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Android Programming for Beginners

Android Programming for Beginners

By : John Horton, Mayani
4.1 (47)
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Android Programming for Beginners

Android Programming for Beginners

4.1 (47)
By: John Horton, Mayani

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.
Table of Contents (32 chapters)
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31
Index

Android Canvas demo app

Let's make an app that uses the Canvas and Paint classes and do a bit of drawing. This example will be completely static (no animation), so we can clearly see how to use Canvas and Paint without cluttering up the code with things we will learn later.

In this demo app, we use some conceptually helpful variable names to help us grasp the role that each object is playing. But we will go through the whole thing at the end to make sure we know exactly what is going on at each stage. Of course, you don't have to type all this in; you can open the completed code files from the Canvas Demo folder in the Chapter 28 folder of the download bundle.

Start a new project and call it Canvas Demo. Open the layout_main.xml file, and edit it to have a single ImageView with an ID of imageView, as in this code:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width...

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