Book Image

Android UI Development with Jetpack Compose - Second Edition

By : Thomas Künneth
5 (1)
Book Image

Android UI Development with Jetpack Compose - Second Edition

5 (1)
By: Thomas Künneth

Overview of this book

Compose has caused a paradigm shift in Android development, introducing a variety of new concepts that are essential to an Android developer’s learning journey. It solves a lot of pain points associated with Android development and is touted to become the default way to building Android apps over the next few years. This second edition has been thoroughly updated to reflect all changes and additions that were made by Google since the initial stable release, and all examples are based on Material 3 (also called Material You). This book uses practical examples to help you understand the fundamental concepts of Jetpack Compose and how to use them when you are building your own Android applications. You’ll begin by getting an in-depth explanation of the declarative approach, along with its differences from and advantages over traditional user interface (UI) frameworks. Having laid this foundation, the next set of chapters take a practical approach to show you how to write your first composable function. The chapters will also help you master layouts, an important core component of every UI framework, and then move to more advanced topics such as animation, testing, and architectural best practices. By the end of this book, you’ll be able to write your own Android apps using Jetpack Compose and Material Design.
Table of Contents (18 chapters)
Part 1: Fundamentals of Jetpack Compose
Part 2: Building User Interfaces
Part 3: Advanced Topics

Integrating toolbars and menus

Early Android versions did not know about action or app bars. They were introduced with API level 11 (Honeycomb). The options menu, on the other hand, has been around since the beginning, but it was opened by pressing a dedicated hardware button and shown at the bottom of the screen. For Android 3, it moved to the top and became a vertical list. Some elements could be made available permanently as actions. In a way, the options menu and the action bar merged. While all the aspects of the action bar were originally handled by the hosting activity, the AppCompat support library introduced an alternative implementation (getSupportActionBar()).

Using Scaffold() to structure your screen

Jetpack Compose includes several app bar implementations that follow Material You specifications. They can be added to a Compose UI through Scaffold(), a composable function that acts as an app frame or skeleton. The following code snippet is the root of the ComposeUnitConverter...