How to set width and height for custom view in programmatically?

You must override the onMeasure() method of the View.

For a nice example you can check here: http://kahdev.wordpress.com/2008/09/13/making-a-custom-android-button-using-a-custom-view/

And a very cool video that I would recommend is here: http://marakana.com/forums/android/general/563.html

Hope this helps!

Override the onMeasure() method, have a look here