Reading and writing data

This is a small app that:

reads an HTML file from /res/raw and shows the text on the screen;
contains a converter that stores numbers entered and their conversions to file;
stores the last number converted to SharedPreferences;
shows the contents of that file in a list.

Two versions of the app:

MainActivityBasic: Classic app that uses different activities
MainActivity: App that uses the Bottom Navigation template

use fragments

Choose which version to use by setting the LAUNCHER activity in the file AndroidManifest.xml