package com.example.buyishi.myapplication;

import android.util.Log;

import java.net.NetworkInterface;

import java.net.SocketException;

import java.util.Enumeration;

public class WlanMacAddressGetter {

    private static final String TAG = WlanMacAddressGetter.class.getName();

    public static String getWlanMacAddress() {

        try {

            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();

            while (networkInterfaces.hasMoreElements()) {

                NetworkInterface networkInterface = networkInterfaces.nextElement();

                if (networkInterface.getName().equals("wlan0")) {

                    StringBuilder mac = new StringBuilder();

                    byte[] hardwareAddress = networkInterface.getHardwareAddress();

                    String hex = Integer.toHexString(hardwareAddress[0] & 0xff);

                    if (hex.length() == 1) {

                        mac.append('0');

                    }

                    mac.append(hex);

                    for (int i = 1; i < hardwareAddress.length; ++i) {

                        mac.append(':');

                        hex = Integer.toHexString(hardwareAddress[i] & 0xff);

                        if (hex.length() == 1) {

                            mac.append('0');

                        }

                        mac.append(hex);

                    }

                    return mac.toString();

                }

            }

        } catch (SocketException ex) {

            Log.e(TAG, null, ex);

        }

        return null;

    }

}