AndroidManifest.xml file that Android generated for your first project gets the job done. However, for a production application, you may wish to consider adding a few attributes and elements, such as those described in this chapter.
Android devices come with a wide range of screen sizes, from 2.8-inch tiny smartphones to 46-inch Google TVs. Android divides these into four categories, based on physical screen size and the distance at which they are usually viewed:
Small (under 3 inches)
Normal (3 inches to around 4.5 inches)
Large (4.5 inches to around 10 inches)
Extra-large (over 10 inches)
By default, your application will not support small screens, will support normal screens, ...