Book reader: How to make books separate applications?

Question

Android

Good afternoon!
I was faced with the task of developing an Android reader for my book format. By itself, this format is just a set of html, css, js. But the books themselves are not just text and pictures, they have interactive exercises like testing, dragging, drawing, etc. That is, I cannot use existing formats. We thought of 2 options for distributing books: in the form of files (that is, using the reader, we open a file with a book and read), or using separate applications (that is, we have the main reader application and many separate applications with books that themselves themselves are not programs with an Activity, but simply add a new book to the list of books).
Actually the question is: 1. How to create such a book application (without a launch icon in the application list, and so that it installs the book, when uninstalled, respectively, deleted)? 2. How can a reader access such books?
I hope for your help!

Answer 1

Hello.
Specify, do you want your reader to collect apk on the device itself?
This is not very logical and good.
As an option - you can make an application (let's say we take ionic, if you are friends with angular, then it's just perfect), there you specify links to repositories with already packed books (or just a link to a packed file).
And about the fact that the application itself installs and deletes books, does not display an icon, etc. (that is, which will be like apk) - then the application must have root access. Nothing without this.

Answer 2

make your own reader, for your format and do something like an OPDS catalog for books inside the program