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Android Programming for Beginners

You're reading from   Android Programming for Beginners Build in-depth, full-featured Android 9 Pie apps starting from zero programming experience

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Product type Paperback
Published in Oct 2018
Publisher Packt
ISBN-13 9781789538502
Length 766 pages
Edition 2nd Edition
Languages
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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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Toc

Table of Contents (33) Chapters Close

Preface 1. Beginning Android and Java FREE CHAPTER 2. First Contact – Java, 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. Java Variables, Operators, and Expressions 8. Java Decisions and Loops 9. Java Methods 10. Object-Oriented programming 11. More Object-Oriented Programming 12. The Stack, the Heap, and the Garbage Collector 13. Anonymous Classes – Bringing Android Widgets to Life 14. Android Dialog Windows 15. Arrays, ArrayList, Map and 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. Supporting Different Versions of 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. Coding a Snake Game Using Everything We Have Learned So Far 29. Enumerations and Finishing the Snake Game 30. A Quick Chat Before You Go Other Books You May Enjoy Index

Method structure


The first part of a method that we write is called the signature. Here is a hypothetical method signature:

public boolean addContact(boolean isFriend, string name)

If we add an opening and closing pair of curly braces {} with some code that the method performs, then we have a complete method – a definition. Here is another made-up, yet syntactically correct, method:

private void setCoordinates(int x, int y){
   // code to set coordinates goes here
}

As we have seen, we could then use our new method from another part of our code, like this:

// I like it here

setCoordinates(4,6);// now I am going off to setCoordinates method

// Phew, I'm back again - code continues here

At the point where we call setCoordinates, our program's execution would branch to the code contained within that method. The method would execute all the statements inside it, step by step, until it reaches the end and returns control to the code that called it – or sooner if it hits a return statement. Then...

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