Do Android devices have a unique ID, and if so, what is a simple way to access it using Java?
Settings.Secure#ANDROID_ID returns the Android ID as an unique for each user 64-bit hex string.
import android.provider.Settings.Secure;
private String android_id = Secure.getString(getContext().getContentResolver(),
Secure.ANDROID_ID);
Also read Best practices for unique identifiers: https://developer.android.com/training/articles/user-data-ids
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