1 page.title=Best Practices for User Interface 2 page.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 9 devices. Android provides a flexible framework for UI design that allows your app to display 10 different layouts for different devices, create custom UI widgets, and even control aspects 11 of the system UI outside your app's window.</p> 12