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)

for loops

A for loop has a slightly more complicated syntax than the while or do while loops as it takes three parts to initialize. Have a look at the code first, then we will break it apart:

for(int i = 0; i < 10;  i++){
   //Something that needs to happen 10 times goes here
}

The slightly more complicated form of the for loop is clearer when put like this:

for(declaration and initialization; condition; change after each pass through loop).

To clarify further, we have the following:

  • declaration and initialization: We create a new int variable, i, and initialize it to 0.
  • condition: Just like the other loops, it refers to the condition that must evaluate to true for the loop to continue.
  • change after each pass through the loop: In the example, i++ means that 1 is added/incremented to i on each pass. We could also use i-- to reduce/decrement i at each pass:
    for(int i = 10; i > 0;  i--){
       // countdown...