Default Calculator Layout

Guys I am trying to implement this layout.

I have been able to implement the calculator layout with "Clear button too but not able to overlap the Clear button...Any help will be appreciated.

Actual Layout which I want to implement:

Implemented till now :


Aptitude Cracker - An Application for all Competitive Exams and all In One Aptitude Preparation
DroidAcid - Get all android tutorials and Micromax CanvasHD A116 guides.