具有 2x1 排列的 Gridlayoutmanager

Question

我正在尝试使用 recyclerview 中的 gridlayoutmanager 制作如下 UI：

+-------+ +-------+
|       | |       |
|       | |       |
|       | |       |
+-------+ +-------+
+-----------------+
|                 |
|                 |
+-----------------+

我在此处调整 onBindViewHolder 中的宽度：

int mode = (position+1)%4;
        int h_mul = 1, w_mul = 1;
        switch (mode){
            case 0:
                h_mul = w_mul = 2;
                break;
            case 2:
                w_mul = 2;
                break;
            case 3:
            case 1:
            default:
                h_mul = w_mul = 1;
                break;
        }
        mCardView.getLayoutParams().height = h_mul * mContext.getResources().getInteger(R.integer.video_tile_height);
        mCardView.getLayoutParams().width = w_mul * mContext.getResources().getInteger(R.integer.video_tile_width);

我尝试了很多方法： 1. 带有 setSpanSizeLookup 的水平 gridlayoutmanager:

    manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            int mode = (position+1)%4;
            switch (mode){
                case 0:
                case 2:
                    return manager.getSpanCount();
                case 3:
                case 1:
                    return 1;
                default:
                    return -1;
            }
        }
    });

我最后的结果是：

+------------+  +-----------------------------+ +------------+
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
+------------+  +-----------------------------+ +------------+

如果我不设置跨度，那么它会像这样结束：

+------------+               +---------------+
|            |               |               |
|            |               |               |
|            |               |               |
|            |               |               |
|            |               |               |
+------------+               +---------------+

+---------------------------+
|                           |
|                           |
|                           |
|                           |
|                           |
+---------------------------+

水平交错网格布局管理器。如果是使用

 StaggeredGridLayoutManager.LayoutParams layoutParams = (StaggeredGridLayoutManager.LayoutParams) holder.itemView.getLayoutParams();
        layoutParams.setFullSpan(true);

然后就和

一样了

+------------+  +-----------------------------+ +------------+
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
+------------+  +-----------------------------+ +------------+

如果我最初不使用全跨度，它是完美的，但如果我滚动 recyclerview，它就会变得与上面相同：

+------------+  +-----------------------------+ +------------+
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
|            |  |                             | |            |
+------------+  +-----------------------------+ +------------+

我不明白是什么原因造成的。有人可以指出我可能犯了什么错误吗？

Answer 1

您想要实现水平回收器视图，其中重复出现这三个框。但是您将这 3 个框视为单独的回收器项目的方法不允许您将它们成组滚动。您需要做的是定义一个单独的布局，其中包含这 3 个框。然后为它提供 3 个项目的数据并将其绑定到视图持有者

基本上，您必须操作要分组的数据，然后显示它。

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if (viewType == GROUP_ITEM) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.group_item, parent, false);
        return new GroupViewHolder(view);
    } else if (viewType == SINGLE_ITEM) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.single_item, parent, false);
        return new SingleViewHolder(view);
    }

    return null;
}

public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    if (holder instanceof GroupViewHolder) {
        ((GroupViewHolder) holder).populateData(position);
    } else if (holder instanceof SingleViewHolder) {
      // populate your normal view.
    }
}

具有 2x1 排列的 Gridlayoutmanager

Gridlayoutmanager with 2x1 arrangement

android

android-recyclerview

gridlayoutmanager

staggeredgridlayoutmanager