《Android应用开发揭底》里面关于wifi的范例

import java.util.List;  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;  public class WifiAdmin  {      //定义WifiManager对象      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);                        }      }      //关闭WIFI      public void CloseWifi()      {          if (!mWifiManager.isWifiEnabled())          {              mWifiManager.setWifiEnabled(false);           }      }      //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);      }      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)      {          int wcgID = mWifiManager.addNetwork(wcg);           mWifiManager.enableNetwork(wcgID, true);       }      //断开指定ID的网络      public void DisconnectWifi(int netId)      {          mWifiManager.disableNetwork(netId);          mWifiManager.disconnect();      }  }