Hello : ereaders for the road

Hello,

I'm interested on ereaders not only for books.
They are also a great tool for outdoor activity because it's very easy to read under the sunlight and the battery last very long.

At this moment, early 2020, I would like to run my android application (I have my source code) on a paperwhite (a waterproof ereader).

Thanks in advance for all the help.

Pedro from Paris.