Android programming question

Is it possible to add a phone number in an app? For instance, I am creating an app for my business and I would like to include a phone number that when the button is pressed -- will automatically call. I am using Eclipse.

I know it is possible using Dreamweaver 5.5. As I did it before, but I am using Eclipse now to make a better app, because Dreamweaver is all straight HTML, CSS, JS.