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Architecture samples

A collection of samples to discuss and showcase different architectural tools and patterns for Android apps.
Updated 1 month ago

Android Architecture Samples

These samples showcase different architectural approaches to developing Android apps. In its different branches you'll find the same app (a TODO app) implemented with small differences.

In this branch you'll find:

  • User Interface built with Jetpack Compose
  • A single-activity architecture, using Navigation Compose.
  • A presentation layer that contains a Compose screen (View) and a ViewModel per screen (or feature).
  • Reactive UIs using Flow and coroutines for asynchronous operations.
  • A data layer with a repository and two data sources (local using Room and a fake remote).
  • Two product flavors, mock and prod, to ease development and testing.
  • A collection of unit, integration and e2e tests, including "shared" tests that can be run on emulator/device.
  • Dependency injection using Hilt.


This project hosts each sample app in separate repository branches. For more information, see the file in each branch.

Stable samples - Kotlin

Sample Description
main This branch
service-locator A simple setup that removes Hilt in favor of a service locator
livedata Uses LiveData instead of StateFlow as the data stream solution
usecases Adds a new domain layer that uses UseCases for business logic (not using Compose yet)
views Uses Views instead of Jetpack Compose to render UI elements on the screen
views-hilt Uses Views and Hilt instead together



Why a to-do app?

The app in this project aims to be simple enough that you can understand it quickly, but complex enough to showcase difficult design decisions and testing scenarios. For more information, see the app's specification.

What is it not?

Who is it for?

  • Intermediate developers and beginners looking for a way to structure their app in a testable and maintainable way.
  • Advanced developers looking for quick reference.

Opening a sample in Android Studio

To open one of the samples in Android Studio, begin by checking out one of the sample branches, and then open the root directory in Android Studio. The following series of steps illustrate how to open the usecases sample.

Clone the repository:

git clone

This step checks out the master branch. If you want to change to a different sample:

git checkout usecases

Note: To review a different sample, replace usecases with the name of sample you want to check out.

Finally open the architecture-samples/ directory in Android Studio.


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