Book Image

How to Build Android Apps with Kotlin

By : Alex Forrester, Eran Boudjnah, Alexandru Dumbravan, Jomar Tigcal
Book Image

How to Build Android Apps with Kotlin

By: Alex Forrester, Eran Boudjnah, Alexandru Dumbravan, Jomar Tigcal

Overview of this book

Are you keen to get started building Android 11 apps, but don’t know where to start? How to Build Android Apps with Kotlin is a comprehensive guide that will help kick-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 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. Moving ahead, you'll get to grips with testing, learn how to keep your architecture clean, understand how to persist data, and gain 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 (17 chapters)
12. Dependency Injection with Dagger and Koin

Starting a Background Task Using WorkManager

The first question we will address here is, Should we opt for WorkManager or a foreground service? To answer that, a good rule of thumb is to ask; do you need the action to be tracked by the user in real time? If the answer is yes (for example, if you have a task such as responding to the user's location or playing music in the background), then you should use a foreground service, with its attached notification to give the user a real-time indication of state. When the background task can be delayed or does not require user interaction (for example, downloading a large file), use WorkManager.


Starting with version 2.3.0-alpha02 of the WorkManager, you can launch a foreground service via the WorkManager by calling setForegroundAsync(ForegroundInfo). Our control over that foreground service is quite limited. It does allow you to attach a (pre-defined) notification to the work, which is why it is worth mentioning.

In our...