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。

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);    }}

使用方法

1.初始化工具类

//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

 //打开wifi wifiAdmin.openWifi()；

3.连接热点

 //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

wifiAdmin.closeWifi();

5.创建热点

wifiAdmin.createAp();

6.关闭热点

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

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

2 . 注册广播

<receiver android name=".WifiReceiver">     <intent-filter>         <action android:name="android.net.wifi.RSSI_CHANGED" />         <action android:name="android.net.wifi.STATE_CHANGE" />         <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />     </intent-filter></receiver>

3 . 广播接收者

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)

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

2 . 广播接收者

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……