It uses layoutlib that's already used by the visual editor

Seems like checkboxes don’t render properly in the preview window: they’re always checked, regardless of

checked

parameter. Is it something worth opening an issue for, or it’s expected things like that (whatever that is) won’t work yet?

It would be great if we wouldn't have to rebuild project for this to work 🙂 However from my experience with this lib (and Anko previewer), it was not really possible 😞