How do I specify different layouts for portrait and landscape orientations?
Create a layout-land directory and put the landscape version of your layout XML file in that directory.
You just have to put it under separate folders with different names depending on orientation and resolution, the device will automatically select the right one for its screen settings
More info here:
http://developer.android.com/guide/practices/screens_support.html
under "Resource directory qualifiers for screen size and density"