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How to Build Android Apps with Kotlin - Second Edition

You're reading from  How to Build Android Apps with Kotlin - Second Edition

Product type Book
Published in May 2023
Publisher Packt
ISBN-13 9781837634934
Pages 704 pages
Edition 2nd Edition
Languages
Authors (4):
Alex Forrester Alex Forrester
Profile icon Alex Forrester
Eran Boudjnah Eran Boudjnah
Profile icon Eran Boudjnah
Alexandru Dumbravan Alexandru Dumbravan
Profile icon Alexandru Dumbravan
Jomar Tigcal Jomar Tigcal
Profile icon Jomar Tigcal
View More author details

Table of Contents (24) Chapters

Preface 1. Part 1: Android Foundation
2. Chapter 1: Creating Your First App 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

Loading images from a remote URL

We just learned how to extract data from an API response. That data often includes URLs to images we want to present to the user. There is quite a bit of work involved in achieving that. First, you must fetch the image as a binary stream from the URL. Then, you need to transform that binary stream into an image (it could be a GIF, JPEG, or one of a few other image formats).

Then, you need to convert it into a bitmap instance, potentially resizing it to use less memory. You may also want to apply other transformations to it at that point. Then, you need to set it to ImageView.

Sounds like a lot of work, doesn’t it? Well, luckily for us, there are a few libraries that do all of that (and more) for us. The most commonly used libraries are Square’s Picasso (see https://square.github.io/picasso/) and Glide by Bump Technologies (see https://github.com/bumptech/glide). Facebook’s Fresco (see https://frescolib.org/) is somewhat less...

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