class GridLayoutManager extends LinearLayoutManager {

    public SpanSizeLookup getSpanSizeLookup() {
        return mSpanSizeLookup;
    }

    public  GridLayoutManager(Context context, AttributeSet attrs, int defStyleAttr,
                             int defStyleRes);
    public  GridLayoutManager(Context context, int spanCount);
    public  GridLayoutManager(Context context, int spanCount,
            @RecyclerView.Orientation int orientation, boolean reverseLayout);

}