android自动连接wifi——WifiManager

WifiManager工具类：

android包中自带有WifiManager工具类，专门用于wifi管理：

import android.net.wifi.WifiManager;

取得WifiManager对象：

WifiManager mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);

打开WIFI：

if (!mWifiManager.isWifiEnabled()) {
	mWifiManager.setWifiEnabled(true);
}

创建一个WIFI信息：

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;
	}

这里只介绍第三个参数：Type。从代码中可以看出，Type有三个值，分别为1，2，3。WIFI热点是有加密的，加密方式包括：不加密，WEP，WPA三种，1、2、3就分别对应这三种加密方式，方法返回一个WIFI热点信息。

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);
	}

    具体的使用方式如下：

mWifiAdmin.addNetwork(mWifiAdmin.CreateWifiInfo(SSID, password, 3));

判断WIFI是否连接成功：

public int isWifiContected(Context context) {
		ConnectivityManager connectivityManager = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo wifiNetworkInfo = connectivityManager
				.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
		
		Log.v(TAG, "isConnectedOrConnecting = " + wifiNetworkInfo.isConnectedOrConnecting());
		Log.d(TAG, "wifiNetworkInfo.getDetailedState() = " + wifiNetworkInfo.getDetailedState());
		if (wifiNetworkInfo.getDetailedState() == DetailedState.OBTAINING_IPADDR
				|| wifiNetworkInfo.getDetailedState() == DetailedState.CONNECTING) {
			return WIFI_CONNECTING;
		} else if (wifiNetworkInfo.getDetailedState() == DetailedState.CONNECTED) {
			return WIFI_CONNECTED;
		} else {
			Log.d(TAG, "getDetailedState() == " + wifiNetworkInfo.getDetailedState());
			return WIFI_CONNECT_FAILED;
		}
	}

关闭WIFI连接：

if (mWifiManager.isWifiEnabled()) {
	mWifiManager.setWifiEnabled(false);
}