Android 6.0以后获取到的Mac地址都是常量：02:00:00:00:00:00

• 蓝牙Mac地址获取

String macAddress = android.provider.Settings.Secure.getString(getContentResolver(), "bluetooth_address");

• Wifi Mac地址获取

String WifiAddress = new BufferedReader(new FileReader(new File("/sys/class/net/wlan0/address"))).readLine();

• RJ45 Mac地址获取

String RJ45Address = new BufferedReader(new FileReader(new File("/sys/class/net/eth0/address"))).readLine();