title: image in layout is different from image loaded in emulator
body: <p>My problem is as follows: </p>
  
  <p>I have a layout called layoutscreen.xml . On this layout I have various buttons. To add a resource I went to imagebutton which took me to the resource screen and then added a particular image in this case basic.png. I got this off my hard drive and I noticed the image had not rescaled properly. I then went too drawable-hdpi and replaced basic.png that had been shrunk with a new copy off my hard drive. </p>
  
  <p>Therefore showing the full sized image. I then went to background and changed it to the resource of the new image. It displayed fine. The problem was when I ran the emulator the old basic.png was still there after the replacement. </p>
  
  <p>What is the best practice to add an image to a button?</p>