Android工具类——获取wifi模块MAC地址

public class MacUtil {

    /**
     * 获取mac地址（适配所有Android版本）
     *
     * @return
     */
    public static String getMac(Context context) {
        String mac = "";
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            mac = getMacDefault(context);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
            mac = getMacAddress();
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            mac = getMacFromHardware();
        }
        return mac;
    }

    /**
     * Android 6.0 之前（不包括6.0）获取mac地址
     * 必须的权限 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
     *
     * @param context * @return
     */
    public static String getMacDefault(Context context) {
        String mac = "";
        if (context == null) {
            return mac;
        }
        WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        WifiInfo info = null;
        try {
            info = wifi.getConnectionInfo();
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (info == null) {
            return null;
        }
        mac = info.getMacAddress();
        if (!TextUtils.isEmpty(mac)) {
            mac = mac.toUpperCase(Locale.ENGLISH);
        }
        return mac;
    }


    /**
     * Android 6.0-Android 7.0 获取mac地址
     * android 6.0以后 将不再能通过 wifimanager 获取mac，获取到的mac将是固定的：02:00:00:00:00:00 。android sdk后来做了6.0适配，通过cat /sys/class/net/wlan0/address，可以在6.0上获取mac地址
     */
    public static String getMacAddress() {
        String macSerial = null;
        String str = "";

        try {
            Process pp = Runtime.getRuntime().exec("cat/sys/class/net/wlan0/address");
            InputStreamReader ir = new InputStreamReader(pp.getInputStream());
            LineNumberReader input = new LineNumberReader(ir);

            while (null != str) {
                str = input.readLine();
                if (str != null) {
                    macSerial = str.trim();//去空格
                    break;
                }
            }
        } catch (IOException ex) {
            // 赋予默认值
            ex.printStackTrace();
        }

        return macSerial;
    }

    /**
     * Android 7.0之后获取Mac地址
     * 遍历循环所有的网络接口，找到接口是 wlan0
     * 必须的权限 <uses-permission android:name="android.permission.INTERNET"></uses-permission>
     *
     * @return
     */
    public static String getMacFromHardware() {
        String strMacAddr = null;
        try {
            //获得IpD地址
            InetAddress ip = getLocalInetAddress();
            byte[] b = NetworkInterface.getByInetAddress(ip).getHardwareAddress();
            StringBuffer buffer = new StringBuffer();
            for (int i = 0; i < b.length; i++) {
                if (i != 0) {
                    buffer.append(':');
                }
                String str = Integer.toHexString(b[i] & 0xFF);
                buffer.append(str.length() == 1 ? 0 + str : str);
            }
            strMacAddr = buffer.toString().toUpperCase();
        } catch (Exception e) {

        }
        return strMacAddr;

    }

    /**
     * 获取移动设备本地IP
     *
     * @return
     */
    private static InetAddress getLocalInetAddress() {
        InetAddress ip = null;
        //列举
        Enumeration<NetworkInterface> en_netInterface = null;
        try {
            en_netInterface = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException e) {
            e.printStackTrace();
        }
        while (en_netInterface.hasMoreElements()) {
            //是否还有元素
            NetworkInterface ni = (NetworkInterface) en_netInterface.nextElement();//得到下一个元素
            Enumeration<InetAddress> en_ip = ni.getInetAddresses();//得到一个ip地址的列举
            while (en_ip.hasMoreElements()) {
                ip = en_ip.nextElement();
                if (!ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1)
                    break;
                else ip = null;
            }
            if (ip != null) {
                break;
            }
        }
        return ip;
    }

}