title: How can I add padding to the background image on a button programatically?
body: <p>I'm creating a custom implementation that extends <code>android.support.v7.widget.AppCompatButton</code>. I am using <code>setBackground(Drawable)</code> in the button's constructor to put an image on the button, but want the image to be centered on the button with a little padding. How can I do this?</p>