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

Chapter 4: Laying Out UI Elements

In the previous chapters, you learned how to build simple UIs. Although they consisted of just a few UI elements, they needed to arrange their buttons, text fields, and sliders in a particular order, direction, or hierarchy. Layouts position and size their content in a way specific to this layout, such as horizontally (Row()) or vertically (Column()). This chapter explores layouts in greater detail.

In this chapter, we will cover the following topics:

  • Using predefined layouts
  • Understanding the single measure pass
  • Creating custom layouts

We will start by exploring the predefined layouts of Row(), Column(), and Box(). You will learn how to combine them to create beautiful UIs. Next, I'll introduce you to ConstraintLayout. It places composables that are relative to others on the screen and uses attributes to flatten the UI element hierarchy. This is an alternative to nesting Row(), Column(), and Box().

The second main...