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Welcome to part 4 of my Android Development Tutorial. In the last part, I showed you how to put together an Android User Interface. This time I will add to that app in a big way!

Over the course of this tutorial and the next I will cover RadioButtons, RadioGroups, CheckBoxes, DropDows (Spinners), Buttons, Chronometers, ChangeListeners, ItemSelectedListeners, onClickListeners and much more.