public boolean isWifiAvailable() {

        ConnectivityManager connectivityManager = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

        return (networkInfo != null && networkInfo.isConnected() && networkInfo

                .getType() == ConnectivityManager.TYPE_WIFI);

    }

    /**

     * 判断当前网络是否是4G网络

     *

     * @param

     * @return boolean

     */

    public boolean is4GAvailable() {

        ConnectivityManager connectivityManager = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();

        if (activeNetInfo != null

                && activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE) {

            TelephonyManager telephonyManager = (TelephonyManager)

                    getActivity().getSystemService(

                            Context.TELEPHONY_SERVICE);

            int networkType = telephonyManager.getNetworkType();

            /** Current network is LTE */

            if (networkType == ) {

                /**此时的网络是4G的*/

                return true;

            }

        }

        return false;

    }