Android Device ID change while device factory reset

Question

I need a Unique ID or Number all time, If device formate or flash.

Answer 1

For Android development, you can use a universally unique identifier (UUID) to generate a unique ID that can persist even if the device is formatted or flashed.

import java.util.UUID;

UUID uuid = UUID.randomUUID();
String uniqueId = uuid.toString();

Answer 2

Try using Mac address of the device