Book Image

Android UI Development with Jetpack Compose

By : Thomas Künneth
Book Image

Android UI Development with Jetpack Compose

By: Thomas Künneth

Overview of this book

Jetpack Compose is Android’s new framework for building fast, beautiful, and reliable native user interfaces. It simplifies and significantly accelerates UI development on Android using the declarative approach. This book will help developers to get hands-on with Jetpack Compose and adopt a modern way of building Android applications. The book is not an introduction to Android development, but it will build on your knowledge of how Android apps are developed. Complete with hands-on examples, this easy-to-follow guide will get you up to speed with the fundamentals of Jetpack Compose such as state hoisting, unidirectional data flow, and composition over inheritance and help you build your own Android apps using Compose. You'll also cover concepts such as testing, animation, and interoperability with the existing Android UI toolkit. By the end of the book, you'll be able to write your own Android apps using Jetpack Compose.
Table of Contents (16 chapters)
Part 1:Fundamentals of Jetpack Compose
Part 2:Building User Interfaces
Part 3:Advanced Topics

Chapter 10: Testing and Debugging Compose Apps

Programming is a very creative process. Implementing great-looking user interfaces (UIs) with slick animations is pure fun with Jetpack Compose. However, making an outstanding app involves more than just writing code. Testing and debugging are equally as important because no matter how carefully you design and implement your app, bugs and glitches are inevitable, at least in non-trivial programs. Yet there is nothing to fear, as there are powerful tools you can wield to check if your code is acting as intended.

This chapter introduces you to these tools. Its main sections are listed here:

  • Setting up and writing tests
  • Understanding semantics
  • Debugging Compose apps

In the first main section, I will walk you through important terms and techniques regarding testing. We will set up the infrastructure, write a simple unit test, and then turn to Compose specifics—for example, createComposeRule() and createAndroidComposeRule...