Guide to Android app architecture

1. Guide to app architecture

   Separation of concerns, drive UI from models, single source of truth and unidirectional data flow.

2. UI layer

   UI state, state holders, ViewModel and UI elements.

3. Domain layer

   Optional use cases that encapsulate business logic.

4. Data layer

   Repositories, data sources and exposing data.

5. Offline-first apps

   Local source of truth, sync and conflict handling.

6. UI events

   Handling user and ViewModel events and one-off effects.

7. Architecture recommendations

   Best-practice recommendations for each layer.

8. Modularization

   Multi-module structure, coupling and cohesion.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.