How to extract data from a Wikipedia article?

[g-4]

I have a question regarding parsing data from Wikipedia for my Android app. I have a script that can download the XML by reading the source from \[code\]http://en.wikipedia.org/w/api.php?action=parse&prop=text&format=xml&page=ARTICLE_NAME\[/code\] (and also the JSON by replacing \[code\]format=xml\[/code\] with \[code\]format=json\[/code\]. But what I can't figure out is how to only access certain sections from the table of contents. What I want is when the page is loaded, the user can press a button that makes a pop-up appear that displays the headers from the table of contents and allow the user to read that piece and only that piece of it for convenience. I'm a little shaky with JSON but is it possible to do this? Or, is there an API from Wikipedia that allows the developer to only view certain parts of a page?Thanks!