How to draw a smooth/dithered gradient on a canvas in Android

Question

Several answers mention to use GradientDrawable.setDither(true) to draw smooth gradients in Android. That has no effect in my code. Any idea what I have to change to get a well looking gradient in my live wallpaper?

GradientDrawable gradient = new GradientDrawable(Orientation.TL_BR, colors);
gradient.setGradientType(GradientDrawable.RADIAL_GRADIENT);
gradient.setGradientRadius(canvas.getWidth() * 2);
gradient.setDither(true);g
gradient.setGradientCenter(-0.1f, -0.1f);
gradient.setBounds(cb);
gradient.draw(canvas);

Answer 1

Possible duplicate: http://stackoverflow.com/questions/2791045/is-it-possible-to-dither-a-gradient-drawable.