Since your request mixes a search for a digital copy of (Kniga Ilaia) with a prompt to "develop a story," I’ve prepared a short story inspired by the film's post-apocalyptic atmosphere.
Kael knew he had to keep moving west. The battery was at 12%, and the sun was three days away. But as long as the screen flickered, the world wasn't truly dark yet.
If you are looking for the actual movie or a novelization for your Android device, you can typically find it on platforms like the Google Play Store for rental/purchase or through ebook readers like FBReader if you have a compatible file. The Last Echo: A Story Inspired by "The Book of Eli"