title: Changing the image of a button in a different layout
body: <p>I'm a bit stumped on this. I have a button in an 'Upgrades' activity that will change the image of an imagebutton in my Main Activity. </p>
  
  <p>How would I go about doing this?</p>
  
  <p>I simply want the image of that button to change/update when the upgrades button is clicked.</p>