android代码连接到指定wifi，适合5.0，6.0，7.0系统

//更新或创建WifiConfiguration

public static WifiConfiguration configWifiInfo(Context context, String SSID, String password, int type) {
    WifiConfiguration config = null;
    WifiManager mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    if (mWifiManager != null) {
        List existingConfigs = mWifiManager.getConfiguredNetworks();
        for (WifiConfiguration existingConfig : existingConfigs) {
            if (existingConfig == null) continue;
            if (existingConfig.SSID.equals("\"" + SSID + "\"")  /*&&  existingConfig.preSharedKey.equals("\""  +  password  +  "\"")*/) {
                config = existingConfig;
                break;
            }
        }
    }
    if (config == null) {
        config = new WifiConfiguration();
    }
    config.allowedAuthAlgorithms.clear();
    config.allowedGroupCiphers.clear();
    config.allowedKeyManagement.clear();
    config.allowedPairwiseCiphers.clear();
    config.allowedProtocols.clear();
    config.SSID = "\"" + SSID + "\"";
    // 分为三种情况：0没有密码1用wep加密2用wpa加密
    if (type == 0) {// WIFICIPHER_NOPASSwifiCong.hiddenSSID = false;
        config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
    } else if (type == 1) {  //  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;
    } else if (type == 2) {   // 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.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
        config.allowedPairwiseCiphers
                .set(WifiConfiguration.PairwiseCipher.CCMP);
        config.status = WifiConfiguration.Status.ENABLED;
    }
    return config;
}

/**
*获取热点的加密类型
*/
private int getType(ScanResult scanResult){   

    if (scanResult.capabilities.contains("WPA"))
        type = 2;
    else if (scanResult.capabilities.contains("WEP"))
        type = 1;
    else
        type = 0;

}

//连接到指定wifi时

WifiConfiguration configuration = XlinkUtils.configWifiInfo(context, "SSID", "password", type);
int netId = configuration.networkId;
if (netId == -1) {
    netId = wifiManager.addNetwork(configuration);
}
wifiManager.enableNetwork(netId, true);