This app was mentioned in 2 comments, with an average of 1.50 upvotes
Basicamente, pegas num descompilador de java.
https://stackoverflow.com/a/6081365/2316528
Eu nao corri a app, mas analisando o codigo dava pra ver que era apenas um form/activity feito as 3 pancadas e depois 3 XML que sao os livros, tirados do Project Gutemberg.
Porque não usar antes isto ? https://play.google.com/store/apps/details?id=com.pentaloop.gutenberg&hl=pt_PT
I've never tried the app myself, but Gutenberg Books has a bunch of classics.
https://play.google.com/store/apps/details?id=com.pentaloop.gutenberg