alibaba/vlayout ? reverse-engineered prompt

Build me an Android RecyclerView layout library that lets me mix different kinds of sections in one screen, like normal lists, grids, sticky headers, fixed items, and a waterfall style gallery.

I want it to feel easy to use in an app, so I can plug in different section behaviors without writing a bunch of custom layout code every time. Please include a simple demo screen that shows how the same RecyclerView can scroll through several layout styles together, and make it clear how to add new sections or custom layouts later.

If anything needs current Android setup details, look up the latest docs online. Also include basic setup notes and a short example so I can see how to wire it up in a real project.