Android app parsing web-page and notifying user about changes

The app is android application which will notify the user when new record will be added to web-page. So the task of the application is to parse the web-page and notify user if the new record was added.(app should run in background and notify user with signal, as email client for example). Business logic of app is following : User opens app User populates necessary fields(about five fields by which content app will parse the web-page) App parses web page every 5 minutes and if new record was added, notifies user with signal (as email clients works. even if app is running in background). User should be able to turn-off the notifications whenever he wants or add another rule for parsing. More detailed information and description will provided off course.