RecyclerView：第一张图像加载完成后加载另一张图像

Question

我有一个Recyclerviewer，可在用户滚动时重新加载照片。但由于我连续拍了3张照片，我遇到了一个问题：

我需要一次最多加载12张照片，以确保recyclerview可滚动。每次滚动发生时，继续一次加载12张照片。这并不是真的很好。如何让我的recyclerviewer等待第一张照片加载，一旦完成，请加载下一张照片直到屏幕填满。并且只有当用户开始滚动到＆＃34;白色空间＆＃34;更多图片开始显示？这是我的RecyclerViewer：

private void InitRecView()
        {
            mRecyclerView = FindViewById<RecyclerView>(Resource.Id.recyclerView);



            if (picturesinarow != 1)
            {
                //3 in a row
                loadPhotos.LoadMoreItems(12);//(Constants.LOADNEXTITEMSTHRESHHOLD);

            }
            else
            {
                loadPhotos.LoadMoreItems(3);
            }

            mLayoutManager = new GridLayoutManager
               (this, this.picturesinarow, GridLayoutManager.Vertical, false);
            mRecyclerView.SetLayoutManager(mLayoutManager);
            mAdapter = new PhotoAlbumAdapter
                (loadPhotos, this.picturesinarow, (RecyclerLayout)this.recyclerLayout, this.hasHeader, this.thumbnails, this);

            mRecyclerView.SetAdapter(mAdapter);
            mLayoutManager.SetSpanSizeLookup(new GridViewSpansizeLookup(mAdapter, mLayoutManager));

            var onScrollListener = new XamarinRecyclerViewOnScrollListener(mLayoutManager);

            onScrollListener.LoadMoreEvent += (object sender, EventArgs e) =>
            {
                int oldCount = loadPhotos.pictures.Count;

                if (picturesinarow != 1)
                {
                    //3 in a row
                    loadPhotos.LoadMoreItems(12);

                } 
                else
                {
                    loadPhotos.LoadMoreItems(2);
                }

                if (!mRecyclerView.IsComputingLayout)
                    mAdapter.NotifyItemRangeChanged(oldCount - 1, loadPhotos.pictures.Count);

            };


            mRecyclerView.AddOnScrollListener(onScrollListener);
            mAdapter.ItemClick += OnItemClick;

        }