1page.title=Best Practices for User Interface 2page.trainingcourse=true 3 4@jd:body 5 6 7 8<p>These classes teach you how to build a user interface using Android layouts for all types of 9devices. Android provides a flexible framework for UI design that allows your app to display 10different layouts for different devices, create custom UI widgets, and even control aspects 11of the system UI outside your app's window.</p> 12