How to identify android device uniquely as some way is depreciated recently

Question

How can I identify a device uniquely?

I have gone through some links and ans here but confused as most of the answer were written a long time ago and depreciated. what is the best way currently recommended by google?

Answer 1

If i were you i would definitely go for the Device Id,Most safe and secure commonly used in today's Business Logics, U can retreive it by:

import android.provider.Settings.Secure;

private String android_id = Secure.getString(getContext().getContentResolver(),
                                                    Secure.ANDROID_ID); 

Answer 2

You can use the hardware is of device, it's always unique for every device.

How to retrieve device hardware id :

import android.provider.Settings.Secure;

    Settings.Secure.getString(ctx.getContentResolver(), Settings.Secure.ANDROID_ID);