3.3. Technologies Overview

This section introduces the IDE features and Android technologies you’ll use to build the Tip Calculator app. We assume that you’re already familiar with Java object-oriented programming—if you’re not, the appendices contain an introduction to Java. You’ll:

• use various Android classes to create objects

• call methods on Android classes and objects

• define and call your own methods

• use inheritance to create a subclass of Android’s Activity class that defines the Tip Calculator’s functionality

• use event handling, anonymous inner classes and interfaces to process the user’s GUI interactions