在 recyclerview 中添加两个部分 android

Add two sections in recyclerview android

在我的应用程序中,我使用 recyclerview 来显示所有联系人列表。 我想要 recyclerview 中的两个部分。

第一部分是我的申请联系人列表,第二部分是我的 phone 联系人列表。

像这样

有什么方法可以做到吗?

有人知道怎么做吗?

如果您已经有了 RecyclerView,实现这些部分的简单方法是使用 Gabriele Mariotti 的 SimpleSectionedRecyclerViewAdapter

我把他的例子贴给你:

//Your RecyclerView
mRecyclerView = (RecyclerView) findViewById(R.id.list);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.addItemDecoration(new DividerItemDecoration(this,LinearLayoutManager.VERTICAL));

//Your RecyclerView.Adapter
mAdapter = new SimpleAdapter(this,sCheeseStrings);


//This is the code to provide a sectioned list
List<SimpleSectionedRecyclerViewAdapter.Section> sections =
        new ArrayList<SimpleSectionedRecyclerViewAdapter.Section>();

//Sections
sections.add(new SimpleSectionedRecyclerViewAdapter.Section(0,"Section 1"));
sections.add(new SimpleSectionedRecyclerViewAdapter.Section(5,"Section 2"));
sections.add(new SimpleSectionedRecyclerViewAdapter.Section(12,"Section 3"));
sections.add(new SimpleSectionedRecyclerViewAdapter.Section(14,"Section 4"));
sections.add(new SimpleSectionedRecyclerViewAdapter.Section(20,"Section 5"));

//Add your adapter to the sectionAdapter
SimpleSectionedRecyclerViewAdapter.Section[] dummy = new SimpleSectionedRecyclerViewAdapter.Section[sections.size()];
SimpleSectionedRecyclerViewAdapter mSectionedAdapter = new
          SimpleSectionedRecyclerViewAdapter(this,R.layout.section,R.id.section_text,mAdapter);
mSectionedAdapter.setSections(sections.toArray(dummy));

//Apply this adapter to the RecyclerView
mRecyclerView.setAdapter(mSectionedAdapter);

如果您正在寻找不需要使用硬编码 header/row 索引的解决方案,您可以使用库 SectionedRecyclerViewAdapter.

首先创建一个部分 class 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 Sections 设置 RecyclerView:

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

// Create your sections with the list of data
MySection favoritesSection = new MySection("Favorites", favoritesList);
MySection contactsSection = new MySection("Add Favorites", contactsList);

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

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

您还可以向您的部分添加新行,而无需重新计算索引:

favoritesSection.addRow("new item");
sectionAdapter.notifyDataSetChanged();

Let me try to propose a native solution.

您必须有一个 联系人列表 并带有 isFavourite 标记

private class Contacts{
  private String name;
  private String phoneNumber;
  private boolean isFavourite;
}

根据 isFavourite 和 contactName 对该数组进行排序 like this

将该列表传递给您的 ContactRecyclerAdapter。并为页眉和项目使用两种不同的布局 like this

在你的适配器中 getItemViewType 像这样布局....

@Override
    public int getItemViewType(int position) {
        if (mCountriesModelList.get(position).isSection) {
            return SECTION_VIEW;
        } else {
            return CONTENT_VIEW;
        }
    }

https://github.com/sayanmanna/LetterSectionedRecyclerView

在 Github 上查看我的库,可用于轻松创建部分: RecyclerAdapter & Easy Section

mRecylerView.setLayoutManager(...);
/*create Adapter*/
RecyclerAdapter<Customer> baseAdapter = new RecyclerAdapter<>(...);
/*create sectioned adapter. the Adapter type can be RecyclerView.Adapter*/
SectionedAdapter<String, RecyclerAdapter> adapter = new SectionedAdapter<>(SectionViewHolder.class, baseAdapter);
/*add your sections*/
sectionAdapter.addSection(0/*position*/, "Title Section 1");
/*attach Adapter to RecyclerView*/
mRecylerView.setAdapter(sectionAdapter);

更新(2021 年 3 月)

ExpandableListView 不会提供 RecyclerView 提供的性能和内存优势。因此,我编写了自己的超轻量级库,其中分别在内置 RecyclerViewAdapterRecyclerView 之上分别包含自定义回收器适配器和自定义回收器视图(仅在需要网格布局时才需要)。该适配器公开了一些类似于 iOS table 视图工作方式的功能,因此在坚持您自己的代码设计的同时,可以非常轻松地实现分段回收器视图。详细说明可以在下面链接的项目 github 页面中找到。该依赖项可从 Maven Central 获得。

Sectioned RecyclerView

implementation 'com.github.harikrishnant1991:sectioned-recyclerview:1.0.0'

原答案

除了使用任何第三方库或使用自定义逻辑将 header 添加到 RecyclerView 之外,还有一个使用 Android SDK 的更简单的解决方案。您可以简单地使用 ExpandableListView。您可能认为它使列表可折叠,但有一个非常简单的事情可以避免同样的情况发生。在 ExpandableListView 的适配器 class 中,在 getGroupView 方法中,只需添加以下行:

(parent as ExpandableListView).expandGroup(groupPosition)

该方法看起来像这样:

override fun getGroupView(groupPosition: Int, isExpanded: Boolean, convertView: View?, parent: ViewGroup?): View {
    var view = convertView
    if (convertView == null) {
        val layoutInflater = context
            .getSystemService(LAYOUT_INFLATER_SERVICE) as LayoutInflater
        view = layoutInflater.inflate(R.layout.group_view, null)
    }
    /*
     Code to populate your data
     */

    // The following code will expand the group whenever the group view is inflated
    (parent as ExpandableListView).expandGroup(groupPosition)
    return view
}

这完全取决于 ExpandableListView 适配器的工作方式。每当您尝试折叠组 header 时,它都会调用 getGroupView 方法(以便您可以为 expanded/collapsed 状态膨胀不同的视图)。但是您在该方法中扩展了组,因此视图实际上永远不会折叠,有效地为您提供了一个分段列表外观。

除了上面提到的一行之外,所有其他部分都与您对普通行所做的完全相同ExpandableListView,因此您不需要进行额外的自定义。