So if you were to have a preview of the background, do you need to allow your app to use root (like the xposed module) or it's because yours is an android app and not an xposed module?
I would like to have the Jolla Launcher back. I've seen various apps offering swipe-a-like stuff by hooking into various Android APIs (inc. accessibility) but nothing which offers the "full package" as we know it. kubaork - I assume your app does something similar - is your end goal to get similar to the Jolla Launcher?