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Android UI Development with Jetpack Compose

You're reading from   Android UI Development with Jetpack Compose Bring declarative and native UI to life quickly and easily on Android using Jetpack Compose and Kotlin

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Product type Paperback
Published in Nov 2023
Publisher Packt
ISBN-13 9781837634255
Length 278 pages
Edition 2nd Edition
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Author (1):
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Thomas Künneth Thomas Künneth
Author Profile Icon Thomas Künneth
Thomas Künneth
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Toc

Table of Contents (18) Chapters Close

Preface 1. Part 1: Fundamentals of Jetpack Compose
2. Chapter 1: Building Your First Compose App FREE CHAPTER 3. Chapter 2: Understanding the Declarative Paradigm 4. Chapter 3: Exploring the Key Principles of Compose 5. Part 2: Building User Interfaces
6. Chapter 4: Laying Out UI Elements in Compose 7. Chapter 5: Managing State of Your Composable Functions 8. Chapter 6: Building a Real-World App 9. Chapter 7: Exploring App Architecture 10. Part 3: Advanced Topics
11. Chapter 8: Working with Animations 12. Chapter 9: Exploring Interoperability APIs 13. Chapter 10: Testing and Debugging Compose Apps 14. Chapter 11: Developing for Different Form Factors 15. Chapter 12: Bringing Your Compose UI to Different Platforms 16. Index 17. Other Books You May Enjoy

Creating custom layouts

Sometimes, you may want to lay children out one after another in a row and start a new row when the current one has been filled. The CustomLayoutDemo sample app, as shown in the following screenshot, shows you how to do this. It creates 43 randomly colored boxes that vary in width and height:

Figure 4.4 – Sample CustomLayoutDemo app

Figure 4.4 – Sample CustomLayoutDemo app

Let’s start by looking at the composable function that creates colored boxes:

@Composable
fun ColoredBox() {
  Box(
    modifier = Modifier
      .border(
        width = 2.dp,
        color = Color.Black
      )
      .background(randomColor())
      .width((40 * randomInt123()).dp)
      .height((10 * randomInt123()).dp)
 ...
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