gistfile1.txt

    /**
     * Need to return true here to continue hearing updates from the child
     * for the duration of the scroll
     */
    public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
        return true;
    }

    @Override
    public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
        int [] pos = new int[2];
        target.getLocationOnScreen(pos);
        if (pos[1] <= 0 && dy > 0) {
            Log.d(TAG, "onNestedPreScroll: child consumes");
            //allow the child to consume the event
        } else if (pos[1] <= 0 && target.getScrollY() > 0) {
            Log.d(TAG, "onNestedPreScroll: child consumes");
            //allow the child to consume the event
        } else {
            Log.d(TAG, "onNestedPreScroll: parent consumes");
            //we consume the event
            scrollBy(0, dy);
            consumed[1] = dy;
        }
    }