gistfile1.java

        DecorChildLayout(Context context, ViewGroup systemDecorView, View headerView) {
            super(context);

            // Move all children from decor view to here
            for (int i = 0, z = systemDecorView.getChildCount() ; i < z ; i++) {
                View child = systemDecorView.getChildAt(i);
                systemDecorView.removeView(child);
                addView(child);
            }

            /**
             * Wrap the Header View in a FrameLayout and add it to this view. It is wrapped
             * so any inset changes do not affect the actual header view.
             */
            mHeaderViewWrapper = new FrameLayout(context);
            mHeaderViewWrapper.addView(headerView);
            addView(mHeaderViewWrapper, ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);

            requestFitSystemWindows();
        }