title: android onclickuplistener for an imageview button?
body: <p>I'm trying to use an <code>ImageView</code> as a <code>Button</code>, and I want to be able to change the image whenever the button's pressed. I have an <code>OnClickListener</code> set, but what do I have to do about when the user's finger is no longer down, over the button? How do I revert to the original image?</p>