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Simplifying Android Development with Coroutines and Flows

Simplifying Android Development with Coroutines and Flows

By : Jomar Tigcal
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Simplifying Android Development with Coroutines and Flows

Simplifying Android Development with Coroutines and Flows

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

In the previous chapter, we focused on understanding Kotlin Flow cancellation, learning how to make Flows cancellable, and handling the cancellation. We also learned about retrying tasks with Flows and handling completion and exceptions in your Flows.

Adding tests for the Kotlin Flows in your code is an important part of app development. Tests will ensure that the Flows we add to our projects are free of bugs or errors and that they will work as we intended. They can make developing apps easier and help you refactor and maintain your code confidently.

In this chapter, we will learn how to test Kotlin Flows in Android. First, we will understand how to set up your Android project for testing Flows. We will then proceed with creating and running tests for Kotlin Flows.

This chapter covers the following main topics:

  • Setting up an Android project for testing Flows
  • Testing Kotlin Flows
  • Testing Flows with Turbine

By the end...

End of Section 1
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