获取wifi信息

/**
     * 或者当前连接的wifi信息
     *
     * @return
     */
    private String getConnectWifiSsid() {
        WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        Log.d("wifiInfo", wifiInfo.toString());
        Log.d("SSID", wifiInfo.getSSID());
        return wifiInfo.getSSID();
    }