Android 获取Mac地址，兼容6.0以下和6.0以上

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.FileReader;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.Reader;
import java.net.NetworkInterface;
import java.net.SocketException;

/**
 * @param
 * @Comments : 获取Mac地址
 * @Author : Lampo
 * @CreateDate : 2018/11/9 17:49
 * @ModifiedBy : Lampo
 * @ModifiedDate : 2018/11/9 17:49
 * @Modified :
 */

public class MacUtil {

    public static String getMac(Context context) {

        String strMac = null;
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            // 6.0以下
            strMac = getLocalMacAddressFromWifiInfo(context);
            return strMac;
        } else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            //6.0以上7.0以下
            if (PermissionsUtil.getInstance().RPWaireAndRead()) {
                strMac = getMacAddress(context);
            }
            return strMac;
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            if (PermissionsUtil.getInstance().RPWaireAndRead()) {
                //7.0以上
                if (!TextUtils.isEmpty(getMacAddress(context))) {
                    //7.0以上1
                    strMac = getMacAddress(context);
                    return strMac;
                } else if (!TextUtils.isEmpty(getMachineHardwareAddress())) {
                    //7.0以上2
                    strMac = getMachineHardwareAddress();
                    return strMac;
                }
            }
        }

        return "02:00:00:00:00:00";
    }

    /**
     * 根据wifi信息获取本地mac
     *
     * @param context
     * @return
     */
    private static String getLocalMacAddressFromWifiInfo(Context context) {
        WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        WifiInfo winfo = wifi.getConnectionInfo();
        String mac = winfo.getMacAddress();
        return mac;
    }

    /**
     * android 6.0及以上、7.0以下 获取mac地址
     *
     * @param context
     * @return
     */
    private static String getMacAddress(Context context) {

        // 如果是6.0以下，直接通过wifimanager获取
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            String macAddress0 = getMacAddress0(context);
            if (!TextUtils.isEmpty(macAddress0)) {
                return macAddress0;
            }
        }
        String str = "";
        String macSerial = "";
        try {
            Process pp = Runtime.getRuntime().exec(
                    "cat /sys/class/net/wlan0/address");
            InputStreamReader ir = new InputStreamReader(pp.getInputStream());
            LineNumberReader input = new LineNumberReader(ir);
            for (; null != str; ) {
                str = input.readLine();
                if (str != null) {
                    macSerial = str.trim();// 去空格
                    break;
                }
            }
        } catch (Exception ex) {
        }
        if (macSerial == null || "".equals(macSerial)) {
            try {
                return loadFileAsString("/sys/class/net/eth0/address")
                        .toUpperCase().substring(0, 17);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
        return macSerial;
    }

    private static String getMacAddress0(Context context) {
        if (PermissionsUtil.getInstance().RPwifi()) {
            WifiManager wifiMgr = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
            WifiInfo wifiInfo = null;
            try {
                wifiInfo = wifiMgr.getConnectionInfo();
                return wifiInfo.getMacAddress();
            } catch (Exception e) {
            }

        }
        return "";

    }

    private static String loadFileAsString(String fileName) throws Exception {
        FileReader reader = new FileReader(fileName);
        String text = loadReaderAsString(reader);
        reader.close();
        return text;
    }

    private static String loadReaderAsString(Reader reader) throws Exception {
        StringBuilder builder = new StringBuilder();
        char[] buffer = new char[4096];
        int readLength = reader.read(buffer);
        while (readLength >= 0) {
            builder.append(buffer, 0, readLength);
            readLength = reader.read(buffer);
        }
        return builder.toString();
    }

    /**
     * android 7.0及以上 （2）扫描各个网络接口获取mac地址
     */
    private static String getMachineHardwareAddress() {
        String macAddress = null;
        StringBuffer buf = new StringBuffer();
        NetworkInterface networkInterface = null;
        try {
            networkInterface = NetworkInterface.getByName("eth1");
            if (networkInterface == null) {
                networkInterface = NetworkInterface.getByName("wlan0");
            }
            if (networkInterface == null) {
                return "02:00:00:00:00:00";
            }
            byte[] addr = networkInterface.getHardwareAddress();
            for (byte b : addr) {
                buf.append(String.format("%02X:", b));
            }
            if (buf.length() > 0) {
                buf.deleteCharAt(buf.length() - 1);
            }
            macAddress = buf.toString();
        } catch (SocketException e) {
            e.printStackTrace();
            return "02:00:00:00:00:00";
        }
        return macAddress;
    }

}