MyDrawerLayout.java

class MyDrawerLayout extends DrawerLayout {
	
	// ...
	
	@Override
	public void addView(View child, int index, ViewGroup.LayoutParams params) {
		if(child instanceof ViewGroup) {
			ViewGroup childVG = (ViewGroup)child;
			if(childVG.getBackground() == null && childVG.getChildCount() == 1) {
				View realChild = childVG.getChildAt(0);
				ViewGroup.LayoutParams lp = realChild.getLayoutParams();
				if(realChild.getBackground() != null
						&& lp.width == ViewGroup.LayoutParams.MATCH_PARENT
						&& lp.height == ViewGroup.LayoutParams.MATCH_PARENT) {
					child.setBackgroundDrawable(realChild.getBackground());
					realChild.setBackgroundDrawable(null);
				}
			}
		}
		
		super.addView(child, index, params);
	}
	
	// ...
	
}