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Android UI Development with Jetpack Compose
Android UI Development with Jetpack Compose

Android UI Development with Jetpack Compose: Bring declarative and native UIs to life quickly and easily on Android using Jetpack Compose

By Thomas Künneth
$39.99 $9.99
Book Feb 2022 248 pages 1st Edition
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Product Details


Publication date : Feb 21, 2022
Length 248 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781801812160
Vendor :
Google
Category :
Concepts :
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Android UI Development with Jetpack Compose

Chapter 1: Building Your First Compose App

When Android was introduced more than 10 years ago, it quickly gained popularity among developers because it was incredibly easy to write apps. All you had to do was define the user interface (UI) in an XML file and connect it to your activity. This worked flawlessly because apps were small and developers needed to support just a handful of devices.

So much has changed since then.

With every new platform version, Android gained new features. Through the years, device manufacturers introduced thousands of devices with different screen sizes, pixel densities, and form factors. While Google did its best to keep the Android view system comprehendible, the complexity of apps increased significantly; basic tasks such as implementing scrolling lists or animations require lots of boilerplate code.

It turned out that these problems were not specific to Android. Other platforms and operating systems faced them as well. Most issues stem from how UI toolkits used to work; they follow a so-called imperative approach (which I will explain in Chapter 2, Understanding the Declarative Paradigm). The solution was a paradigm shift. The web framework React was the first to popularize a declarative approach. Other platforms and frameworks (for example, Flutter and SwiftUI) followed.

Jetpack Compose is Google's declarative UI framework for Android. It dramatically simplifies the creation of UIs. As you will surely agree after reading this book, using Jetpack Compose is both easy and fun. But before we dive in, please note that Jetpack Compose is Kotlin-only. This means that all your Compose code will have to be written in Kotlin. To follow this book, you should have a basic understanding of the Kotlin syntax and the functional programming model. If you want to learn more about these topics, please refer to the Further reading section at the end of this chapter.

This chapter covers three main topics:

  • Saying hello to composable functions
  • Using the preview
  • Running a Compose app

I will explain how to build a simple UI with Jetpack Compose. Next, you will learn to use the preview feature in Android Studio and how to run a Compose app. By the end of this chapter, you will have a basic understanding of how composable functions work, how they are integrated into your app, and how your project must be configured in order to use Jetpack Compose.

Technical requirements

All the code files for this chapter can be found on GitHub at https://github.com/PacktPublishing/Android-UI-Development-with-Jetpack-Compose/tree/main/chapter_01. Please download the zipped version or clone the repository to an arbitrary location on your computer. The projects require at least Android Studio Arctic Fox. You can download the latest version at https://developer.android.com/studio. Please follow the detailed installation instructions at https://developer.android.com/studio/install.

To open this book's project, launch Android Studio, click the Open button in the upper-right area of the Welcome to Android Studio window, and select the base directory of the project in the folder selection dialog. Please make sure to not open the base directory of the repository, because Android Studio would not recognize the projects. Instead, you must pick the directory that contains the project you want to work with.

To run a sample app, you need a real device or the Android Emulator. Please make sure that developer options and USB debugging are enabled on the real device, and that the device is connected to your development machine via USB or WLAN. Please follow the instructions at https://developer.android.com/studio/debug/dev-options. You can also set up the Android Emulator. You can find detailed instructions at https://developer.android.com/studio/run/emulator.

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Key benefits

  • Understand the difference between the imperative (Android View) and declarative (Jetpack Compose) approach
  • Learn about the structure of a Compose app, built-in Compose UI elements, and core concepts such as state hoisting and composition over inheritance
  • Write, test, and debug composable functions

Description

Jetpack Compose is Android’s new framework for building fast, beautiful, and reliable native user interfaces. It simplifies and significantly accelerates UI development on Android using the declarative approach. This book will help developers to get hands-on with Jetpack Compose and adopt a modern way of building Android applications. The book is not an introduction to Android development, but it will build on your knowledge of how Android apps are developed. Complete with hands-on examples, this easy-to-follow guide will get you up to speed with the fundamentals of Jetpack Compose such as state hoisting, unidirectional data flow, and composition over inheritance and help you build your own Android apps using Compose. You'll also cover concepts such as testing, animation, and interoperability with the existing Android UI toolkit. By the end of the book, you'll be able to write your own Android apps using Jetpack Compose.

What you will learn

Gain a solid understanding of the core concepts of Jetpack Compose Develop beautiful, neat, and immersive UI elements that are user friendly, reliable, and performant Build a complete app using Jetpack Compose Add Jetpack Compose to your existing Android applications Test and debug apps that use Jetpack Compose Find out how Jetpack Compose can be used on other platforms

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Buy Now

Product Details


Publication date : Feb 21, 2022
Length 248 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781801812160
Vendor :
Google
Category :
Concepts :

Table of Contents

16 Chapters
Preface Chevron down icon Chevron up icon
1. Part 1:Fundamentals of Jetpack Compose Chevron down icon Chevron up icon
2. Chapter 1: Building Your First Compose App Chevron down icon Chevron up icon
3. Chapter 2: Understanding the Declarative Paradigm Chevron down icon Chevron up icon
4. Chapter 3: Exploring the Key Principles of Compose Chevron down icon Chevron up icon
5. Part 2:Building User Interfaces Chevron down icon Chevron up icon
6. Chapter 4: Laying Out UI Elements Chevron down icon Chevron up icon
7. Chapter 5: Managing the State of Your Composable Functions Chevron down icon Chevron up icon
8. Chapter 6: Putting Pieces Together Chevron down icon Chevron up icon
9. Chapter 7: Tips, Tricks, and Best Practices Chevron down icon Chevron up icon
10. Part 3:Advanced Topics Chevron down icon Chevron up icon
11. Chapter 8: Working with Animations Chevron down icon Chevron up icon
12. Chapter 9: Exploring Interoperability APIs Chevron down icon Chevron up icon
13. Chapter 10: Testing and Debugging Compose Apps Chevron down icon Chevron up icon
14. Chapter 11: Conclusion and Next Steps Chevron down icon Chevron up icon
15. Other Books You May Enjoy Chevron down icon Chevron up icon

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