System.
UI is one of the core applications of Android operating system without system UI.
The Android operating system cannot really function.
So let's dig a little bit more deeper into system UI and its associated modules.
What's system UI?
So system UI refers to any element displayed on the screen that is not part of an application.
So any UI element, it is not part of a standard Android application belongs to system UI.
So for example, the status bar, which you see at the top or the navigation bar which you see at the
bottom.
But let's have a look at the US system UI components.
So the status bar at the top belongs to system UI, the navigation bar at the bottom, the system UI,
the key guard lockscreen comes after the android OS is boot up and before the launcher.
That's the that's part of system UI.
And then the power UI is screen which shows the power information that system UI.
Then the recent screen where you have the recent applications.
And then volume UI where you can adjust the volume.
Then the stack divider.
This is the split screen divider.
It's again part of system UI in the UI, which is basically an overlay, like for example, a video
overlay on top of another video that's called as a UI.
So that's again implemented as part of system UI.
Then the screenshot interface belongs to the system UI and the ringtone player.
These all are actually different components of system UI.
So now let's open up an emulator and have a look at some of these modules.
This is the status bar where you have the time and other icon information and here you have got the
battery range and Wi-Fi.
So this is the status bar and the navigation bar is what you see at the bottom.
So here you have the back button, the home button and the recent application button.
And then the key guard is the screen, which you see when you switch on the phone.
This one here, you swipe and it opens the launcher.
So in the key guard, you could configure different security mechanisms like you could have a password
or you could have a pin code or a pattern, for example.
And then the recent screen.
Is this one.
So.
Currently I don't have any recent item.
Let me open this one, for example.
And maybe this one, this happened.
Now I have the messaging app and the Chrome app in the recent item.
So this belongs to system UI and then the volume UI is nothing but this one.
So where you can increase the volume and if you click here, you get the details.
So the media volume, all volume, ringtone volume and alarm volume, and then you have got the stack
divider.
This is basically the split screen.
When I opened the recent item, if I click here, I can go to the split screen.
So in the split screen we can divide the screen into two parts where you can have one app at the top
and another app at the bottom.
So the split screen divide, this is again implemented as part of system UI.