Like it or not, notched phones are here to stay, at least for the foreseeable future.
If any of you insane phone makers are thinking about building a phone with three or more notches, probably don't do that. As such, Google has given official guidance on the matter, saying that devices should have no more than two notches. Just like Gillette and Schick add blades that we don't need as a marketing ploy to sell more razors, there will one day soon be an Android phone that tries to squeeze out a few extra pixels by adding a second notch. So, this seems like a case of Google trying to nip a potential problem in the bud before some upstart manufacturer runs wild with a screen that's missing chunks on all four sides. With Apple going for the notch on their flagship iPhone X, the notch has been considered as the guideline for narrow-bezel- design displays this year.
"These striking displays present a great opportunity for you to showcase your app".
Google said the move is to ensure consistency and app compatibility with devices that do have cutouts.
To be clear, there aren't any mainstream devices with more than one notch available at the moment.
Another rule set by Google states that: "In portrait orientation, with no special flags set, the status bar must extend to at least the height of the cutout".
The device makers should ensure their love for notches doesn't degrade the experience for the users. There are some who feel it is too distracting, asymmetrical and spoils the overall aesthetics of the device while others who are not too bothered by it.
Keep in mind these rules are for the Android manufacturers that want Google's support with the Play Store and services, which is obviously the lion's share of Android devices out there in the wild.
Notches have become a necessary evil of this design trend in order to provide space for sensors and cameras on the front of the device.
Google adds that device makers will not be able to place cutouts on the left or right "long edges" of their devices.