Android WiFi/WiFi热点开发总结

首先看一下WiFi的自我介绍：

Wi-Fi是一种允许电子设备连接到一个无线局域网（WLAN）的技术，通常使用2.4G UHF或5G SHF ISM 射频频段。连接到无线局域网通常是有密码保护的；但也可是开放的，这样就允许任何在WLAN范围内的设备可以连接上。

wifi可以说是Android开发中非常重要的一部分了，这里用到了一个WifiAdmin工具类。

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package com.qdzn.home.wifi;
 
import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;
 
import java.lang.reflect.Method;
import java.util.List;
 
/**
 * wifi工具类
 */
public class WifiAdmin {
 
    public static final String SSID = "nexus";
    public static final String PassWord = "12345678";
    private WifiManager mWifiManager;
    // 定义WifiInfo对象
    private WifiInfo mWifiInfo;
    // 扫描出的网络连接列表
    private List<scanresult> mWifiList;
    // 网络连接列表
    private List<wificonfiguration> mWifiConfiguration;
    // 定义一个WifiLock
    WifiLock mWifiLock;
 
    // 构造器
    public WifiAdmin(Context context) {
        // 取得WifiManager对象
        mWifiManager = (WifiManager) context
                .getSystemService(Context.WIFI_SERVICE);
        // 取得WifiInfo对象
        mWifiInfo = mWifiManager.getConnectionInfo();
    }
 
    // 打开WIFI
    public void openWifi() {
        if (!mWifiManager.isWifiEnabled()) {
            mWifiManager.setWifiEnabled(true);
            //开始扫描WIFI
            startScan();
        }
    }
 
    // 关闭WIFI
    public void closeWifi() {
        if (mWifiManager.isWifiEnabled()) {
            mWifiManager.setWifiEnabled(false);
        }
    }
 
    //创建热点
    public void createAp() {
        if (mWifiManager.isWifiEnabled()) {
            mWifiManager.setWifiEnabled(false);
        }
        try {
            WifiConfiguration apConfiguration = new WifiConfiguration();
            apConfiguration.SSID = WifiAdmin.SSID;
            apConfiguration.preSharedKey = WifiAdmin.PassWord;
            apConfiguration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
            Method method = mWifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
            method.invoke(mWifiManager, apConfiguration, true);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 关闭WiFi热点
     */
    public void closeWifiAp() {
        if (isWifiApEnabled()) {
            try {
                Method method = mWifiManager.getClass().getMethod("getWifiApConfiguration");
                method.setAccessible(true);
                WifiConfiguration config = (WifiConfiguration) method.invoke(mWifiManager);
                Method method2 = mWifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
                method2.invoke(mWifiManager, config, false);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
 
    /**
     * 判断热点是否打开
     *
     * @return
     */
    public boolean isWifiApEnabled() {
        try {
            Method method = mWifiManager.getClass().getMethod("isWifiApEnabled");
            method.setAccessible(true);
            return (Boolean) method.invoke(mWifiManager);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
 
    // 检查当前WIFI状态
    public int checkState() {
        return mWifiManager.getWifiState();
    }
 
    // 锁定WifiLock
    public void acquireWifiLock() {
        mWifiLock.acquire();
    }
 
    // 解锁WifiLock
    public void releaseWifiLock() {
        // 判断时候锁定
        if (mWifiLock.isHeld()) {
            mWifiLock.acquire();
        }
    }
 
    // 创建一个WifiLock
    public void creatWifiLock() {
        mWifiLock = mWifiManager.createWifiLock("Test");
    }
 
    // 得到配置好的网络
    public List<wificonfiguration> getConfiguration() {
        return mWifiConfiguration;
    }
 
    // 指定配置好的网络进行连接
    public void connectConfiguration(int index) {
        // 索引大于配置好的网络索引返回
        if (index > mWifiConfiguration.size()) {
            return;
        }
        // 连接配置好的指定ID的网络
        mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId, true);
    }
 
    /**
     * 扫描WIFI
     */
    public void startScan() {
        mWifiManager.startScan();
        // 得到扫描结果
        mWifiList = mWifiManager.getScanResults();
        // 得到配置好的网络连接
        mWifiConfiguration = mWifiManager.getConfiguredNetworks();
    }
 
    // 得到网络列表
    public List<scanresult> getWifiList() {
        return mWifiList;
    }
 
    // 查看扫描结果
    public StringBuilder lookUpScan() {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < mWifiList.size(); i++) {
            stringBuilder
                    .append("Index_" + new Integer(i + 1).toString() + ":");
            // 将ScanResult信息转换成一个字符串包
            // 其中把包括：BSSID、SSID、capabilities、frequency、level
            stringBuilder.append((mWifiList.get(i)).toString());
            stringBuilder.append("/n");
        }
        return stringBuilder;
    }
 
    // 得到MAC地址
    public String getMacAddress() {
        return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress();
    }
 
    // 得到接入点的BSSID
    public String getBSSID() {
        return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
    }
 
    // 得到IP地址
    public int getIPAddress() {
        return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();
    }
 
    // 得到连接的ID
    public int getNetworkId() {
        return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId();
    }
 
    // 得到WifiInfo的所有信息包
    public String getWifiInfo() {
        return (mWifiInfo == null) ? "NULL" : mWifiInfo.toString();
    }
 
    // 添加一个网络并连接
    public void addNetwork(WifiConfiguration wcg) {
        System.out.println("进行添加网络：");
        int wcgID = mWifiManager.addNetwork(wcg);
        boolean b = mWifiManager.enableNetwork(wcgID, true);
        System.out.println("b--" + b);
    }
 
    // 断开指定ID的网络
    public void disconnectWifi(int netId) {
        mWifiManager.disableNetwork(netId);
        mWifiManager.disconnect();
    }
 
    // 然后是一个实际应用方法
    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 + """;
        WifiConfiguration tempConfig = this.IsExsits(SSID);
        if (tempConfig != null) {
            mWifiManager.removeNetwork(tempConfig.networkId);
        }
 
        if (Type == 1) // WIFICIPHER_NOPASS
        {
            config.wepKeys[0] = "";
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
            config.wepTxKeyIndex = 0;
        }
        if (Type == 2) // WIFICIPHER_WEP
        {
            config.hiddenSSID = true;
            config.wepKeys[0] = """ + Password + """;
            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;
        }
        if (Type == 3) // WIFICIPHER_WPA
        {
            config.preSharedKey = """ + Password + """;
            config.hiddenSSID = true;
            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;
        }
 
        return config;
    }
 
    private WifiConfiguration IsExsits(String SSID) {
        List<wificonfiguration> existingConfigs = mWifiManager
                .getConfiguredNetworks();
        for (WifiConfiguration existingConfig : existingConfigs) {
            System.out.println(existingConfig.SSID);
            if (existingConfig.SSID.equals(""" + SSID + """)) {
                System.out.println("拿到了相同配置对象：" + existingConfig.SSID);
                return existingConfig;
            }
        }
        return null;
    }
 
    /**
     * ip地址转换
     * @param i
     * @return
     */
    public static String intToIp(int i) {
        return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "." + ((i >> 24) & 0xFF);
    }
}</wificonfiguration></scanresult></wificonfiguration></wificonfiguration></scanresult>

使用方法

1.初始化工具类

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//首先需要获取到wifi管理者，初始化工具类
 WifiAdmin wifiAdmin = new WifiAdmin(this);
 
  // 工具类初始化
    public WifiAdmin(Context context) {
        // 取得WifiManager对象
        mWifiManager = (WifiManager) context
                .getSystemService(Context.WIFI_SERVICE);
        // 取得WifiInfo对象
        mWifiInfo = mWifiManager.getConnectionInfo();
    }

2.开启wifi

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//打开wifi
wifiAdmin.openWifi()；

3.连接热点

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//连接热点之前我们需要先扫描周围热点
   public void connect() {
   wifiAdmin.startScan();
       new Thread(new Runnable() {
           @Override
           public void run() {
                          wifiAdmin.addNetwork(wifiAdmin.CreateWifiInfo(WifiAdmin.SSID, WifiAdmin.PassWord, 3));
           }
       }).start();
 
   }

4.关闭Wifi

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wifiAdmin.closeWifi();

5.创建热点

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wifiAdmin.createAp();

6.关闭热点

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wifiAdmin.closeWifiAp();

对于Wifi和Wifi热点的基本使用就这些，重点都在WifiAdmin工具类中，下面在来说说如何使用广播来监听他们的状态改变。

注册广播监听WIFI连接状态改变

1 . 需要的权限

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

2 . 注册广播

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<receiver android="" name=".WifiReceiver">
     <intent-filter>
          
          
          
     </action></action></action></intent-filter>
</receiver>

3 . 广播接收者

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public class WifiReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
            NetworkInfo info =intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
            if (info.getState().equals(NetworkInfo.State.DISCONNECTED)) {
                /**
                 * wifi断开连接
                 */
            } else if (info.getState().equals(NetworkInfo.State.CONNECTED)) {
                WifiManager wifiManager=(WifiManager)context.getSystemService(Context.WIFI_SERVICE);
                WifiInfo wifiInfo = wifiManager.getConnectionInfo();
                /**
                 * wifi以连接wifiInfo.getSSID();获取连接的wifi名称
                 */
                     Log.d("TAG",wifiInfo.getSSID());
                }
            }else if(intent.getAction().equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {//wifi打开与否
            int wifistate = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);
            if (wifistate == WifiManager.WIFI_STATE_DISABLED) {
                /**
                 * 系统关闭wifi
                 */
            } else if (wifistate == WifiManager.WIFI_STATE_ENABLED) {
                /**
                 * 系统开启wifi
                 */
            }
        }
    }
}

以上就是根据广播接受者来获取WIFI的状态，下面在来说说监听WIFI热点的状态

1.广播注册(需要注意的是这个Action自动提示里根本就找不到，貌似是被隐藏了起来)

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<receiver android:name="com.qdzn.home.wifi.WifiApReceiver">
    <intent-filter>
         
    </action></intent-filter>
</receiver>

2 . 广播接收者

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public class WifiApReceiver extends BroadcastReceiver {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if ("android.net.wifi.WIFI_AP_STATE_CHANGED".equals(action)) {
            //便携式热点的状态为：10---正在关闭；11---已关闭；12---正在开启；13---已开启
            int state = intent.getIntExtra("wifi_state", 0);
            Log.d("TAG", state + "---");
        }
    }
}

以上就是使用广播接收者来获取WIFI和WIFI热点的状态……

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原文地址：https://www.cnblogs.com/Free-Thinker/p/7550649.html