I usually set up some kind of AlertDialog to fire off when a user first uses one of my apps and I explain how to use the app and give an overall introduction to wha
AlertDialog
Just use an HTML format link in your resource:
Click me!
You can then use setMovementMethod(LinkMovementMethod.getInstance()) on your TextView to make the link clickable.
setMovementMethod(LinkMovementMethod.getInstance())
TextView
There is also TextView's android:autoLink attribute which should also work.
android:autoLink