Track the user not the Hardware. why ??

To detect an user, we might tract the hardware of the device and if we tract usering getDeviceId().

It fails for many reaons,
1. MAC address also bad.
2. ANDOROID_ID also not reliable and a scary user permission.

** Good Solution : **

The simple solution is to track a UNIQUE INSTALLATION, instead of trying to identify the actual
device. Create a unique identifier when the user opens the app for the first time and save it in a
shared preferences file.