I'm looking for a gratis Android widget to visually indicate if the device's WiFi is off.
There are probably literally thousands of such widgets, and I'm specifically looking for one that is extremely battery-friendly. I only want it responding to WiFi state changes, and nothing else.
In other words, if the device's WiFi is on or off, it should not consume any power. It should only consume power at the moment that the WiFi is toggled, at which point it will change it's visual indication (color, ideally).
Open-source is a plus, but not required.