Android 9 Pie vs Android 8.0 Oreo Walkthrough: What’s New

Fingerprint Scanner Changes

In Android 9 Pie Google made several changes to the fingerprint scanner, Pixel Imprint, and fingerprint sensor gesture controls, to name a few. 

For one, you'll see a colorful new icon and animation while you're adding a fingerprint to any phone with Android P. This is just cosmetic, but it helps you understand how far along you are in the print-saving process. 

You can also tap the fingerprint sensor to keep the phone awake. When your phone is in your hand (not a pocket) and the screen dims while you're reading or doing something, just tap the fingerprint sensor and it'll turn back on. This resets the "sleep timer" that's usually set for 30 seconds or 1-minute on most phones. It's just a nice quick way to keep the screen on without touching the display.