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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
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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

Entering the nth dimension with arrays


We very briefly mentioned that an array can even hold other arrays at each position. And of course, if an array holds lots of arrays that hold lots of some other type, how do we access the values in the contained arrays? And why would we ever need this anyway? Take a look at this next example where multidimensional arrays can be useful.

A multidimensional array mini app

Let's make a really simple multidimensional array example. You can get the working project for this example in the download bundle. It is located at Chapter 13/Multidimensional Array Example/MainActivity.java.

Create a project with a blank Activity and call it Multidimensional Array Example.

After the call to setContentView in onCreate, declare and initialize a two-dimensional array like this:

// Random object for generating question numbers
Random randInt = new Random();
// a variable to hold the random value generated
int questionNumber;

// declare and allocate in separate stages for clarity...
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