title: How to get a Button's background back to default (programmatically)?
body: <p>So I'm setting a button's background doing this:</p>
  
  <pre><code>b.setBackgroundResource(R.drawable.custom_button1);
  </code></pre>
  
  <p>How do I programmatically set it back to the default (boring grey) Android button? Is there a R.android.boring_grey resource identifier I can reference without recreating those states myself? Couldn't seem to find it. Maybe my Googling skills are failing me.</p>
  
  <p>Oh and by the way I tried this:</p>
  
  <pre><code>   b.setBackgroundResource(0);
  </code></pre>
  
  <p>And the button actually disappeared (blended with black background?).</p>