今天來點乾貨，講講如何通過程式碼連線上指定的wifi。相當於使用程式碼完成使用者在手機WLAN中選擇wifi,並且輸入密碼，然後點選確定的過程。

既然要操縱wifi，就需要使用到wifiManager，我們連線過的wifi的名稱和密碼都可以通過WifiManger來拿到，每個資訊都是封裝到一個ScanResult的類中，然後放到列表中的。

     WifiManager mWifiManager = (WifiManager) getSystemService(WIFI_SERVICE);

1 如何獲取已經連線過的wifi資訊

    mWifiManager.startScan();
    mWifiList = mWifiManager.getScanResults();
    mWificonfiguration = mWifiManager.getConfiguredNetworks();
 

2 去連線以前連線過的wifi

    mWifiManager.enableNetwork(index, true);
    其中的index是netWorkId,就是存在上面的list（mWificonfiguration）中的，目前獲取networkId只能去列表中獲取。

3獲取networkId

    int networkId = mWificonfiguration.get（index）.networkId;
    其中的index,需要自己確定

4上面都是講的連線以前連過的，現在說如何連線從來沒有連線過的wifi.上面都是從列表資訊中拿到了networkId,現在從來沒有連線過的wifi怎麼獲取networId呢？我們可以建立一個wifi的資訊，然後新增到wifiManager中去，然後再獲取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;
}

    上面是建立wifi配置資訊，下面是新增


    int networkId = mWifiManager.addNetwork(wifiConfiguration);
 

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