ImageButton usage and changing pictures
<ul>
<li><p>how do you change the image of an ImageButton during runtime?
for Button, you can say setText("some text")
for ImageButton is there any setImage() such that I can change the image  during runtime?</p></li>
<li><p>where do you place the pictures? drawable hdpi,ldpi,mdpi..what exactly is the difference between all of them?</p></li>
</ul>
