android Wifi自動鏈接

public class WifiConnectUtil

{

private WifiManager wifiManager;

// 定義幾種加密方式，一種是WEP，一種是WPA，還有沒有密碼的狀況

public enum WifiCipherType

{

WIFICIPHER_WEP, WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID

}

// 構造函數

public WifiConnectUtil(WifiManager wifiManager)

{

this.wifiManager = wifiManager;

}

// 打開wifi功能

private boolean openWifi()

{

boolean bRet = true;

if (!wifiManager.isWifiEnabled())

{

bRet = wifiManager.setWifiEnabled(true);

}

return bRet;

}

// 提供一個外部接口，傳入要鏈接的無線網

public boolean connect(String SSID, String Password, WifiCipherType Type)

{

if (!openWifi())

{

return false;

}

// 開啓wifi功能須要一段時間(我在手機上測試通常須要1-3秒左右)，因此要等到wifi

// 狀態變成WIFI_STATE_ENABLED的時候才能執行下面的語句

while (wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLING)

{

try

{

// 爲了不程序一直while循環，讓它睡個100毫秒在檢測……

Thread.currentThread();

Thread.sleep(100);

} catch (InterruptedException ie)

{

ie.printStackTrace();

}

}

WifiConfiguration wifiConfig = CreateWifiInfo(SSID, Password, Type);

//

if (wifiConfig == null)

{

return false;

}

WifiConfiguration tempConfig = IsExsits(SSID);

if (tempConfig != null)

{

wifiManager.removeNetwork(tempConfig.networkId);

}

int netID = wifiManager.addNetwork(wifiConfig);

boolean bRet = wifiManager.enableNetwork(netID, false);

return bRet;

}

private WifiConfiguration IsExsits(String SSID)

{

List<WifiConfiguration> existingConfigs = wifiManager.getConfiguredNetworks();

for (WifiConfiguration existingConfig : existingConfigs)

{

if (existingConfig.SSID.equals("\"" + SSID + "\""))

{

return existingConfig;

}

}

return null;

}

private WifiConfiguration CreateWifiInfo(String SSID, String Password, WifiCipherType Type)

{

WifiConfiguration config = new WifiConfiguration();

config.allowedAuthAlgorithms.clear();

config.allowedGroupCiphers.clear();

config.allowedKeyManagement.clear();

config.allowedPairwiseCiphers.clear();

config.allowedProtocols.clear();

config.SSID = "\"" + SSID + "\"";

if (Type == WifiCipherType.WIFICIPHER_NOPASS)

{

config.wepKeys[0] = "";

config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);

config.wepTxKeyIndex = 0;

}

if (Type == WifiCipherType.WIFICIPHER_WEP)

{

config.preSharedKey = "\"" + Password + "\"";

config.hiddenSSID = true;

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 == WifiCipherType.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.status = WifiConfiguration.Status.ENABLED;

} else

{

return null;

}

return config;

}