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  • Book Overview & Buying Simplifying Android Development with Coroutines and Flows
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Simplifying Android Development with Coroutines and Flows

Simplifying Android Development with Coroutines and Flows

By : Tigcal
5 (2)
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Simplifying Android Development with Coroutines and Flows

Simplifying Android Development with Coroutines and Flows

5 (2)
By: Tigcal
Buy this Book

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)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Download the example code files
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Conventions used
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Get in touch
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Share Your Thoughts
1
Part 1 – Kotlin Coroutines on Android
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Part 1 – Kotlin Coroutines on Android
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2
Chapter 1: Introduction to Asynchronous Programming in Android
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Chapter 1: Introduction to Asynchronous Programming in Android
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Technical requirements
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Understanding asynchronous programming
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Exploring threads, AsyncTasks, and Executors
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The new way to do it – coroutines and flows
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Summary
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Further reading
3
Chapter 2: Understanding Kotlin Coroutines
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Chapter 2: Understanding Kotlin Coroutines
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Technical requirements
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Creating coroutines in Android
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Exploring coroutine builders, scopes, and dispatchers
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Understanding coroutine contexts and jobs
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Exercise – using coroutines in an Android app
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Summary
4
Chapter 3: Handling Coroutine Cancelations and Exceptions
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Chapter 3: Handling Coroutine Cancelations and Exceptions
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Technical requirements
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Canceling coroutines
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Managing coroutine timeouts
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Catching exceptions in coroutines
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Summary
5
Chapter 4: Testing Kotlin Coroutines
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Chapter 4: Testing Kotlin Coroutines
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Technical requirements
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Setting up an Android project for testing coroutines
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Unit testing suspending functions
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Testing coroutines
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Exercise 4.01 – adding tests to coroutines in an Android app
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Summary
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Further reading
6
Part 2 – Kotlin Flows on Android
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Part 2 – Kotlin Flows on Android
7
Chapter 5: Using Kotlin Flows
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Chapter 5: Using Kotlin Flows
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Technical requirements
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Using Flows in Android
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Creating Flows with Flow builders
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Using operators with Flows
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Buffering and combining flows
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Exploring StateFlow and SharedFlow
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Exercise 5.01 – Using Kotlin Flow in an Android app
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Summary
8
Chapter 6: Handling Flow Cancelations and Exceptions
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Chapter 6: Handling Flow Cancelations and Exceptions
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Technical requirements
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Canceling Kotlin Flows
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Retrying tasks with Flow
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Catching exceptions in Flows
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Handling Flow completion
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Exercise 6.01 – Handling Flow exception in an Android app
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Summary
9
Chapter 7: Testing Kotlin Flows
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Chapter 7: Testing Kotlin Flows
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Technical requirements
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Setting up an Android project for testing Flows
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Testing Kotlin Flows
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Testing Flows with Turbine
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Exercise 7.01 – Adding tests to Flows in an Android app
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Summary
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Why subscribe?
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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...

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