class StaggeredGridLayoutManager extends RecyclerView.LayoutManager implements
        RecyclerView.SmoothScroller.ScrollVectorProvider {

    public void scrollToPositionWithOffset(int position, int offset) {
        if (mPendingSavedState != null) {
            mPendingSavedState.invalidateAnchorPositionInfo();
        }
        mPendingScrollPosition = position;
        mPendingScrollPositionOffset = offset;
        requestLayout();
    }

    @SuppressWarnings("unused") public  StaggeredGridLayoutManager(Context context, AttributeSet attrs, int defStyleAttr,
            int defStyleRes);
    public  StaggeredGridLayoutManager(int spanCount, int orientation);

}