How to save XML file as my app internal file

I am developing RSS news reader app, and having trouble with some issues,

the problem is,

I am using SAX parser to load the RSS Feed, what I want to do is when the RSS Feed is loaded first time, it should be save within the app somewhere and when next time app is launched, the internal rss feed is launched instead of loading from the internet.

All I want to ask that, how can I load and save XML file within my app when app is loaded ?