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Simplifying Android Development with Coroutines and Flows

By : Tigcal

5 (2)

Simplifying Android Development with Coroutines and Flows

5 (2)

By: 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.

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

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Part 1 – Kotlin Coroutines on Android

Part 1 – Kotlin Coroutines on Android

Free Chapter

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

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

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

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

Part 2 – Kotlin Flows on Android

Part 2 – Kotlin Flows on Android

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

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

Chapter 7: Testing Kotlin Flows

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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Exercise – using coroutines in an Android app

In this exercise, you will be working with an application that displays movies that are playing now in cinemas. You will be using The Movie Database API version 3 to get the list of movies. Go to https://developers.themoviedb.org/3 and register for an API key. Once you’ve done that, follow these steps:

Open the Movie App project in the Chapter02 directory in this book’s code repository.
Open MovieRepository and update apiKey with the value from The Movie Database API:
```
private val apiKey = "your_api_key_here" 
```

Open the app/build.gradle file and add a dependency for kotlinx-coroutines-android:

implementation ‘org.jetbrains.kotlinx:kotlinx-
  coroutines-android:1.6.0’

This will add the kotlinx-coroutines-core and kotlinx-coroutines-android libraries to your project, allowing you to use coroutines in your code.

Also, add the dependencies for the ViewModel extension...

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