Android :: Standard Android Button With Different Color

I'd like to change the color of a standard Android button slightly in order to better match a client's branding. For example, see the "Find a Table" button for the OpenTable application:

The best way I've found to do this so far is to change the Button's drawable to the following drawable located in res/drawable/red_button.xml:

CODE:.................

But doing that requires that I actually create three different drawables for each button I want to customize (one for the button at rest, one when focused, and one when pressed). That seems more complicated and non-DRY than I need.

All I really want to do is apply some sort of color transform to the button. Is there an easier way to go about changing a button's color than I'm doing?