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。

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287

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

?

1 2 3 4 5 6 7 8 9 10 11

//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

?

1 2	//打开wifi wifiAdmin.openWifi()；

3.连接热点

?

1 2 3 4 5 6 7 8 9 10 11

//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

?

1	wifiAdmin.closeWifi();

5.创建热点

?

1	wifiAdmin.createAp();

6.关闭热点

?

1	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

?

1 2	<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

?

1 2 3 4 5 6 7

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

3 . 广播接收者

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

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)

?

1 2 3 4 5

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

2 . 广播接收者

?

1 2 3 4 5 6 7 8 9 10

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……