Different layout for mobile phone and tablet

Question

I want to develop an android xamarin android application for mobile phones and tablets. I would like to know how to do this?

I searched, and I found that creating separate layout files would help. But does this mean that for each page I need to add two layouts?

For a mobile phone, I would like to have two separate lines for mobile and FAX, while for a table I would like to configure them in one line approximately like this:

Mobile Phone Design:

Tablet design:

How can i get this?