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)

Chapter 20: Drawing Graphics

This entire chapter will be about the Android Canvas class and some related classes, including Paint, Color, and Bitmap. These classes combined bring great power when it comes to drawing to the screen. Sometimes the default UI provided by the Android API isn't what we need. If we want to make a drawing app, draw graphs, or perhaps create a game, we need to take control of every pixel that the Android device has to offer.

In this chapter, we will cover the following:

  • Understanding Canvas and related classes
  • Writing a Canvas-based demo app
  • Looking at the Android coordinate system so we know where to do our drawing
  • Learning about drawing and manipulating bitmaps
  • Writing a bitmap-based demo app

Let's draw!