Book Image

Android Programming for Beginners - Second Edition

By : John Horton
Book Image

Android Programming for Beginners - Second Edition

By: John Horton

Overview of this book

Are you trying to start a career in programming, but haven't found the right way in? Do you have a great idea for an app, but don't know how to make it a reality? Or maybe you're just frustrated that in order to learn Android, you must know Java. If so, then this book is for you. This new and expanded second edition of Android Programming for Beginners will be your companion to create Android Pie applications from scratch. We will introduce you to all the fundamental concepts of programming in an Android context, from the basics of Java to working with the Android API. All examples use the up-to-date API classes, and 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 and store your user's data with SQLite. In addition, you'll see how to make your apps multilingual, draw to the screen with a finger, 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.
Table of Contents (35 chapters)
Android Programming for Beginners - Second Edition
Contributors
Preface
Other Books You May Enjoy
Index

Using the apple


The Apple class is done, and we can now put it to work.

Add the code to initialize the Apple object (mApple) in the constructor at the end as shown:

// Call the constructors of our two game objects
mApple = new Apple(context,
         new Point(NUM_BLOCKS_WIDE,
                      mNumBlocksHigh),
                      blockSize);

Notice that we pass in all the data required by the Apple constructor so it can set itself up.

We can now spawn an apple as shown next in the newGame method by calling the spawn method that we added when we coded the Apple class previously. Add the highlighted code to the newGame method:

// Called to start a new game
public void newGame() {

   // reset the snake


   // Get the apple ready for dinner
   mApple.spawn();

   // Reset the mScore
   mScore = 0;

   // Setup mNextFrameTime so an update can triggered
   mNextFrameTime = System.currentTimeMillis();
}

Next, we can draw the apple by calling its draw method from the draw method of SnakeGame...