September 2014
Primitive example Android app (with a php / text file backend) to teach about data collection. The code sends data including 'lat/long/visible SSIDs/associated wifi strength' and saves it to a space-delimited text file with each line possessing the format:
lat lon accuracy att use string
As it stands, the app has no error catching. So, expect crashes if the device has wifi turned off (and similar states).