WLC

This app is used for searching WLAN in the vicinity and list them.
It can also match a certain SSID with the searched list.

If the SSID name is found the text turns green, otherwise it turns gray.

Icon provided by:
http://shop.devcom.com/en/8-free-icons

The code for this app can be retrieved from here:
http://familjenwik.com/wiken/android/WLC.zip
Use it, change it. Even commercially.
If any questions occur, I can recommend http://www.stackoverflow.com.
People in those forums are very good, and many answers is to be found there.