How to create a sliding panel like google calculator app?

[Android Central Question]

I am trying to learn app development by creating small apps. Currently i am building a calculator with scientific functionalities. This is the current state of the application.

Now i want to add the scientific buttons to a separate XML file and want that window to slide over the current keyboard part (by swiping or clicking on specific button) Just like the google calculator app.

Can anyone Please tell me how to do that? Thanks

 

[B. Diddy]

I moved this to the Software Development forum for more specific traffic.