Set default background behind an activity's layout

Question

I have an activity with its layout set to an XML file. the root layout is a RelativeLayout and i am setting the background to this layout via rootLayout.setBackgroundResource(R.drawable.default_background);

this drawable, R.drawable.default_background has some transparency in it.

It seems as though the default background of any layout is black. when i set the background to this drawable resource, the default black background seeps through the semi-transparent drawable.

How can i change the default background behind this drawable to white instead of black?

edit: i do not want to change the theme, as that changes more than just background

Answer 1

Make the root view of the layout a FrameLayout which contains your RelativeLayout, and make the FrameLayout's background white.