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Android UI Development with Jetpack Compose

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

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Product type Paperback
Published in Feb 2022
Publisher Packt
ISBN-13 9781801812160
Length 248 pages
Edition 1st 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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Table of Contents (16) 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 7. Chapter 5: Managing the State of Your Composable Functions 8. Chapter 6: Putting Pieces Together 9. Chapter 7: Tips, Tricks, and Best Practices 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: Conclusion and Next Steps 15. Other Books You May Enjoy

Keeping your composables responsive

When implementing composable functions, you should always keep in mind that their main purpose is to declare the UI and to handle user interactions. Ideally, anything needed to achieve this is passed to the composable, including state and logic (such as click handlers), making it stateless. If state is needed only inside a composable, the function may keep state temporarily using remember {}. Such composables are called stateful. If data is kept in a ViewModel, composables must interact with it. So, the ViewModel code must be fast, too.

Communicating with ViewModel instances

Data inside a ViewModel should be observable. ComposeUnitConverter uses LiveData and MutableLiveData from the Android Architecture Components to achieve this. You can choose other implementations of the Observer pattern, provided there is a way to obtain State or MutableState instances that are updated upon changes in the ViewModel. This is beyond the scope of this book...

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