Creating & Updating the data medium

I have a program that displays information which constantly changes. This program is stored as an HTML file and the actual information is calculated using several javascript files; all of this is located on a server.

Though the program isn't tidy it does what I want - it writes the data (lat & long) to a < p > tag in the HTML. My question is what is the easiest way to access this data from an android device? I don't simply want to load the screen on a web view. I want this specific information.

Can data which updates frequently be scraped from a website? Or would it be better practice to add the frequently updating data to a separate file like an XML file or a database can have the app constantly download this file using a service? If so is javascript capable of writing to this XML or database file?

Thanks!