Tip: Replying to a notification in Android P no longer dismisses it, multiple replies are possible (Updated)
Android P DP2 adds 'Manage notifications' shortcut to the notification shade
In Android P, notifications for apps running in the background show if they're using the camera or microphone
Tip: Swiping high up on Android P's home button opens the app drawer (on the homescreen), quickly swiping to the side switches to the previous app
Android P DP2 shows alarms and muted/vibrate ringer status on top of the Quick Settings
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Android has been combating mischievous apps that run in the background for several years. It started with showing you a notification each time an app did something in the background, and with the first P developer preview, a tighter control was put in place for idle apps (different from background apps) to stop them from using the microphone or camera. But there's one more change coming with Android P, as seen in the screenshot above.
If a background app uses either the camera or microphone, Android will show the notification to let you know that app is running but it will also display a camera and/or microphone icon to clearly tell you which hardware elements or sensors it's using. Since I haven't tested P DP1, I can't tell if this is new to DP2 or if it was there already with DP1, but it's still a new Android P feature that we didn't see in Oreo.
I'm liking this level of transparency in the system. If an app is abusing its camera or microphone permissions and doing something it shouldn't be, now you can see it.
- Nick Cipriani