What is wrong with this method definition?
doSomething(){ // Do something here }No return type is declared. You do not have to return a value from a method, but its return type must be void in this case. This is how the method should look:
void doSomething(){ // Do something here }What is wrong with this method definition?
float getBalance(){ String customerName = "Linus Torvalds"; float balance = 429.66f; return customerName; }The method returns a String (
userName) variable, but the signature states that it must return a float. With a method name likegetBalance, this code is probably what was intended:float getBalance(){ String customerName = "Linus Torvalds"; float balance = 429.66f; return balance; }When do we call the
onCreatemethod? !Trick question alert!We don't. Android decides when to call
onCreateas well as all the other methods that make up the lifecycle of an Activity. We just override the ones that are useful to us. We do, however, callsuper.onCreateso...
Android Programming for Beginners
By :
Android Programming for Beginners
By:
Overview of this book
Android is the most popular OS in the world. There are millions of devices accessing tens of thousands of applications. It is many people's entry point into the world of technology; it is an operating system for everyone. Despite this, the entry-fee to actually make Android applications is usually a computer science degree, or five years’ worth of Java experience.
Android Programming for Beginners will be your companion to create Android applications from scratch—whether you’re looking to start your programming career, make an application for work, be reintroduced to mobile development, or are just looking to program for fun. We will introduce you to all the fundamental concepts of programming in an Android context, from the Java basics to working with the Android API. All examples are created from within Android Studio, the official Android development environment that helps supercharge your application development process.
After this crash-course, we’ll dive deeper into Android programming and you’ll learn how to create applications with a professional-standard UI through fragments, make location-aware apps with Google Maps integration, and store your user’s data with SQLite. In addition, you’ll see how to make your apps multilingual, capture images from a device’s camera, and work with graphics, sound, and animations too.
By the end of this book, you’ll be ready to start building your own custom applications in Android and Java.
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Current Title:
Android Programming for Beginners
Table of Contents (37 chapters)
Android Programming for Beginners
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Free Chapter
The First App
Java – First Contact
Exploring Android Studio
Designing Layouts
Real-World Layouts
The Life and Times of an Android App
Coding in Java Part 1 – Variables, Decisions, and Loops
Coding in Java Part 2 – Methods
Object-Oriented Programming
Everything's a Class
Widget Mania
Having a Dialogue with the User
Handling and Displaying Arrays of Data
Handling and Displaying Notes in Note To Self
Android Intent and Persistence
UI Animations
Sound FX and Supporting Different Versions of Android
Design Patterns, Fragments, and the Real World
Using Multiple Fragments
Paging and Swiping
Navigation Drawer and Where It's Snap
Capturing Images
Using SQLite Databases in Our Apps
Adding a Database to Where It's Snap
Integrating Google Maps and GPS Locations
Upgrading SQLite – Adding Locations and Maps
Going Local – Hola!
Threads, Touches, Drawing, and a Simple Game
Publishing Apps
Before You Go
Index
Customer Reviews