It simply app that loads a billboard from TheMovieDatabase Api and display inside a RecyclerView as a GridLayout. This repository shows a clean code with MVVM architecture and use professional libraries with Kotlin language. Different models are used for each architecture layer with mappers whose work is transforming the objects to the next layer. Each layer is represented by a module and also exist a core module to be the base of app modules.

To launch the application you need to get an API key from TheMovieDb, (registration is required). You need to create file named secrets.properties like * secrets.defaults.properties* file, and put your api key inside like this:

THEMOVIEDB_API_KEY="your_api_key"

• Kotlin - First class and official programming language for Android development.
• Coroutines - For asynchronous and more.
• Glide - An image loading library for Android.
• Material Components for Android
  • Modular and customizable Material Design UI components for Android.
• Android Architecture Components - Collection of libraries that help you design robust, testable, and maintainable apps.
  • StateFlow - Data objects that notify views when the underlying database changes.
  • ViewModel - Stores UI-related data that isn't destroyed on UI changes.
  • ViewBinding - Generates a binding class for each XML layout file present in that module and allows you to more easily write code that interacts with views.
• Moshi - Library that can be used to convert Java Objects into their JSON representation and JSON string to an equivalent Java object.
• OkHttpClient - HTTP client that allows all requests to the same host to share a socket and response caching avoids the network completely for repeat request.
• Retrofit - Turns HTTP API into a Java interface.
• Dagger 2 - Dependency Injection Framework.
• Hilt - Jetpack Dependency Injection Framework.

Modules have been created to respect the layers of the architecture. First there are 3 main modules: data, domain and presentation*. At the same time, the project has 4 more modules, with prefix ' core', where provide the base of app layers, and there are one 'commons' module that provide some features to the rest of modules.

*Note: Presentation module is called 'App'

This project has test inside :app and :data-remote modules.

Inside :app are tested some cases of ViewModels, and also filters are tested:

• MovieFiltersTest to check if the release year of movies is filtered correctly.
• BillboardViewModelTest to check pagination, loading state and errors.
• MovieDetailsViewModelTest to check success, loading and error states.

Inside :data-remote there are different tests:

• MoshiAdapterTest to check if the date is parsed correctly.
• DateTest to check if the date is mapped correctly by SimpleDateAdapter and by custom extension function.
• TheMovieDbApiServiceTest to check errors when api key is not implemented.
• TheMovieDbMockApiTest to check data source with mock responses.

• Github Actions - The project uses GitHub actions for CI operations such as running automated build and test.
• Renovate - The project uses Renovate bot to keep dependencies up to date.
• Proguard Obfuscation code in release build implemented (but not tested)