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