Android Docs wrote:As you design your UI for different screen sizes, you'll discover that each design requires a minimum amount of space.
So, each generalized screen size above has an associated minimum resolution that's defined by the system.
These minimum sizes are in "dp" units—the same units you should use when defining your layouts—which allows the system to avoid worrying about changes in screen density.
- xlarge screens are at least 960dp x 720dp
- large screens are at least 640dp x 480dp
- normal screens are at least 470dp x 320dp
- small screens are at least 426dp x 320dp