How to change `solid color` from the code?

Question

I have a Shape defined in xml. Now I need to change a solid color from the code, could you please advice how?

Answer 1

I use this in my code

GradientDrawable myGrad = (GradientDrawable)rectangle.getBackground();
myGrad.setColor(Color.BLACK);

Hope this helps :)

EDIT: for GradientDrawable instead of ShapeDrawable

Answer 2

I met the problem when I set the background of the item(in the listview)the shape defined in xml, I've got ClassCastException when I invoke the convertview's getBackground() method, but when I invoke the item's outest view's getBackground() method,the Exception disappear, the problem resolved.