Book Image

Android Programming for Beginners - Third Edition

By : John Horton
Book Image

Android Programming for Beginners - Third Edition

By: John Horton

Overview of this book

Do you want to make a career in programming but don’t know where to start? Do you have a great idea for an app but don't know how to make it a reality? Or are you worried that you’ll have to learn Java programming to become an Android developer? Look no further! This new and expanded third edition of Android Programming for Beginners will be your guide to creating Android applications from scratch. The book starts by introducing you to all the fundamental concepts of programming in an Android context, from the basics of Java to working with the Android API. You’ll learn with the help of examples that use up-to-date API classes and are created within Android Studio, the official Android development environment that helps supercharge your mobile application development process. After a crash course on the key programming concepts, you’ll explore Android programming and get to grips with creating applications with a professional-standard UI using fragments and storing user data with SQLite. This Android Java book also shows you how you can make your apps multilingual, draw on the screen with a finger, and work with graphics, sound, and animations. By the end of this Android programming book, you'll be ready to start building your own custom applications in Android and Java.
Table of Contents (30 chapters)

Bitmap manipulation demo app

Now that we have studied the theory, let's draw and spin some bitmaps. Create a new project using the Empty Activity template and call it Manipulating Bitmaps.

Adding the graphic to the project

Right-click and select Copy to copy the bob.png graphics file from the download bundle in the Chapter 20/Manipulating Bitmaps/drawable folder.

In Android Studio, locate the app/res/drawable folder in the project explorer window. This next screenshot makes clear where this folder can be located and what it will look like with the bob.png image in it:

Figure 20.6 – app/res/drawable folder with bob.png

Right-click on the drawable folder and select Paste to add the bob.png file to the project. Click OK twice to confirm the default options for importing the file into the project.

Edit the code of the MainActivity class to include all the required import directives, the basic version of the Activity class, and a selection...