When I first started android development there were no real devices. All you could use was that awfully slow emulator. When I got my first device, the HTC Dream, I realized the native WiFi scan functionality was limited. I also realized there were no WiFi scanner apps on the store, so I made the first WiFi scanner app for Android! Years passed since then and I finally found some time to update that old, 2010 looking app (check the photo to judge for yourself) to a modern one with material design.
Download it for free here!