Book Image

How to Build Android Apps with Kotlin - Second Edition

By : Alex Forrester, Eran Boudjnah, Alexandru Dumbravan, Jomar Tigcal
5 (1)
Book Image

How to Build Android Apps with Kotlin - Second Edition

5 (1)
By: Alex Forrester, Eran Boudjnah, Alexandru Dumbravan, Jomar Tigcal

Overview of this book

Looking to kick-start your app development journey with Android 13, but don’t know where to start? How to Build Android Apps with Kotlin is a comprehensive guide that will help jump-start your Android development practice. This book starts with the fundamentals of app development, enabling you to utilize Android Studio and Kotlin to get started with building Android projects. You'll learn how to create apps and run them on virtual devices through guided exercises. Progressing through the chapters, you'll delve into Android's RecyclerView to make the most of lists, images, and maps, and see how to fetch data from a web service. You'll also get to grips with testing, learning how to keep your architecture clean, understanding how to persist data, and gaining basic knowledge of the dependency injection pattern. Finally, you'll see how to publish your apps on the Google Play store. You'll work on realistic projects that are split up into bitesize exercises and activities, allowing you to challenge yourself in an enjoyable and attainable way. You'll build apps to create quizzes, read news articles, check weather reports, store recipes, retrieve movie information, and remind you where you parked your car. By the end of this book, you'll have the skills and confidence to build your own creative Android applications using Kotlin.
Table of Contents (24 chapters)
1
Part 1: Android Foundation
6
Part 2: Displaying Network Calls
12
Part 3: Testing and Code Structure
17
Part 4: Polishing and Publishing an App

JUnit

JUnit is a framework for writing unit tests both in Java and Android. It is responsible for how tests are executed, allowing developers to configure their tests. It offers a multitude of features, such as the following:

  • Setup and teardown: These are called before and after each test method is executed, allowing developers to set up relevant data for the test and clear it once the test is executed. They are represented by the @Before and @After annotations.
  • Assertions: These are used to verify the result of an operation against an expected value.
  • Rules: These allow developers to set up inputs that are common for multiple tests.
  • Runners: Using these, you can specify how the tests can be executed.
  • Parameters: These allow a test method to be executed with multiple inputs.
  • Orderings: These specify in which order the tests should be executed.
  • Matchers: These allow you to define patterns that can then be used to validate the results of the subject of...