下载完整demo地址

方式一(应用外部包)

Manifest增加权限引用：

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />

引入依赖implementation 'com.blankj:utilcode:1.23.2'
调用DeviceUtils.getMacAddress()

方式二

Manifest增加权限引用（同上）
增加类MacUtil.java：

package com.cxyzy.demo;

import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.text.TextUtils;

import java.io.BufferedReader;
import java.io.FileReader;
import java.net.NetworkInterface;
import java.util.Enumeration;
import java.util.Locale;

public class MacUtil {
    public static String getMac(Context context) {
        String result = "";
        if (context == null) {
            return result;
        } else {
            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
                result = getMacBySystemInterface(context);
            } else if (Build.VERSION.SDK_INT == Build.VERSION_CODES.M) {
                result = getMacByJavaAPI();
                if (TextUtils.isEmpty(result)) {
                    result = getMacShell();
                }
            } else {
                result = getMacByJavaAPI();
                if (TextUtils.isEmpty(result)) {
                    result = getMacBySystemInterface(context);
                }
            }

            return result;
        }
    }

    private static String getMacBySystemInterface(Context context) {
        WifiManager wifiManager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
        if (wifiManager != null) {
            WifiInfo wifiInfo = wifiManager.getConnectionInfo();
            return wifiInfo.getMacAddress();
        } else {
            return "";
        }
    }

    public static String getMacByJavaAPI() {
        try {
            Enumeration networkInterfaces = NetworkInterface.getNetworkInterfaces();

            NetworkInterface networkInterface;
            do {
                if (!networkInterfaces.hasMoreElements()) {
                    return null;
                }

                networkInterface = (NetworkInterface) networkInterfaces.nextElement();
            }
            while (!"wlan0".equals(networkInterface.getName()) && !"eth0".equals(networkInterface.getName()));

            byte[] hardwareAddress = networkInterface.getHardwareAddress();
            if (hardwareAddress != null && hardwareAddress.length != 0) {
                StringBuilder stringBuilder = new StringBuilder();
                for (int i = 0; i < hardwareAddress.length; ++i) {
                    stringBuilder.append(String.format("%02X:", hardwareAddress[i]));
                }

                if (stringBuilder.length() > 0) {
                    stringBuilder.deleteCharAt(stringBuilder.length() - 1);
                }

                return stringBuilder.toString().toLowerCase(Locale.getDefault());
            } else {
                return null;
            }
        } catch (Exception e) {
            return null;
        }
    }

    public static String getMacShell() {
        try {
            String[] result = new String[]{"/sys/class/net/wlan0/address", "/sys/class/net/eth0/address", "/sys/devices/virtual/net/wlan0/address"};

            for (int i = 0; i < result.length; ++i) {
                try {
                    String mac = reaMac(result[i]);
                    if (mac != null) {
                        return mac;
                    }
                } catch (Exception e) {

                }
            }
        } catch (Exception e) {
        }

        return null;
    }

    private static String reaMac(String filePath) {
        String result = null;

        FileReader fileReader = null;
        BufferedReader bufferedReader = null;
        try {
            fileReader = new FileReader(filePath);
            bufferedReader = new BufferedReader(new FileReader(filePath), 1024);
            result = bufferedReader.readLine();
        } catch (Exception e) {
        } finally {
            if (fileReader != null) {
                try {
                    fileReader.close();
                } catch (Exception e) {
                }
            }

            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (Exception e) {
                }
            }

        }

        return result;
    }
}