转-Android中自动连接到指定SSID的Wi-Fi

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 mWifiList;  
    // 网络连接列表   
    private List 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);  
        }  
    }  
  
    // 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 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 getWifiList() {  
        return mWifiList;  
    }  
  
    // 查看扫描结果   
    public StringBuilder lookUpScan() {  
        StringBuilder stringBuilder = new StringBuilder();  
        for (int i = 0; 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);  
     boolean b =  mWifiManager.enableNetwork(wcgID, true);  
     System.out.println("a--" + wcgID); 
     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，只验证过没有密码的情况： 
  
    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 existingCOnfigs= mWifiManager.getConfiguredNetworks();   
           for (WifiConfiguration existingConfig : existingConfigs)    
           {   
             if (existingConfig.SSID.equals("/""+SSID+"/""))   
             {   
                 return existingConfig;   
             }   
           }   
        return null;    
    } 
}

WifiConfiguration tempCOnfig= this.IsExsits(SSID);          

          if(tempConfig != null) { 

          mWifiManager.removeNetwork(tempConfig.networkId); 

          }

public class Test_wifiActivity extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
         
        WifiAdmin wifiAdmin = new WifiAdmin(this); 
        wifiAdmin.openWifi(); 
        wifiAdmin.addNetwork(wifiAdmin.CreateWifiInfo("XXX", "XXX", 3)); 
    } 
}