Book Image

Android UI Development with Jetpack Compose - Second Edition

By : Thomas Künneth
5 (1)
Book Image

Android UI Development with Jetpack Compose - Second Edition

5 (1)
By: Thomas Künneth

Overview of this book

Compose has caused a paradigm shift in Android development, introducing a variety of new concepts that are essential to an Android developer’s learning journey. It solves a lot of pain points associated with Android development and is touted to become the default way to building Android apps over the next few years. This second edition has been thoroughly updated to reflect all changes and additions that were made by Google since the initial stable release, and all examples are based on Material 3 (also called Material You). This book uses practical examples to help you understand the fundamental concepts of Jetpack Compose and how to use them when you are building your own Android applications. You’ll begin by getting an in-depth explanation of the declarative approach, along with its differences from and advantages over traditional user interface (UI) frameworks. Having laid this foundation, the next set of chapters take a practical approach to show you how to write your first composable function. The chapters will also help you master layouts, an important core component of every UI framework, and then move to more advanced topics such as animation, testing, and architectural best practices. By the end of this book, you’ll be able to write your own Android apps using Jetpack Compose and Material Design.
Table of Contents (18 chapters)
Part 1: Fundamentals of Jetpack Compose
Part 2: Building User Interfaces
Part 3: Advanced Topics


In this chapter, we looked at important terms and techniques regarding testing. In the first main section, we set up the infrastructure, wrote and ran a simple unit test locally on the development machine, and then turned to Compose specifics. I introduced you to createComposeRule() and createAndroidComposeRule().

Next, we looked at how composable functions are found in a Compose hierarchy, and why making your app accessible also helps in writing better tests. You also learned about actions and assertions. Finally, we added custom entries to the semantics tree.

The final main section explained how to debug a Compose app. We revisited the semantics tree, and I showed you how to take advantage of InspectorInfo and InspectorValueInfo to debug and test custom modifiers.

Android has always embraced different form factors and device classes. Wouldn’t it be great to bring your Jetpack Compose apps to tables and foldables? In Chapter 11, Developing for Different Form...