android - RecyclerView with GridLayoutManager in RecyclerView with LinearLayoutManager

Question

我基本上是在尝试实现这个设计原则(from Google's Material Design): 因此，我创建了一个带有 LinearLayoutManager 的父级 RecyclerView，然后在 RecyclerView 适配器中，我将子级 RecyclerView 和用于“富媒体”部分(操作区域 2)的 GridLayoutManager。一切正常，除了我将内部 RecyclerView 网格设置为具有 match_parent 宽度和 wrap_content 高度，但它不会正确计算内容的大小，似乎将其保留为 0 并因此隐藏。如果我将子 RecyclerView 设置为特定高度，项目会显示在其中，但当然会在底部被切断。其他人似乎也遇到过这个问题，but in their case, both have linear layouts。 (另见 "Khay's" answer here 。)

现在我的问题是，如何像“pptang”在上面链接问题的接受答案中所做的那样覆盖 onMeasure 方法，而是在自定义 GridLayoutManager 中自定义 LinearLayoutManager？我没有在这里发布我的代码，因为它本质上与链接的代码相同，只是我需要为子 RecyclerView 创建一个自定义的 GridLayoutManager，这样它正确测量为“pptang 的”回答状态。

否则，有没有比在第二个 RecyclerView 中使用 1 个 RecyclerView 更好的方法？只能使用 1 个 RecyclerView 填充一个 Activity/fragment ，同时使用上述 CardViews 列表和每个 CardView 中的唯一项目网格？

Answer 1

您可以使用库 SectionedRecyclerViewAdapter 仅使用一个 RecyclerView 来构建它.

您可以找到下图示例的完整代码 here .

首先创建一个Section类:

class MySection extends StatelessSection {

    String title;
    String subtitle;
    List<String> list;

    public MySection(String title, String subtitle, List<String> list) {
        // call constructor with layout resources for this Section header, footer and items 
        super(R.layout.section_header, R.layout.section_item);

        this.title = title;
        this.subtitle = subtitle;
        this.list = list;
    }

    @Override
    public int getContentItemsTotal() {
        return list.size(); // number of items of this section
    }

    @Override
    public RecyclerView.ViewHolder getItemViewHolder(View view) {
        // return a custom instance of ViewHolder for the items of this section
        return new MyItemViewHolder(view);
    }

    @Override
    public void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position) {
        MyItemViewHolder itemHolder = (MyItemViewHolder) holder;

        // bind your view here
        itemHolder.tvItem.setText(list.get(position));
    }

    @Override
    public RecyclerView.ViewHolder getHeaderViewHolder(View view) {
        return new SimpleHeaderViewHolder(view);
    }

    @Override
    public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder) {
        MyHeaderViewHolder headerHolder = (MyHeaderViewHolder) holder;

        // bind your header view here
        headerHolder.tvTitle.setText(title);
        headerHolder.tvSubTitle.setText(subtitle);
    }
}

然后您使用您的 Sections 设置 RecyclerView:

// Create an instance of SectionedRecyclerViewAdapter 
SectionedRecyclerViewAdapter sectionAdapter = new SectionedRecyclerViewAdapter();

// Create your sections with the list of data for each year
MySection section1 = new MySection("Title", "Subhead", firstDataList);

// Add your Sections to the adapter
sectionAdapter.addSection(section1);

// Set up your RecyclerView with the SectionedRecyclerViewAdapter
GridLayoutManager glm = new GridLayoutManager(getContext(), 2);
glm.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
    @Override
    public int getSpanSize(int position) {
        switch(sectionAdapter.getSectionItemViewType(position)) {
            case SectionedRecyclerViewAdapter.VIEW_TYPE_HEADER:
                return 2;
            default:
                return 1;
        }
    }
});
recyclerView.setLayoutManager(glm);
recyclerView.setAdapter(sectionAdapter);