Android 判斷wifi和4G網絡是否開啓

    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);
    }

    /**
     * 判斷當前網絡是不是4G網絡
     *
     * @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 == 13) {
                /**此時的網絡是4G的*/
                return true;
            }
        }
        return false;
    }