Book Image

Simplifying Android Development with Coroutines and Flows

By : Jomar Tigcal
Book Image

Simplifying Android Development with Coroutines and Flows

By: Jomar Tigcal

Overview of this book

Coroutines and flows are the new recommended way for developers to carry out asynchronous programming in Android using simple, modern, and testable code. This book will teach you how coroutines and flows work and how to use them in building Android applications, along with helping you to develop modern Android applications with asynchronous programming using real data. The book begins by showing you how to create and handle Kotlin coroutines on Android. You’ll explore asynchronous programming in Kotlin, and understand how to test Kotlin coroutines. Next, you'll learn about Kotlin flows on Android, and have a closer look at using Kotlin flows by getting to grips with handling flow cancellations and exceptions and testing the flows. By the end of this book, you'll have the skills you need to build high-quality and maintainable Android applications using coroutines and flows.
Table of Contents (11 chapters)
1
Part 1 – Kotlin Coroutines on Android
6
Part 2 – Kotlin Flows on Android

Exercise 4.01 – adding tests to coroutines in an Android app

For this exercise, you will be continuing the movie app that you worked on in Exercise 2.01, Using coroutines in an Android app. This application displays the movies that are currently playing in cinemas. You will be adding unit tests for the coroutines in the project by following these steps:

  1. Open the movie app you worked on in Exercise 2.01, Using coroutines in an Android app, in Android Studio.
  2. Go to the app/build.gradle file and add the following dependencies, which will be used for the unit test:
    testImplementation ‘org.mockito.kotlin:mockito-
      kotlin:4.0.0’
    testImplementation ‘androidx.arch.core:core-
      testing:2.1.0’
    testImplementation ‘org.jetbrains.kotlinx:kotlinx-
      coroutines-test:1.6.0’

The first line will add Mockito-Core and Mockito-Kotlin, the second line will add the architecture testing library, and the last...