title: change button image in android
body: <p>I want to change the image of a button in my code. I found this can be done in xml:</p>
  
  <p>please check <a href="http://developer.android.com/resources/tutorials/views/hello-formstuff.html" rel="nofollow noreferrer">this</a> link</p>
  
  <p>but the image will not stay on after I released the button. I want to click the button
  and the button change to a new image. Can this be done?</p>