When I run my application, buttons are not displaying(A little part is displaying, that makes feel that something is there), although I scroll down.
How to solve my problem. Is there any way to set size of textboxes (Where size depends on screen size).
When I run my application, buttons are not displaying(A little part is displaying, that
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As @100rabh already said you should really start reading about Android layouts.
Some very good articles by Romain Guy are here and of course on his blog.
There is also a very good series of articles on Mobiletuts+ called Android User Interface Design by Lauren Darcey and Shane Conder.
You should really check that out and then redesign your layout.