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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

The fragment lifecycle

A fragment is a component with its own lifecycle. Understanding the fragment lifecycle is critical as it provides callbacks at certain stages of fragment creation, the running state, and destruction that configure the initialization, display, and cleanup. Fragments run in an activity, and a fragment’s lifecycle is bound to the activity’s lifecycle.

In many ways, the fragment lifecycle is very similar to the activity lifecycle, and at first glance, it appears that the former replicates the latter. There are as many callbacks that are the same or similar in the fragment lifecycle as there are in the activity lifecycle, such as onCreate(savedInstanceState: Bundle?).

The fragment lifecycle is tied to the activity lifecycle, so wherever fragments are used, the fragment callbacks are interleaved with the activity callbacks.

The same steps are gone through to initialize the fragment and prepare for it to be displayed to the user before being available...

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