An advantage that smartphones have is the use of native applications. These apps can become even more powerful when they are allowed to perform tasks in the background. At a certain point, an app may want to alert you of various things. This is called a notification and it will sit in Android’s Notification Shade until it’s dismissed.
Similar to both the Home Screen and the Lock Screen, notifications and the Notification Shade are common across multiple mobile operating systems. Anyone who has moved from iOS will already be familiar with notifications and the concept of a Notification Shade (although, I’m not sure that is what Apple calls it).
Notifications come in from applications (and even the OS) throughout the day and are normally displayed as an icon somewhere in the Status Bar (typically on the left side). You will usually see a brief summary of what that notification wants to relay to you but it’s the Notification Shade that you usually go to see all of it.
For example, a notification that just came in may just want to tell you that you are now connected to a VPN but we learn more (and are sometimes presented with actions) when we go in and expand that notification.
So what we have here is my Pixel 2 XL sitting at the Home Screen. A single, one-finger swipe from the top of the screen gave me this result (with some notifications for demonstrative effect). At the very top, we have the Status Bar and this sits right above the handful of Quick Settings tiles that I mentioned above.
Pointing your attention to the bottom of the screenshot and you’ll see what I meant about it being a “shade.” You can still see the parts of my Home Screen that aren’t covered by notifications. If there weren’t any notifications in this screenshot then you would have gotten to see more of my Home Screen.
So again, it’s just a UI layer that has been put on top of whatever you’re currently doing.
The blank area of the said layer will have its opacity dropped down for a visual effect (but not all OEMs do this). Now, what we have in the middle is still the Notification Shade. It’s just the part of it where my notifications are being displayed. The area below it is still considered to be part of the Notification Shade.
I just wanted to highlight how and why it looks different when you have notifications waiting for you or not. I have put a green mask over the area that is just the notifications, but again, the area below it is part of the Notification Shade as well. When you swipe down to trigger this, the majority of the screen is covered by the shade.
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