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You generally design your UI in the designer this creates XML files that you can also modify as needed.Fragment - a Fragment is a Java controller that typically corresponds to a widget in a screen (or possibly the full screen).Activity - an Activity is a Java controller class that typically corresponds to one screen in your app.You also need to declare all of your activities here. AndroidManifest.xml - describe your app in this file your app starts with the “main” method you declare here.Some of the main Android concepts to grasp are: If you want to create Android games, The Beginner’s Guide to Android Game Development is a good starter book.
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