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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

Map clicks and custom markers

With a map showing the user’s current location by zooming in at the right location and placing a marker there, we have a rudimentary knowledge of how to render the desired map and how to obtain the required permissions and the user’s current location.

In this section, we will learn how to respond to a user interacting with the map and how to use markers more extensively. We will learn how to move markers on the map and replace the default pin marker with custom icons. When we know how to let the user place a marker anywhere on the map, we can let them choose where to deploy the secret cat agent.

We need to add a listener to the GoogleMap instance to listen for clicks on the map. Looking at our MapsActivity.kt file, the best place to do so would be in onMapReady(GoogleMap). A naïve implementation might look like this:

override fun onMapReady(googleMap: GoogleMap) {
    mMap = googleMap.apply {
  ...
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