Android P feature spotlights: Adaptive brightness animates the quick settings slider as it changes
Adaptive brightness has long been a feature of Android smartphones. It uses an ambient light sensor, usually placed above the display, to measure the amount of light in the environment and change the brightness of the screen to best suit the conditions. It’s often noticeable when changes occur, particularly right after you unlock your device, but now the quick settings brightness slider moves in tandem to further demonstrate this.
It doesn’t appear as though anything about the way adaptive brightness works is actually changing, only that the slider is offering greater visibility of the changes that are happening in the background.
Android P feature spotlights: Adaptive brightness animates the quick settings slider as it changes was written by the awesome team at Android Police.