Force WiFi Scan (com.anticsoft.wififorcescan) on Google Play
This app does one thing and one thing only, it triggers your wifi to scan for networks. That's it. Nothing more nothing less. There is no UI, you get a Toast notification that the scan has been triggered. I wrote this app for my home automation, my automation (I use AutomateIT) app is set up to trigger my house to disarm the alarm when my phone connects to WiFi. Problem is, it wasn't connecting to the wifi for several minutes after getting home. So I use AutomateIt to run this app as soon as my Bluetooth disconnects (aka when I turn off my car), causing my wifi to connect sooner, thus disarming my alarm system before I get in the door.I know, it's a long winded explanation for something so basic, just thought I'd explain WHY I wrote the app