我如何“保存状态”我的Recyclerview ItemDecorations＆amp;偏移？

Question

我有一个物品的RecyclerView和一个StaggeredGridLayoutManager类型的layoutManager。我处于一个有趣的情况，我希望我的项目交错看起来像这样：

但我的观点大小相同，所以他们不会错开。要纠正这个问题，我需要在第二列的开头添加一个偏移量。由于我还创建了自己的自定义装饰器类，我认为实现此目的的最佳方法是使用getItemsOffsets方法为列表中的第一个右列项添加偏移量。

以下是我的装饰器类的相关代码：

public class StampListDecoration extends RecyclerView.ItemDecoration {

...
@Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
    super.getItemOffsets(outRect, view, parent, state);
    // good example here: https://stackoverflow.com/questions/29666598/android-recyclerview-finding-out-first-and-last-view-on-itemdecoration/30404499#30404499

    /**
     *  Special case.  Te first right side item in the list should have an extra 50% top
     *  offset so that these equal sized views are perfectly staggered.
     */
    if (parent.getChildAdapterPosition(view) == 1) {

        /**
         *  We would normally do a outRect.top = view.getHeight()/2 to create a 50% top offset on the first right item in the list.
         *  However, problems would arise if we paused the app when the top right item was scrolled off screen.
         *  In this situation, when we re-inflated the recyclerview since the view was off screen
         *  Android would say the height of the view was zero.  So instead I added code that
         *  looked for the height of the top most view that was visible (and would therefore
         *  have a height.
         *
         *  see https://stackoverflow.com/questions/29463560/findfirstvisibleitempositions-doesnt-work-for-recycleview-android
         *  because as a staggeredGrid layout you have a special case first visible method
         *  findFirstVisibleItemPositions that returns an array of (notice the S on the end of
         *  the method name.
         */
        StaggeredGridLayoutManager layoutMngr = ((StaggeredGridLayoutManager) parent.getLayoutManager());
        int firstVisibleItemPosition = layoutMngr.findFirstVisibleItemPositions(null)[0];

        int topPos = 0;
        try {
            topPos = parent.getChildAt(firstVisibleItemPosition).getMeasuredHeight()/2;
        } catch (Exception e) {
            e.printStackTrace();
        }

        outRect.set(0, topPos, 0, 0);
    } else {
        outRect.set(0, 0, 0, 0);
    }

}

}

我的问题是，当我的活动暂停/恢复时，这些偏移不会保存到状态。因此，当我切换到另一个应用程序并切换回来时，我的RecyclerView中的右列滑回到顶部......我失去了我的错位。

有人可以告诉我如何保存我的偏移状态吗？应该保存偏移的位置在哪里？我假设LayoutManager会保存这些信息，我正在保存LayoutManager状态，但这似乎不起作用。