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

Introduction to DI

In this section, we will look at what DI is, the benefits it provides, and how this concept is applied to an Android application. We will then look at some DI libraries and how they work.

When a class depends on functionality from another class, a dependency is created between the two classes. To invoke the functionality on the class you depend on, you will need to instantiate it, as in the following example:

 class ClassA() {
    private val b: ClassB = ClassB()
    fun executeA() {
class ClassB() {
    fun executeB() {

In this example, ClassA creates a new instance of ClassB, and then when executeA is invoked, it will invoke executeB. This poses a problem because ClassA will have the extra responsibility of creating ClassB. Let&apos...