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
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