How to change dialog background color programmatically?

Question

I have a main activity where users can change (via preferences) the background colour to their favourite colour. My problem is that I can not change the background colour o

Answer 1

The suggested solution

d.getWindow().setBackgroundDrawableResource(R.drawable.menubackground);

Do not work well (tested in 6.0) as it changes the dialog shadow

Here Is my solution:

 public static void changeDialogBackground(final Dialog dialog,final int resId) {
    dialog.getWindow().getDecorView().setBackgroundResource(resId);
    dialog.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(final DialogInterface dialog) {
            Window window = ((AlertDialog)dialog).getWindow();
            window.getDecorView().setBackgroundResource(resId);
        }
    });
}