I would like display for example this html code:
Hello World
This is a test of the URL &
All the styling supported by the XML resources system is explained in the Android documentation.
String Resources: Formatting and Styling
Anything included there can be used and set directly on TextView. If you need to use further HTML markup, you will need to place raw HTML (with escaped characters for <, > and such) into the resource and load the entire thing in a WebView.