LayoutManager findCompletelyVisibleItemPosition返回错误的值

Question

我有下面的代码，我的适配器和我的LayoutManager（网格）设置在此代码之上，但

返回的值

  

findLastCompletelyVisibleItemPosition

有时是错误的（例如，返回1而不是5） 我认为这种方法很少有问题，

我怎样才能获得好的价值？

holder.mRecyclerViewImage.postDelayed(new Runnable() {
                @Override
                public void run() {
                    if (holder.mLastVisibleItems == -1)
                        holder.mLastVisibleItems = holder.mGridLayoutManager.findLastCompletelyVisibleItemPosition();
                    Log.d("myItemPosition", holder.mLastVisibleItems + "");
                    if (holder.mLastVisibleItems == 0 || holder.mLastVisibleItems == -1)
                        return;
                    int deleted = 0;
                    ArrayList<String> saveList = new ArrayList<>(listUrlImg);
                    while (holder.mLastVisibleItems + 1 < listUrlImg.size()) {
                        listUrlImg.remove(holder.mLastVisibleItems + 1);
                        deleted++;
                    }
                    holder.mRecyclerViewImage.setAdapter(new ImageAdapter(saveList, listUrlImg, deleted));
                }
            }, 100);