WiFi.RSSI(); Not updating?

Sorry I should have explained the reasoning beforehand.

I will transmit the signal strength to Processing, here I will produce a simple signal strength bar chart, similar to the ones you see on cell phones. Eventually this will go onto an android application.

I know my RSSI value is chancing since I am using an application on a android devise to show that the RSSI value is changing as I move physical locations.