The easiest way to get a unique ID of any Android device

On a device first boot, a unique random value is generated and stored. It’s a 64-bit number called ANDROID_ID. It should remain constant for a device lifetime. The value is available for smartphones and tablets.

Use the following code to retrieve the value:

String androidId = Settings.Secure.getString(getContentResolver(),
                   Settings.Secure.ANDROID_ID);

Caution: The id can be changed after performing a factory reset on the device.

😄 Happy Coding… 😄