This is a full-day tutorial in writing Android apps using the Android Studio IDE on Macintosh, PC, or Linux. An app is composed of objects written in Java, and a screen layout in the Extensible Markup Language. See how the Java code manipulates the XML to present a user interface containing buttons, sliders, and other controls. Draw text and graphics on the screen, respond to a touch or keystroke, recognize a swipe or a pinch, and perform simple animations.

We concentrate on three Android design patterns involving views, which are visible areas on the screen.
(1) A listener is an object whose methods are called in response to a stimulus. We plug the listener into a view to make the view touch-sensitive.
(2) A cursor is a source of data, possibly from the Contacts or other database. We plug the cursor into an adapter, which encases each item of data in a separate view.
(3) An adapter view displays a series of views on the screen, often in the form of a table or list. We plug an adapter into the adapter view to provide the views to be displayed. As our finale, a component of one app will launch and communicate with a component of another app on the same device.