While there are quite some good Android sample projects available such as Plaid, Bandhook or Sunflower, there isn't one that only focusses on how to architect/configure a multi-module application.

This repository demonstrates a clearly defined, hierarchical three-layered architecure consisting of

• one App module
• several feature modules: login, dashboard and sharing
• several library modules: actions, ui-components

It shows how to split an app in logical vertical slices, how to handle in-feature and across feature navigation (using navigation components), how each module can be tested and how to organize dependencies and build.gradle files.

To learn more, have a look at the following posts:

• Architecture description & benefits
• Walkthrough of sample code

Note that all code runs and executes, but the screens only contain data in xml preview. This means running the app provides a very "empty experience", but it also keeps the example simple and focussed.