Android : set background of layout using image path

I want to put an image as background of a Layout.

First I am creating a drawable : Drawable d = Drawable.createFromPath("pathToImageFile");

In API level 8 layout.setBackground( d ) is not supported AND layout.setBackgroundDrawable( d ) is deprecated so I need to use

layout.setBackgroundResource(resourceID)

how can I get resourceID of a dynamically generated drawable.I am using this method :

Drawable d = Drawable.createFromPath("pathToImageFile");

to create a drawable.