合并多个 RecyclerView.Adapter 以用于单个 RecyclerView (Android)

Question

我有一个 json 字符串，我将其分成 4 个数据集，每个数据集都有自己的 RecyclerView.Adapter。

我想在同一个 RecyclerView 中输出所有适配器，最好为每个适配器使用 StickyHeaders。

我相信这可以通过 CommonsWare 的 CWAC-merge ( https://github.com/commonsguy/cwac-merge ) 使用 ListViews 来完成

关于如何使用 RecyclerView 或应该如何完成的任何想法？ 我是一个成熟的开发人员，所以响应越不抽象越好;-D

谢谢。

Answer 1

在 Recyclerview 小部件的新更新中，您可以使用MergeAdapter类

import androidx.recyclerview.widget.MergeAdapter

实例化适配器：

 private val mfirstAdapter = FirstAdapter()
 private val mSecondAdapter = SecondAdapter()

 // here is MergeAdapter class
 private val adapter = MergeAdapter(mfirstAdapter , mSecondAdapter )

然后使用：

 binding.recycler.adapter = adapter

如何更新适配器：（如果使用 diffUtils，则使用 .submitList，否则使用 notifyDataSetChaned()）

  mfirstAdapter.submitList(myDataArrayList.subList(0, 10))
  mSecondAdapter.submitList(myDataArrayList.subList(10, list.size - 1))

Answer 2

您只需使用一个适配器即可实现这一点： SectionedRecyclerViewAdapter 。 使用这个库，您可以将您的项目分组到部分中，并且您可以选择向它们添加页眉和/或页脚。

首先创建一个 Section 类来对您的项目进行分组：

class MySection extends StatelessSection {

    String title;
    List<String> list;

    public MySection(String title, 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.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.tvItem.setText(title);
    }

    public void addRow(String item) {
        this.list.add(item);
    }

}

然后你用你的部分设置 RecyclerView：

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

// Create your sections with the list of data
MySection section1 = new MySection("Header of section 1", section1List);
MySection section2 = new MySection("Header of section 2", section2List);

// Add your Sections to the adapter
sectionAdapter.addSection(section1);
sectionAdapter.addSection(section2);

// Set up your RecyclerView with the SectionedRecyclerViewAdapter
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setAdapter(sectionAdapter);

Answer 3

我会去这个图书馆： https : //github.com/martijnvdwoude/recycler-view-merge-adapter

查看 Github 页面上的文档，了解如何在代码中使用它的示例。

摘自自述文件：

RecyclerView myRecyclerView = (RecyclerView) view.findViewById(R.id.my_recycler_view);

// Create new merge adapter
RecyclerViewMergeAdapter mergeAdapter = new RecyclerViewMergeAdapter();

// Add any number of subadapters to merge adapter
MyRecyclerViewSubAdapter subAdapter1 = new MyRecyclerViewSubAdapter();
MyRecyclerViewSubAdapter subAdapter2 = new MyRecyclerViewSubAdapter();

mergeAdapter.addAdapter(subAdapter1);
mergeAdapter.addAdapter(subAdapter2);

// Set merge adapter to RecyclerView
myRecyclerView.setAdapter(mergeAdapter);

Answer 4

你可以看看GroupAdapter

GroupAdapter.Builder builder = new GroupAdapter.Builder();
builder.add(firstAdapter);
builder.add(secondAdapter);
GroupAdapter groupAdapter = builder.build();
recyclerView.setAdapter(groupAdapter);

Answer 5

我做了一个完全按照你想要的课程https://gist.github.com/agustindev/e2faa7ef6a7b61cc0eafeeaf81e4e434

    ...
    val multipleAdapter = MultipleAdapter()
    val adapter1 = object: RecyclerView.Adapter<RecyclerView.ViewHolder>(){ ... }
    val adapter2 = object: RecyclerView.Adapter<RecyclerView.ViewHolder>(){ ... }
    val adapter3 = object: RecyclerView.Adapter<RecyclerView.ViewHolder>(){ ... }
    multipleAdapter.addAdapter(adapter1)
    multipleAdapter.addAdapter(adapter2)
    multipleAdapter.addAdapter(adapter3)

    recyclerView.adapter = multipleAdapter