DuoLingo Dynamic Icons on Android

Recently, I have been noticing that the icons for Duolingo changes throughout the day depending whether if I have done my daily exercise:

Originally I thought this feature is called adaptive icons due to its name but it is not. In Android Development, there is a file that contains information about your app such as the permissions, minimum device versions, name of the app and etc in the AndroidManifest.xml. This file also includes the icon to use for the app if provided. Apparently there is something called activity-alias provides more flexibility and allows you to enter the same activity (i.e. think of it as a page or a view in the app). Essentially you can enable or disable different aliases to swap the icons via PackageManager.ComponentEnabledSetting and this is likely the approach that Duolingo uses. They probably run some background process that is hopefully scheduled at certain periods of time such as WorkerManager. I am not too familiar with Android development so most of this is just speculation. It’s been many years since I last wrote an Android Application and it was quite primitive … I hated Android Studio … it killed my poor underperforming laptop