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How to Build Android Apps with Kotlin

You're reading from   How to Build Android Apps with Kotlin A practical guide to developing, testing, and publishing your first Android apps

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Product type Paperback
Published in May 2023
Publisher Packt
ISBN-13 9781837634934
Length 704 pages
Edition 2nd Edition
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Authors (4):
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Alex Forrester Alex Forrester
Author Profile Icon Alex Forrester
Alex Forrester
Jomar Tigcal Jomar Tigcal
Author Profile Icon Jomar Tigcal
Jomar Tigcal
Eran Boudjnah Eran Boudjnah
Author Profile Icon Eran Boudjnah
Eran Boudjnah
Alexandru Dumbravan Alexandru Dumbravan
Author Profile Icon Alexandru Dumbravan
Alexandru Dumbravan
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Toc

Table of Contents (24) Chapters Close

Preface 1. Part 1: Android Foundation
2. Chapter 1: Creating Your First App FREE CHAPTER 3. Chapter 2: Building User Screen Flows 4. Chapter 3: Developing the UI with Fragments 5. Chapter 4: Building App Navigation 6. Part 2: Displaying Network Calls
7. Chapter 5: Essential Libraries: Retrofit, Moshi, and Glide 8. Chapter 6: Adding and Interacting with RecyclerView 9. Chapter 7: Android Permissions and Google Maps 10. Chapter 8: Services, WorkManager, and Notifications 11. Chapter 9: Building User Interfaces Using Jetpack Compose 12. Part 3: Testing and Code Structure
13. Chapter 10: Unit Tests and Integration Tests with JUnit, Mockito, and Espresso 14. Chapter 11: Android Architecture Components 15. Chapter 12: Persisting Data 16. Chapter 13: Dependency Injection with Dagger, Hilt, and Koin 17. Part 4: Polishing and Publishing an App
18. Chapter 14: Coroutines and Flow 19. Chapter 15: Architecture Patterns 20. Chapter 16: Animations and Transitions with CoordinatorLayout and MotionLayout 21. Chapter 17: Launching Your App on Google Play 22. Index 23. Other Books You May Enjoy

Data streams

When it comes to data observability, we have multiple approaches for implementation, whether manually built mechanisms, components from the Java language, third-party components, or finally to solutions developed particularly for Android. When it comes to Android, some of the most common solutions are LiveData, Flows from the Coroutines components, and RxJava.

The first one we will look at is LiveData, as it is part of the Android Architecture Components, which means that it is tailored specially to Android. We will then look at how we can use other types of data streams, which we will cover in more depth in future chapters.

LiveData

LiveData is a lifecycle-aware component that permits updates to your UI, but only if the UI is in an active state (for example, if the activity or fragment is in one of the STARTED or RESUMED states). To monitor changes on LiveData, you need an observer combined with a LifecycleOwner. When the activity is set to an active state, the...

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