Draw specific gradient programmatically

Question

I want to draw a specific gradient programmatically - something like this:

Could you please help me? I investigated that I can do

    GradientDrawable gd = new GradientDrawable(
            GradientDrawable.Orientation.LEFT_RIGHT,
            new int[] {0xFF616261,0xFF131313});
    gd.setCornerRadius(0f);

But the output gradient is linear, not like mine.

Thanks!