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Multi-Module Movies

Multi-Module Movies is a The Movie DB project that demonstrates how to build a scalable multi-module architecture for Android apps that use Jetpack Compose.

image screenshots

How to build locally

Add your API key in local.properties file.

tmdb_api_key=API_KEY

Materials

Learn more about this project from the publications linked below.

Technologies

The codebase is written in Kotlin language with Jetpack Compose as a primary UI framework.
In addition, the following technologies are used in the project:

  • Compose Paging - for displaying paginated UI lists.
  • Coil - for loading images.
  • Compose Navigation - for navigating between features.
  • Kotlin Coroutines - for concurrency.
  • Dagger - for dependency injection.
  • Retrofit - for networking.
  • Room - for persistence and offline mode.

Architecture

The project implements a scalable multi-module architecture that aims to achieve the following goals:

  • Separation of concerns - strict isolation and separation of logic between features for easier testability and maintainability of a codebase.
  • Scalability - the architecture is applicable for projects that use hundreds or thousands Gradle/Bazel modules.
  • Dependency graph optimization - allows keeping a developer productivity on a decent level by preventing long build times and ensuring efficient incremental builds.

All the project modules could be separated into 3 types:

  • Feature modules - which hold a logic related to a specific feature and consist of API and Impl modules. Former are framework-agnostic and hold lightweight interfaces as feature entry points.
  • Library modules - commonly used logic by other features.
  • Injector modules - modules that build a dependency graph of the app. E.g. app module.

Feature module architecture