title: Android: how to draw an ImageButton using the pressed state drawable for the focused state
body: <p>I am trying to achieve an effect where, once pressed, an ImageButton draws with the "pressed" orange background until it loses focus (something else is touched).  </p>
  
  <p>StateListDrawable seems intended for this situation, because it would allow me to define how the background should be drawn for the focused state.  And it would be great if I could simply define that the background should be drawn with the pressed drawable, for the focused state.  However, I see no way to reference the default "pressed" drawable.</p>
  
  <p>Any advice on how I can achieve this effect?</p>