title: android changing button colors turns button orange when clicking... why?
body: <p>I've got some buttons that I want to change background colors upon clicking.  As a quiz app, they'll turn red if the wrong one is clicked and green if the right one is clicked.  I also wanted to reset the buttons back to default when the question is switched to repeat the process of selecting an answer.</p>
  
  <p>My problem is when I went to implement:</p>
  
  <pre><code>buttonOne.setBackgroundResource(android.R.drawable.btn_default);
  buttonTwo.setBackgroundResource(android.R.drawable.btn_default);
  buttonThree.setBackgroundResource(android.R.drawable.btn_default);
  buttonFour.setBackgroundResource(android.R.drawable.btn_default);
  </code></pre>
  
  <p>Which is supposed to reset the buttons back to default (right?).  Now, when I click the buttons and hold them down the background is orange, and I have no idea why.  Anyone know why this is?</p>
  
  <p>I haven't set anything to orange so it seems quite random.</p>