Android :: How To Find Out Screen Status Active / Dark?

I've dug through the documentation but couldn't find a call that would fit: Is there a way to find out the screen status (Active/dark)?I've got an app that implements the relevant data processing and backend server connectivity through a Service that I keep running on a reduced activity level when the user puts the device to sleep (using end button), or when the screen timeout hits. In the app code, I can follow this status change, because it triggers calls to overloaded onStop() and onPause() methods of the app's subclassed Activity. This way, I control active/reduced ("sleep") activity levels of that Service. Everything's cool and dandy in this scenario.Enter an AppWidget that's using this Service in a similar fashion, with functionality implemented in a subclass of AppWidgetProvider. This changes the game - I have found no way to determine when to set the Service to the reduced ("sleep") activity level from that point. The app's Activity has long paused, and I keep the Service at active level, as the widget needs updates from the Service similar to what the Activity needs when in front. With the AppWidget on the home screen, I want, and should (re: battery life), drop the Service's activity level when the device enters sleep mode. The most elegant way to handle this would be to detect whether the screen is dark, right inside the Service.