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Android Programming for Beginners

You're reading from   Android Programming for Beginners Learn all the Java and Android skills you need to start making powerful mobile applications

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Product type Paperback
Published in Dec 2015
Publisher Packt
ISBN-13 9781785883262
Length 698 pages
Edition 1st Edition
Languages
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Authors (2):
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Paresh Mayani Paresh Mayani
Author Profile Icon Paresh Mayani
Paresh Mayani
John Horton John Horton
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John Horton
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Toc

Table of Contents (32) Chapters Close

Preface 1. The First App FREE CHAPTER 2. Java – First Contact 3. Exploring Android Studio 4. Designing Layouts 5. Real-World Layouts 6. The Life and Times of an Android App 7. Coding in Java Part 1 – Variables, Decisions, and Loops 8. Coding in Java Part 2 – Methods 9. Object-Oriented Programming 10. Everything's a Class 11. Widget Mania 12. Having a Dialogue with the User 13. Handling and Displaying Arrays of Data 14. Handling and Displaying Notes in Note To Self 15. Android Intent and Persistence 16. UI Animations 17. Sound FX and Supporting Different Versions of Android 18. Design Patterns, Fragments, and the Real World 19. Using Multiple Fragments 20. Paging and Swiping 21. Navigation Drawer and Where It's Snap 22. Capturing Images 23. Using SQLite Databases in Our Apps 24. Adding a Database to Where It's Snap 25. Integrating Google Maps and GPS Locations 26. Upgrading SQLite – Adding Locations and Maps 27. Going Local – Hola! 28. Threads, Touches, Drawing, and a Simple Game 29. Publishing Apps 30. Before You Go Index

Handling touches

In our Pong game, we will have no UI buttons, and therefore cannot use the OnCLickListener interface and override the onClick method. This is not a problem, however. We will just use another interface to suit our situation. We will use OnTouchListener and override the onTouchEvent method. It works a little bit differently, so let's take a look before we dive into the game code.

We must implement the OnTouchListener interface for the activity we want to listen for touches in, like this:

public class MainActivity extends Activity implements View.OnTouchListener{

Then, we can override the onTouchEvent method, perhaps a bit like this:

@Override
public boolean onTouchEvent(MotionEvent motionEvent) {
  
  float x = motionEvent.getX();
  float y = motionEvent.getY();

  //do something with the x and y values

  return false;
}

The variable x will hold the horizontal value of the position on the screen that was touched, and y will hold the vertical position. It is worth noting...

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