I am new Android developer and want to learn it.
I have some questions:
1) I want to use Eclipse as a tool. Do I still need to learn HTML5?
2) What is relationship between Eclipse and HTML5?
3) My goal is develop applications to run in Xoom (Android tablet) to connect our company's SQL server data.
Can I use HTML5 to do it?
Well, are you making a native app or a web app? Both are different things. The web app will be accessible via the browser. On iPhones you can create stand-alone HTML5 apps that looks like native apps; I don't know if the same is possible on a Xoom.