How do I make home screen widget from rss feed?

This is a three-part question. I am new to Android and am trying to create a new app that reads RSS feeds and shows them on the home screen in the form of a widget.

1. What network calls are required to show a well-formatted RSS feed?
2. What layout structures can I use to hold the received content?
3. How can I make the web browser open the link to the RSS feed if the user selects it from this widget?

Thanks for your help!