- Android Programming for Beginners
- Table of Contents
- Android Programming for Beginners
- Credits
- About the Author
- About the Reviewers
- www.PacktPub.com
- Preface
- 1. The First App
- 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
- Important memory management warning
- Introducing OOP
- Taking a look at the code for a class
- The basic classes mini app
- Remember that encapsulation thing?
- Encapsulation and static methods mini app
- OOP and inheritance
- The inheritance mini app
- Polymorphism
- FAQ
- Summary
- 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
- Introducing the model-view-controller pattern
- The imperfections of Note To Self revisited
- Android design guidelines
- Real-world apps
- The device detection mini app
- Configuration qualifiers
- Using configuration qualifiers – mini app
- Fragments
- Our first working Fragment mini app
- Fragment reality check
- FAQ
- Summary
- 19. Using Multiple Fragments
- Using singletons for the model layer
- Inter-Fragment communications – interfaces revisited
- The dual-Fragment address book mini app
- Getting started
- Alias resources
- The NameAndAddress class
- Creating the communication interface
- Explaining the structure of the onListItemSelected method
- Explaining the code that starts a new Activity
- Explaining the code when the detail Fragment is already present
- What do we need to do?
- Creating the AddressDetailFragment class and layout
- Coding PortraitDetailActivity and the layout
- FAQ
- Summary
- 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
In this chapter we will discover that in Java, classes are fundamental to just about everything. We will begin to understand why the software engineers at Sun Microsystems back in the early 1990's made Java the way they did.
We have already talked about reusing other people's code, specifically the Android API, but in this chapter, we will really get to grips with how this works and learn about object-oriented programming (OOP) and how to use it.
In short, we will cover the following topics:
- What OOP is including encapsulation, inheritance, and polymorphism
- Writing and using our first, very own class
- Encapsulation in depth and how it helps us
- Inheritance in depth and how to take full advantage of it
- Polymorphism explained in greater detail
- Static classes and how we have been using them already
- Abstract classes and interfaces
Before we get into exactly what OOP is, a quick warning.
I'm referring to our memories for a change. If you try to memorize this chapter, you will have to make a lot of room in your brain and you will probably forget something really important in its place, like going to work or thanking the author for telling you not to try and memorize this stuff.
A good goal would be to try and just about get it. This way, your understanding will become more rounded. You can then refer back to this chapter for a refresher when needed.
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