Book Image

Clean Android Architecture

By : Alexandru Dumbravan
Book Image

Clean Android Architecture

By: Alexandru Dumbravan

Overview of this book

As an application’s code base increases, it becomes harder for developers to maintain existing features and introduce new ones. In this clean architecture book, you'll learn to identify when and how this problem emerges and how to structure your code to overcome it. The book starts by explaining clean architecture principles and Android architecture components and then explores the tools, frameworks, and libraries involved. You’ll learn how to structure your application in the data and domain layers, the technologies that go in each layer, and the role that each layer plays in keeping your application clean. You’ll understand how to arrange the code into these two layers and the components involved in assembling them. Finally, you'll cover the presentation layer and the patterns that can be applied to have a decoupled and testable code base. By the end of this architecture book, you'll be able to build an application following clean architecture principles and have the knowledge you need to maintain and test the application easily.
Table of Contents (15 chapters)
Part 1 – Introduction
Part 2 – Domain and Data Layers
Part 3 – Presentation Layer

Using Hilt to manage dependencies

In this section, we will discuss the Hilt DI library, how we can use it in an Android application, and the extra features it provides on top of the Dagger 2 library.

Hilt is a library built on top of Dagger 2 with a specific focus on Android applications. This is to remove the extra boilerplate code that was required to use Dagger 2 in an application. Hilt removes the need to use @Component and @Subcomponent annotated classes and in turn offers new annotations:

  • When injecting dependencies in Android classes, we can use @HiltAndroidApp for Application classes, @AndroidEntryPoint for activities, fragments, services, broadcast receivers, and views, and @HiltViewModel for ViewModels.
  • When using the @Module annotation, we now have the option to use @InstallIn and specify an @DefineComponent annotated class, which represents the component the module will be added to. Hilt provides a set of useful components to install modules in:
    • @SingletonComponent...