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

Adding navigation

Scaffold() allows you to put content in a slot at the bottom of the screen using its bottomBar parameter. This can, for example, be a BottomAppBar(). Material Design bottom app bars provide access to a bottom navigation drawer and up to four actions, including a floating action button. ComposeUnitConverter adds BottomNavigation() instead. Material Design bottom navigation bars allow movement between primary destinations in an app.

Defining screens

Conceptually, primary destinations are screens, something that, before Jetpack Compose, may have been displayed in separate activities. Here's how screens are defined in ComposeUnitConverter:

sealed class ComposeUnitConverterScreen(
  val route: String,
  @StringRes val label: Int,
  @DrawableRes val icon: Int
) {
  companion object {
    val screens = listOf(