Book Image

Android UI Development with Jetpack Compose

By : Thomas Künneth
Book Image

Android UI Development with Jetpack Compose

By: Thomas Künneth

Overview of this book

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.
Table of Contents (16 chapters)
Part 1:Fundamentals of Jetpack Compose
Part 2:Building User Interfaces
Part 3:Advanced Topics

Showing and hiding UI elements with animations

Often, your UI will contain information that need not be visible all the time. For example, in an address book you may want to show only key attributes of a contact, and present detailed information upon request, typically after a button click. However, just showing and hiding the additional data feels sudden and abrupt. Using animations leads to a more pleasant experience, so let's look into this more.

Understanding AnimatedVisibility()

In this section, we will look at my sample composable AnimatedVisibilityDemo(). It belongs to the AnimationDemo project. Like StateDemo(), SingleValueAnimationDemo(), and MultipleValuesAnimationDemo(), it uses a Column() instance, which contains a Button() instance and a Box() instance. This part of the code is simple and straightforward, so there is no need to repeat it in print. The button toggles a state, which starts the animation. Let's see how this works: