Android devices come in many different shapes and sizes. Your task, as a developer, is to create a UI that looks just as good on the small space available to a budget-friendly smartphone, as it does on the large space available to a top-of-the-line Android tablet and everything in between.
So let's break it down. Android categorizes screens in two ways:
xlarge. However, Android 3.2 (API level 13) introduced some new configuration qualifiers that allow you to be more specific about screen sizes.