This app was mentioned in 3 comments, with an average of 1.33 upvotes
I don't think it's by the same company but it's styled rather similarly. (although I think their Fight Club app did used to be called d20?)
It functions similar and uses the same XML files as Fight Club, but lacks some of the more intricate details such automatically including class features. Nonetheless, it's a somewhat adequate alternative.
This is one I prefer. Again it's not nearly as comprehensive as the Lion's Den app, but it has auto-leveling and class features. I mostly use it to try out certain builds and check proficiency and what-not, but It's indispensable when my iPad is unavailable.
In my mind I was'nt going to a top right drawer menu thing, the "<" in the sheet is a "go back to Home Screen" kinda button - That could totally be droped out since Androids have back button.
But I really don't know what could be in this right side menu since all chunks of the sheet has his own "=" for show/hide and for editing.
tho, you can get some inspiration with d20
https://play.google.com/store/apps/details?id=io.vokal.d20&hl=en
I like this one.