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Android Programming with Kotlin for Beginners

You're reading from   Android Programming with Kotlin for Beginners Build Android apps starting from zero programming experience with the new Kotlin programming language

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Product type Paperback
Published in Apr 2019
Publisher Packt
ISBN-13 9781789615401
Length 698 pages
Edition 1st Edition
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Author (1):
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John Horton John Horton
Author Profile Icon John Horton
John Horton
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Table of Contents (31) Chapters Close

Preface 1. Getting Started with Android and Kotlin FREE CHAPTER 2. Kotlin, XML, and the UI Designer 3. Exploring Android Studio and the Project Structure 4. Getting Started with Layouts and Material Design 5. Beautiful Layouts with CardView and ScrollView 6. The Android Lifecycle 7. Kotlin Variables, Operators, and Expressions 8. Kotlin Decisions and Loops 9. Kotlin Functions 10. Object-Oriented Programming 11. Inheritance in Kotlin 12. Connecting Our Kotlin to the UI and Nullability 13. Bringing Android Widgets to Life 14. Android Dialog Windows 15. Handling Data and Generating Random Numbers 16. Adapters and Recyclers 17. Data Persistence and Sharing 18. Localization 19. Animations and Interpolations 20. Drawing Graphics 21. Threads and Starting the Live Drawing App 22. Particle Systems and Handling Screen Touches 23. Android Sound Effects and the Spinner Widget 24. Design Patterns, Multiple Layouts, and Fragments 25. Advanced UI with Paging and Swiping 26. Advanced UI with Navigation Drawer and Fragment 27. Android Databases 28. A Quick Chat Before You Go A. Other Book You May Enjoy Index

The game loop

So, what is a game loop anyway? Almost every live drawing, graphics-based app, and game has a game loop. Even games that you might not expect, such as turn-based games, still need to synchronize player input with drawing and AI, while following the rules of the underlying OS.

There is a constant need to update the objects in the app, such as by moving them and drawing everything in its current position while simultaneously responding to user input:

The game loop

Our game loop comprises three main phases:

  1. Update all game and drawing objects by moving them, detecting collisions, and processing the AI, such as particle movements and state changes
  2. Based on the data that has just been updated, draw the frame of animation in its latest state
  3. Respond to screen touches from the user

We already have a draw function for handling this part of the loop. This suggests that we will have a function to do all the updating as well. We will soon code the outline of an update function. In addition, we know that...

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