There are 16 Android devices with screen cutouts from 11 manufacturers, according to Google. Additionally, Google also highlights that in order for cutouts to not intrude or negatively affect apps, two requirements are needed.
Even though some Android Oreo devices have cutouts already, Android P is the first time Google's officially supported the feature.
Apparently, some Android phone designers designers were thinking that if one is good, two is better, and three or more is best of all.
Phone designers were apparently going overboard if Google had prevent them from putting in three or more. Similar to all the existing smartphones with notches, Android P will also require developers to use the space around the cutout for displaying status bar information only in normal mode - the status bar should be as broad as the notch.
In one of the latest posts on the Android Developer Blog, Google has outlined all the methods to implement the notch for various apps. Google states that "the app's window is allowed to extend into the cutout area if the cutout is fully contained within a system bar".
As for where Google says these notches can be located, so long as there aren't multiple cutouts on a single edge (top or bottom sides) or cutouts on the left or right long edge of phones, it's all fair game for manufacturers.
For developers, this means all app windows "will be letterboxed so that none of your content is displayed in the cutout area", regardless of whether they're in landscape or full-screen mode. While we have seen the number of notched Android phones growing increasingly this year, consumers are still divided on the notch.
She goes on to encourage to developers to test all screens and versions of their app experience to make sure they don't get buggy on devices with notches.
Google has rolled out guidelines to help OEMs and app creators develop for smartphones with display notches.
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