今天来点干货，讲讲如何通过代码连接上指定的wifi。相当于使用代码完成使用者在手机WLAN中选择wifi,并且输入密码，然后点击确定的过程。
既然要操纵wifi，就需要使用到wifiManager，我们连接过的wifi的名称和密码都可以通过WifiManger来拿到，每个信息都是封装到一个ScanResult的类中，然后放到列表中的。
WifiManager mWifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
1 如何获取已经连接过的wifi信息
mWifiManager.startScan(); mWifiList = mWifiManager.getScanResults(); mWificonfiguration = mWifiManager.getConfiguredNetworks();
2 去连接以前连接过的wifi
mWifiManager.enableNetwork(index, true); 其中的index是netWorkId,就是存在上面的list（mWificonfiguration）中的，目前获取networkId只能去列表中获取。
3获取networkId
int networkId = mWificonfiguration.get（index）.networkId; 其中的index,需要自己确定
4上面都是讲的连接以前连过的，现在说如何连接从来没有连接过的wifi.上面都是从列表信息中拿到了networkId,现在从来没有连接过的wifi怎么获取networId呢？我们可以创建一个wifi的信息，然后添加到wifiManager中去，然后再获取networkId，就ok了。
public WifiConfiguration createWifiInfo(String SSID, String Password, int Type) {
WifiConfiguration configuration = new WifiConfiguration();
configuration.allowedAuthAlgorithms.clear();
configuration.allowedGroupCiphers.clear();
configuration.allowedKeyManagement.clear();
configuration.allowedPairwiseCiphers.clear();
configuration.allowedProtocols.clear();
configuration.SSID = "\"" + SSID + "\"";
WifiConfiguration tempConfig = this.isExsits(SSID);
if(tempConfig != null) {
mWifiManager.removeNetwork(tempConfig.networkId);
}
switch (Type) {
case 1://不加密
configuration.wepKeys[0] = "";
configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
configuration.wepTxKeyIndex = 0;
configuration.priority= 20000;
break;
case 2://wep加密
configuration.hiddenSSID = true;
configuration.wepKeys[0] = "\"" + Password +"\"";
configuration.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
break;
case 3: //wpa加密
configuration.preSharedKey = "\"" + Password + "\"";
configuration.hiddenSSID = true;
configuration.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
configuration.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
configuration.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
configuration.status = WifiConfiguration.Status.ENABLED;
break;
}
return configuration;
}
上面是创建wifi配置信息，下面是添加
int networkId = mWifiManager.addNetwork(wifiConfiguration);比如关掉wifi这一类的方法我也就不在这里多说了，上面的方法我已经封装成了工具类。
源码地址：https://github.com/Blowing/AutoConnectWifi
你的支持，是我坚持的动力，如果觉得有用，请点个赞。谢谢！
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