Thank you for posting this. I hope developpers around here will at least respond to this very interesting approach.
Some Questions:
Is it possible to directly open files from your app, e.g. pdfs?
Is it possible to sort the library after author, title etc. as with a reference manager?
What do you mean by metadata? Information from Manifest.xml?
If I see it right, this is what a lot of people are missing for a long time...
I would be glad if there'd be progress here.
Gogolo