请求)
 @SuppressLint("HandlerLeak") //jdk版本问题
 private Handler handler = new Handler() {
 @Override
 public void handleMessage(Message msg) 
 {
 switch (msg.what) {
 case DEVICE_CONNECTING://进行连接(本机开热点，连接其他手机)
 	//有客户端连接
 	tv_state.append( "【IP:"+(String)msg.obj +"】");
 	connectThread = new ConnectThread(listenerThread.getSocket(),handler);
 connectThread.start();
 break;
 case DEVICE_CONNECTED://有设备连接成功
 	tv_rmsg.append("***设备连接成功***\n");
 	sv.scrollTo(0,tv_rmsg.getMeasuredHeight()); //适配内容
 	 		break;
 case SEND_MSG_SUCCSEE://成功发送消息
 	tv_rmsg.append("(我)" + msg.getData().getString("MSG")+"\n");
 	sv.scrollTo(0,tv_rmsg.getMeasuredHeight()); //适配内容
 	 		break;
 case SEND_MSG_ERROR://发送消息失败
 	tv_rmsg.append("发送失败:" + msg.getData().getString("MSG")+"\n");
 	sv.scrollTo(0,tv_rmsg.getMeasuredHeight()); //适配内容
 	 		break;
 case GET_MSG://收到消息
 	tv_rmsg.append(msg.getData().getString("MSG")+"\n");
 	sv.scrollTo(0,tv_rmsg.getMeasuredHeight()); //适配内容
 	 		break;
 case TOAST_MSG:
 	Toast.makeText(MainActivity.this, (String)msg.obj, Toast.LENGTH_SHORT).show();
 	break;
 }
 }
 };
 
 //发送Handler消息，弹出Toast信息
 public void sendHandlerMsg(String msg)
 {
 	 Message message = Message.obtain();
 message.what = MainActivity.TOAST_MSG;
 message.obj = msg;
 handler.sendMessage(message);
 }
 
 /**
 * 判断当前wifi是否有保存
 * @param SSID 热点信息
 * @return
 */
 public WifiConfiguration isExsits(String SSID) {
 List<WifiConfiguration> existingConfigs = wifiManager.getConfiguredNetworks();
 for (WifiConfiguration existingConfig : existingConfigs) {
 if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
 return existingConfig;
 }
 }
 return null;
 }
 
 //创建WIFI配置信息
 public WifiConfiguration createWifiInfo(String SSID, String password, int type) {
 WifiConfiguration config = new WifiConfiguration();
 config.allowedAuthAlgorithms.clear();
 config.allowedGroupCiphers.clear();
 config.allowedKeyManagement.clear();
 config.allowedPairwiseCiphers.clear();
 config.allowedProtocols.clear();
 config.SSID = "\"" + SSID + "\"";
 if (type == WIFICIPHER_NOPASS) {
 config.wepKeys[0] = "\"" + "\"";
 config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
 config.wepTxKeyIndex = 0;
 } else if (type == WIFICIPHER_WEP) {
 config.preSharedKey = "\"" + password + "\"";
 config.hiddenSSID = false;
 config.allowedAuthAlgorithms
 .set(WifiConfiguration.AuthAlgorithm.SHARED);
 config.allowedGroupCiphers
 .set(WifiConfiguration.GroupCipher.CCMP);
 config.allowedGroupCiphers
 .set(WifiConfiguration.GroupCipher.TKIP);
 config.allowedGroupCiphers
 .set(WifiConfiguration.GroupCipher.WEP40);
 config.allowedGroupCiphers
 .set(WifiConfiguration.GroupCipher.WEP104);
 config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
 config.wepTxKeyIndex = 0;
 } else if (type == WIFICIPHER_WPA) {
 config.preSharedKey = "\"" + password + "\"";
 config.hiddenSSID = false;
 config.allowedAuthAlgorithms
 .set(WifiConfiguration.AuthAlgorithm.OPEN);
 config.allowedGroupCiphers
 .set(WifiConfiguration.GroupCipher.TKIP);
 config.allowedKeyManagement
 .set(WifiConfiguration.KeyMgmt.WPA_PSK);
 config.allowedPairwiseCiphers
 .set(WifiConfiguration.PairwiseCipher.TKIP);
 // config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
 config.allowedGroupCiphers
 .set(WifiConfiguration.GroupCipher.CCMP);
 config.allowedPairwiseCiphers
 .set(WifiConfiguration.PairwiseCipher.CCMP);
 config.status = WifiConfiguration.Status.ENABLED;
 } else {
 return null;
 }
 return config;
 }
 
 //弹出确认对话框
 private void showAlertDialog(String title, String content, String negative, String positive, final int action)
 {
 	//创建一个对话框
 	AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
 	dialog.setTitle(title); //对话框标题
 	dialog.setMessage(content);//设置对话框内容提示
 		if(!negative.isEmpty() && negative != "" )//按需要是否添加“取消”按钮
 		{
 			//添加"取消按钮"，并且单击时响应
 			dialog.setNegativeButton(negative,new DialogInterface.OnClickListener() { 
 	 @Override 
 	 public void onClick(DialogInterface dialog, int which) 
 	 {}
 			});
 		}
 		
 		//添加一个确定按钮，并且单击时响应
 		dialog.setPositiveButton(positive, new DialogInterface.OnClickListener() { 
 @Override 
 public void onClick(DialogInterface dialog, int which) 
 { 
 	switch(action)
 	{
 	case 0://退出应用操作
 		finish();//关闭本页面
 		break;
 	case 1://"确认" 
 		break;
 	default:
 		break;
 	}
 } 
 
 }); 
 		dialog.show();
 }
 
 /**
 * 监听线程 (等待其它设备来连接)
 */
 public class ListenerThread extends Thread
 {
 
 private ServerSocket serverSocket = null;//用来监听本机的某个端口，等待其他设备的连接
 private Handler handler;//用来将数据、信息通知主线程
 private Socket socket;//通信socket
 private boolean thread_run;//用来控监听线程的结束(不能立即结束，因为accpept阻塞等待)
 
 public ListenerThread(int port, Handler handler)
 {
 //setName("ListenerThread");//设置线程的名称
 thread_run = true;
 this.handler = handler;
 try {
 serverSocket = new ServerSocket(port);//监听本机的port端口
 } catch (IOException e) {}
 }
 
 
 @Override
 public void run() {
 while (thread_run)
 {
 try {
 	//阻塞，等待设备连接
 socket = serverSocket.accept();
 
 sendHandlerMsg("发现设备");
 
 //有设备连接，使用Handler通知主线程
 Message message = Message.obtain();//获取消息对象
 message.what = MainActivity.DEVICE_CONNECTING;//消息类型
 message.obj = socket.getLocalAddress().getHostAddress();//自己的IP
 handler.sendMessage(message);//发送消息
 
 //发送一个“你好”信息给连接的设备
 //outputStream = socket.getOutputStream();
 //outputStream.write("你好！\n".getBytes());
 
 
 } catch (IOException e) {}
 }
 }
 
 //退出线程
 public void close()
 {
 	thread_run = false;
 	try {
 				serverSocket.close();
 			} catch (IOException e) {}
 }
 
 //获取通信socket(主线程可以通过此方法获取通信的socket)
 public Socket getSocket() 
 {
 return socket;
 }
 }
 
 
 /**
 * 连接线程 (用来通信的线程)
 */
 public class ConnectThread extends Thread{
 
 private final Socket socket;//通信socket
 private Handler handler;//用来更新UI等(发送信息给主线程)
 private InputStream inputStream;//数据输入流
 private OutputStream outputStream;//数据输出流
 
 public ConnectThread(Socket socket, Handler handler)
 {
 //setName("ConnectThread");//设置线程的名称
 this.socket = socket;//初始化通信socket
 this.handler = handler;//初始化handler
 }
 
 //线程运行所执行的函数
 @Override
 public void run() 
 {
 if(socket==null){
 return;
 }
 //发送不带数据的handler信号
 handler.sendEmptyMessage(MainActivity.DEVICE_CONNECTED);//发送已连接 信号
 try 
 {
 //获取数据流
 inputStream = socket.getInputStream();//用来接收消息
 outputStream = socket.getOutputStream();//用来发送消息
 
 byte[] buffer = new byte[1024];
 int lens = 0;
 while (true)
 {
 //读取数据
 	lens = inputStream.read(buffer);
 if (lens > 0) 
 {
 final byte[] data = new byte[lens];
 System.arraycopy(buffer, 0, data, 0, lens);
 
 //将信息显示到UI
 Message message = Message.obtain();
 message.what = MainActivity.GET_MSG;
 Bundle bundle = new Bundle();
 bundle.putString("MSG",new String(data));
 message.setData(bundle);
 handler.sendMessage(message);
 
 
 }
 }
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 
 /**
 * 发送数据
 */
 public void sendData(String msg)
 {
 	//将消息添加上发送者IP
 	msg = socket.getLocalAddress().getHostAddress() + ":" + msg;
 	
 	if(outputStream!=null)
 {
 		try {
 	//发送信息
 outputStream.write(msg.getBytes());
 //提示发送信息成功
 Message message = Message.obtain();
 message.what = MainActivity.SEND_MSG_SUCCSEE;
 Bundle bundle = new Bundle();
 bundle.putString("MSG",new String(msg));
 message.setData(bundle);
 handler.sendMessage(message);
 } catch (IOException e) {}
 }
 }
 }
 
 
 }

WiFiListActivity.java文件

package com.liang.wifi;
 
 import java.io.Serializable;
 import java.util.List;
 
 import android.net.wifi.ScanResult;
 import android.os.Bundle;
 import android.view.View;
 import android.view.Window;
 import android.view.View.OnClickListener;
 import android.widget.AdapterView;
 import android.widget.Button;
 import android.widget.ListView;
 import android.widget.Toast;
 import android.app.Activity;
 import android.content.Intent;
 
 public class WiFiListActivity extends Activity {
 
 	private ListView listView;//用来显示搜索到的WIFI热点
 	private WifiListAdapter wifiListAdapter;//WIFI列表适配器
 
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		
 		try
 		{
 			// 创建并显示窗口
 	 requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); //设置窗口显示模式为窗口方式,有个滚动圈
 	 //设置窗口标题
 	 setTitle("WiFi热点列表");
 	 //设置界面
 			setContentView(R.layout.activity_wifi_list);
 			//获取listView控件句柄
 			listView = (ListView) findViewById(R.id.listView);
 	 
 			//设置ListView适配器
 	 wifiListAdapter = new WifiListAdapter(this, R.layout.wifi_list_item);
 	 listView.setAdapter(wifiListAdapter);
 	 
 	 //获取从MainActivity传递过来的周边热点数据集合
 	 List<ScanResult> scanResultList = getIntent().getParcelableArrayListExtra("SCANRESLIST");
 	 
 	 wifiListAdapter.clear();//清空原来的数据
 	 wifiListAdapter.addAll(scanResultList);//填充数据
 	 
 	 //绑定列表数据项的点击响应事件
 	 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 	 @Override
 	 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 	 	//拿到选中的热点信息
 	 	ScanResult scanResult = wifiListAdapter.getItem(position);
 	 	
 	 	// 设置返回数据 (返回选中的热点信息)
 	 Intent intent = new Intent();
 	 intent.putExtra("SSID", scanResult.SSID);
 	 intent.putExtra("CAPABILITIES", scanResult.capabilities);
 	 // 设置返回值并结束程序
 	 setResult(Activity.RESULT_OK, intent);
 	 finish();//关闭本页面
 	 }
 	 });
 	 
 	 //“取消”按键响应
 	 Button btn_cancel = (Button) findViewById(R.id.btn_cancel);
 	 btn_cancel.setOnClickListener(new OnClickListener() {
 	 public void onClick(View v) {
 	 	finish();//关闭本页面
 	 }
 	 });
 		}
 		catch(Exception e){}
 
 	}
 }

WifiListAdapter.java文件

package com.liang.wifi;
 
 import android.content.Context;
 import android.net.wifi.ScanResult;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
 import android.widget.TextView;
 
 //WiFi列表适配器类 用来填充ListView
 public class WifiListAdapter extends ArrayAdapter<ScanResult> {
 
 private final LayoutInflater mInflater;//xml布局加载器
 private int mResource;//xml布局ID号
 
 public WifiListAdapter(Context context, int resource) {
 super(context, resource);
 mInflater = LayoutInflater.from(context);
 mResource = resource;
 }
 
 //填充ListView的数据项
 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
 
 if (convertView == null) {
 convertView = mInflater.inflate(mResource, parent, false);
 }
 
 //列表中的一个数据项(有两个TextView用来显示WIFI热点名称和信号的强弱)
 TextView name = (TextView) convertView.findViewById(R.id.wifi_name);
 TextView signl = (TextView) convertView.findViewById(R.id.wifi_signal);
 
 //拿到所点击的热点的相关信息
 ScanResult scanResult = getItem(position);
 
 //显示热点的名称
 name.setText(scanResult.SSID);
 
 //显示热点信号的强弱
 int level = scanResult.level;
 if (level <= 0 && level >= -50) {
 signl.setText("信号很好");
 } else if (level < -50 && level >= -70) {
 signl.setText("信号较好");
 } else if (level < -70 && level >= -80) {
 signl.setText("信号一般");
 } else if (level < -80 && level >= -100) {
 signl.setText("信号较差");
 } else {
 signl.setText("信号很差");
 }
 
 return convertView;
 }
 
 }

布局文件

activity\_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 
 <TextView
 android:id="@+id/tv_state"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_weight="0.04"
 android:text="未连接设备" />
 
 <ScrollView
 android:id="@+id/sv_list"
 android:layout_width="fill_parent"
 android:layout_height="0dp"
 android:layout_weight="0.36"
 android:scrollbars="vertical" >
 
 <TextView
 android:id="@+id/tv_rmsg"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" />
 </ScrollView>
 
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal" >
 
 <EditText
 android:id="@+id/edt_smsg"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:layout_gravity="bottom"
 android:layout_weight="1"
 android:hint="请输入要发送的信息"
 android:shape="rectangle"
 android:inputType="text" >
 
 		</EditText>
 
 <Button
 android:id="@+id/btn_send"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_weight="0.09"
 android:text="@string/send_data" />
 
 </LinearLayout>
 
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal" >
 
 <Button
 android:id="@+id/btn_create_hostspot"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="@string/create_hostspot" />
 
 <Button
 android:id="@+id/btn_close_hostspot"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="@string/close_hostspot" />
 
 <Button
 android:id="@+id/btn_search"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="@string/search" />
 
 <Button
 android:id="@+id/btn_exit"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="退出" />
 </LinearLayout>
 
 
 </LinearLayout>

activity\_wifi\_list.xml文件

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 >
 
 
 <ListView android:id="@+id/listView"
 android:layout_width="match_parent"
 android:layout_height="0dp"
 android:stackFromBottom="true"
 android:layout_weight="2"
 />
 
 
 
 <Button
 android:id="@+id/btn_cancel"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:onClick="OnCancel"
 android:text="取消" />
 
 </LinearLayout>

wifi\_list\_item.xml文件

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="horizontal" android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:minHeight="58dp"
 android:padding="5dp">
 
 <TextView
 android:layout_width="wrap_content"
 android:layout_height="match_parent"
 android:id="@+id/wifi_name"
 android:gravity="center_vertical"
 android:background="#E6E6FA"
 android:textColor="#000"/>
 
 <TextView
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:id="@+id/wifi_signal"
 android:gravity="center_vertical|right"
 android:background="#E6E6FA"
 android:textColor="#000"/>
 
 </LinearLayout>

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmZlaWJ1eWk_size_16_color_FFFFFF_t_70 2][]

五、总结

1、程序通信的大致流程图

设备A开启热点，设备B搜索热点并进行连接。连接成功后，设备B系统发出已连接网络的广播信息，设备B收到后就可以获取到热点的相关信息(IP)，然后可以根据IP，端口号创建与热点通信的socket，然后设备A收到socket通信的请求，接收连接并取得与设备B通信的socket，这样设备A与设备B可以相互收发消息。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmZlaWJ1eWk_size_16_color_FFFFFF_t_70 3][]

2、WIFI相关操作

//获取WIFI管理助手对象 (WIFI重要操作类)  
     WifiManager   wifiManager = (WifiManager) getSystemService(Context.WIFI\_SERVICE);

<table> WiFi相关操作 
 <tbody> 
 <tr> 
 <td>操作</td> 
 <td style="width:511px;">代码</td> 
 <td style="width:300px;">备注</td> 
 </tr> 
 <tr> 
 <td>WIFI是否开启</td> 
 <td style="width:511px;">wifiManager.isWifiEnabled()</td> 
 <td style="width:300px;">返回true说明WIFI已经开启，false：未开启</td> 
 </tr> 
 <tr> 
 <td>开启WIFI</td> 
 <td style="width:511px;">wifiManager.setWifiEnabled(true);</td> 
 <td style="width:300px;">成功开启返回true</td> 
 </tr> 
 <tr> 
 <td>关闭WIFI</td> 
 <td style="width:511px;">wifiManager.setWifiEnabled(false);</td> 
 <td style="width:300px;">成功关闭返回true</td> 
 </tr> 
 <tr> 
 <td>开启热点</td> 
 <td style="width:511px;"> //热点设置 &nbsp; &nbsp; &nbsp; &nbsp; WifiConfiguration config = new WifiConfiguration(); &nbsp; &nbsp; &nbsp; &nbsp; config.SSID = WIFI_HOTSPOT_SSID;//热点名称 &nbsp; &nbsp; &nbsp; &nbsp; 。。。 Method method = wifiManager.getClass().getMethod( &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "setWifiApEnabled", WifiConfiguration.class, Boolean.TYPE); &nbsp;method.invoke(wifiManager, config, true); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; </td> 
 <td style="width:300px;">通过反射访问隐藏的函数</td> 
 </tr> 
 <tr> 
 <td>关闭热点</td> 
 <td style="width:511px;">Method method = wifiManager.getClass().getMethod("getWifiApConfiguration"); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; method.setAccessible(true); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WifiConfiguration config = (WifiConfiguration) method.invoke(wifiManager); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Method method2 = wifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; method2.invoke(wifiManager, config, false);</td> 
 <td style="width:300px;">&nbsp;</td> 
 </tr> 
 <tr> 
 <td>监听</td> 
 <td style="width:511px;"> ServerSocket serverSocket = new ServerSocket(port);//监听本机的port端口 //阻塞，等待设备连接 &nbsp;Socket socket = serverSocket.accept(); </td> 
 <td style="width:300px;">通过socket 进行收发数据</td> 
 </tr> 
 <tr> 
 <td>搜索热点</td> 
 <td style="width:511px;">wifiManager.startScan();//扫描周边热点信息</td> 
 <td style="width:300px;"> 如果搜索到可用的热点系统就会发出广播WifiManager.SCAN_RESULTS_AVAILABLE_ACTION 注册广播就可以接收到广播。 </td> 
 </tr> 
 <tr> 
 <td>自定义广播接收者</td> 
 <td style="width:511px;"> //自定义广播接收者 &nbsp; &nbsp; private BroadcastReceiver receiver = new BroadcastReceiver() &nbsp; &nbsp; { &nbsp; &nbsp; &nbsp; &nbsp; @Override &nbsp; &nbsp; &nbsp; &nbsp; public void onReceive(Context context, Intent intent) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; final String action = intent.getAction();//收到的广播动作 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //根据广播动作做出相应的响应 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //接收到这个广播之后，自定义动作响应 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //dosomething() &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp;} } </td> 
 <td style="width:300px;">说明接收到广播后的动作响应</td> 
 </tr> 
 <tr> 
 <td>注册广播</td> 
 <td style="width:511px;"> IntentFilter intentFilter = new IntentFilter(); &nbsp; &nbsp; &nbsp; &nbsp; intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION); &nbsp; &nbsp; &nbsp; &nbsp; intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION); &nbsp; &nbsp; &nbsp; &nbsp; intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION); &nbsp; &nbsp; &nbsp; &nbsp; intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); &nbsp; &nbsp; &nbsp; &nbsp; registerReceiver(receiver, intentFilter);//注册广播 </td> 
 <td style="width:300px;"> 说明要接收什么类型的广播 (程序结束需要注销广播注册unregisterReceiver(receiver);//注销广播注册) </td> 
 </tr> 
 <tr> 
 <td>获取周边热点信息</td> 
 <td style="width:511px;">&nbsp; &nbsp;// wifi已成功扫描到可用wifi热点，获取热点集合 &nbsp; &nbsp; &nbsp;ArrayList&lt;ScanResult&gt; scanResultList = &nbsp;(ArrayList&lt;ScanResult&gt;)wifiManager.getScanResults(); &nbsp;</td> 
 <td style="width:300px;">有SSID为空的数据，需要自己处理</td> 
 </tr> 
 <tr> 
 <td>连接热点</td> 
 <td style="width:511px;">int netID = wifiManager.addNetwork(config);//根据热点配置添加网络，返回网络身份ID,如果是-1则添加失败，config是热点的相关信息(热点名称，加密类型等) &nbsp; &nbsp; &nbsp; &nbsp; wifiManager.enableNetwork(netID, true);//连接网络(连接成功会有相应的广播信息NetworkInfo.State.CONNECTED)</td> 
 <td style="width:300px;">连接成功后就加入到局域网了，设备在局域网中有唯一的身份IP</td> 
 </tr> 
 <tr> 
 <td>与热点建立通信</td> 
 <td style="width:511px;">Socket socket = new Socket(ip, PORT);//通信socket，用来与热点收发数据</td> 
 <td style="width:300px;">ip是热点的ip，PORT是开启热点设备所监听的端口</td> 
 </tr> 
 <tr> 
 <td>收发消息</td> 
 <td style="width:511px;">//获取数据流 InputStream&nbsp; &nbsp; inputStream = socket.getInputStream();//用来接收消息 OutputStream &nbsp; &nbsp; outputStream = socket.getOutputStream();//用来发送消息</td> 
 <td style="width:300px;">&nbsp;</td> 
 </tr> 
 </tbody> 
</table>

3、多人聊天

多个设备连接同一个热点，热点最为信息中转站 ，使得多个设备之间可以互相通信。（热点可以指定发送消息给某个设备，或者是广播消息）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmZlaWJ1eWk_size_16_color_FFFFFF_t_70 4][]

4、Activity之间传递消息 （例子中将扫描到的热点信息集合传递到另外一个页面显示，ScanResult已经实现了Parcelable接口）

传递数据(Intent的相关函数)

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmZlaWJ1eWk_size_16_color_FFFFFF_t_70 5][]

接收数据 （Intent的相关函数）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmZlaWJ1eWk_size_16_color_FFFFFF_t_70 6][]

a) 传递字符串数据        （Intent的putExtra()函数传递数据，getStringExtra()获取数据）

Intent intent = new Intent(MainActivity.this, WiFiListActivity.class); //从主页面跳转到WIFI列表界面
              intent.putExtra("NAME","liang");//将字符串"liang"传递过去
              startActivityForResult(intent , request_code);  //开始跳转，request_code：自定义请求码

在WiFiListActivity中接收

String name = getIntent().getStringExtra("NAME);//根据键值接收

b) 传递对象集合数据

对于传递对象数据，需要将对象序列化，list集合数据类似  
       对象可序列化的前提就是实现了Serializable或者是Parcelable接口。

1  实现Serializable接口  
用Serializable方式传递Object的语法：bundle.putSerializable(key,object);  
用Serializable方式接收Object的语法：object=(Object) getIntent().getSerializableExtra(key);  
实现Serializable接口就是把对象序列化，然后再传输。

2 需要实现Parcelable接口 
用Parcelable方式传递Object的语法：bundle.putParcelable(key,object); 
用Parcelable方式接收Object的语法：object=(Object) getIntent().getParcelableExtra(key); 
实现Parcelable接口的类比较复杂，Parcelable是个什么东西呢？ 
Android提供了一种新的类型：Parcel，被用作封装数据的容器，封装后的数据可以通过Intent或IPC传递。 除了基本类型以外，只有实现了Parcelable接口的类才能被放入Parcel中。 
实现Parcelable接口需要实现三个方法： 1）writeToParcel方法。该方法将类的数据写入外部提供的Parcel中。 
声明：writeToParcel(Parcel dest, int flags)。 
2）describeContents方法。直接返回0就可以。 
3）静态的Parcelable.Creator<T>接口，本接口有两个方法：createFromParcel(Parcel in) 实现从in中创建出类的实例的功能。 
newArray(int size) 创建一个类型为T，长度为size的数组， returnnew T\[size\];即可。本方法是供外部类反序列化本类数组使用。

5、待完善：很多细节都内有考虑，程序容错性不高，只是简单的演示一个流程。包括资源释放问题都没有处理。

[20181030185843580.gif]: /images/20220503/48ba250f8d7d49eeb84d2ee25539ad7d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmZlaWJ1eWk_size_16_color_FFFFFF_t_70]: /images/20220503/a17ce03c3aa24a81b96608819a284a5f.png
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