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

Moving from components to composable functions

So far, I explained the word component by saying that it refers to UI elements. In fact, the term is used in quite a few other areas. Generally speaking, components structure systems by separating distinct portions or parts of them. The inner workings of a component are typically hidden from the outside (known as the black box principle).


To learn more about the black box principle, please refer to

Components communicate with other parts of the system by sending and receiving messages. The appearance or behavior of a component is controlled through a set of attributes, or properties.

Consider TextView. We set text by modifying the text property and we control its visibility through visibility. What about sending and receiving messages? Let's look at Button. We can react to clicks (receive a message) by registering (sending a message) an OnClickListener instance. The same principle...