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Kickstart Modern Android Development with Jetpack and Kotlin

Kickstart Modern Android Development with Jetpack and Kotlin

By : Ghita
4.9 (10)
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Kickstart Modern Android Development with Jetpack and Kotlin

Kickstart Modern Android Development with Jetpack and Kotlin

4.9 (10)
By: Ghita

Overview of this book

With Jetpack libraries, you can build and design high-quality, robust Android apps that have an improved architecture and work consistently across different versions and devices. This book will help you understand how Jetpack allows developers to follow best practices and architectural patterns when building Android apps while also eliminating boilerplate code. Developers working with Android and Kotlin will be able to put their knowledge to work with this condensed practical guide to building apps with the most popular Jetpack libraries, including Jetpack Compose, ViewModel, Hilt, Room, Paging, Lifecycle, and Navigation. You'll get to grips with relevant libraries and architectural patterns, including popular libraries in the Android ecosystem such as Retrofit, Coroutines, and Flow while building modern applications with real-world data. By the end of this Android app development book, you'll have learned how to leverage Jetpack libraries and your knowledge of architectural concepts for building, designing, and testing robust Android applications for various use cases.
Table of Contents (17 chapters)
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1
Part 1: Exploring the Core Jetpack Suite and Other Libraries
7
Part 2: A Guide to Clean Application Architecture with Jetpack Libraries
13
Part 3: Diving into Other Jetpack Libraries

Making our countdown component aware of the lifecycle of composables

The main issue is that our CustomCountdown component still runs its countdown even after the CountdownItem() composable leaves composition. We want to pause the timer when its corresponding composable is not visible anymore. With such an approach, we can prevent users from cheating, and we can award the prize only to users that have had the countdown timer visible for the full amount of time. Basically, if the timer is not visible anymore, the countdown should stop.

To pause the timer when its corresponding composable function leaves composition, we must somehow call the stop() function exposed by CustomCountdown. But when should we do that?

If you look inside the body of the CountdownItem() composable, you will notice that we have already registered a DisposableEffect() composable that notifies us when the CountdownItem() composable leaves composition by exposing the onDispose() callback:

@Composable
private...
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