title: Android: how to set the height/width of the src image of a ImageButton?
body: <p>Android: how to set the height/width of the image(src image intead of the background) of a ImageButton?</p>
  
  <p>I want to set the height/width of the top level image(not the background) image, the size of image should be customized instead of fullfill the button automatically</p>