In Android 16 QPR1 Beta 2, when you go to select a wallpaper in the Wallpaper & style app (or simply accessed through system settings) you’ll discover a new Wallpaper Studio section up top.

You're most likely best served by using the New Project wizard in Android Studio to create a new app, then using those resources and the samples here as a reference. Android Studio's "Native C++" ...

This SDK provides APIs for all of the essential AR features like motion tracking, environmental understanding, and light estimation. With these capabilities you can build entirely new AR experiences ...