Android获取设备的唯一ID

Question

I need to restrict app subscription to certain number of devices per user. For this I was trying to get unique id for android phone ( Hardware ). I found below options but all of them has certain problems. Is there any solutions which does'nt have these problems ?

• Imei / Mei numbers using TelephonyManager APIs ( getDeviceId ) - This will be problematic in case of dual sims there might be active and inactive sim slots.
• AndroidId - Will be reset upon factory reset
• Wifi mac number - Need wifi connected to get this number and this will not be there for non wifi devices.
• Advertaising id - Can be reset by user
• Instance id - Can be reset on factory reset
• Sim serial number - Not bind to device instead it is for sim

Answer 1

After searching and thinking I come up with below solution.

MacID can be used as the unique id. MacID can be get using permission android.permission.READ_PHONE_STATE even with Wifi switch off state. I have successfully tested these in few devices and it works fine. My testing is in progress will update here soon.

public static String getDeviceMacId(){
        try {
            List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface nif : all) {
                if (!nif.getName().equalsIgnoreCase("wlan0")) continue;

                byte[] macBytes = nif.getHardwareAddress();
                if (macBytes == null) {
                    return "";
                }

                StringBuilder res1 = new StringBuilder();
                for (byte b : macBytes) {
                    res1.append(String.format("%02X:",b));
                }

                if (res1.length() > 0) {
                    res1.deleteCharAt(res1.length() - 1);
                }
                return res1.toString();
            }
        } catch (Exception ex) {
            //handle exception
        }
        return "";
    }

Reference : https://stackoverflow.com/a/35830358/2788009