Android 6的MAC获取

问题：Android 6.0的手机无法通过低版本的Mac地址获取方式获取Mac地址

WifiInfo.getMacAddress() 或者 BluetoothAdapter.getAddress()

原因：由于安全方面的原因，Google在Android 6.0以后的SDK中将上述两个方法的返回值修改为了固定的“02:00:00:00:00:00”

但是可以从NetworkInterface.getNetworkInterfaces()获取（基于调用：cat /sys/class/net/wlan0/address）

解决方案：

    public static String getMac() {
        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            while (interfaces.hasMoreElements()) {
                NetworkInterface iF = interfaces.nextElement();

                byte[] addr = iF.getHardwareAddress();
                if (addr == null || addr.length == 0) {
                    continue;
                }

                StringBuilder buf = new StringBuilder();
                for (byte b : addr) {
                    buf.append(String.format("%02X:", b));
                }
                if (buf.length() > 0) {
                    buf.deleteCharAt(buf.length() - 1);
                }
                String mac = buf.toString();
                Log.d("mac", "interfaceName=" + iF.getName() + ", mac=" + mac);
                if (iF.getName().equals("wlan0")) {
                    return mac;
                } else {
                    return Build.UNKNOWN;
                }
            }
        } catch (SocketException e) {
            return Build.UNKNOWN;
        }
        return Build.UNKNOWN;
    }

感恩！