问如何使用header在recyclerview中创建组项目
EN

Stack Overflow用户

提问于 2016-03-21 10:19:47

回答 1查看 6.8K关注 0票数 2

我想在recyclerview中设置组头，这意味着我有一个包含json对象的api，它包含基于课程的json对象例如Lesson1包含超过3个项目第二课包含4个项目，我已经从api中得到了响应，并像这样显示在recyclerview中。

Lesson 1:
Lesson 1:Random Numbers
Lesson 1:Complex Numbers
Lesson 1:Matrix

Lesson 2:
Lesson 2:Algebra
Lesson 2:Differentiation
Lesson 2:Integration

就像这样，我在recyclerview .I中显示了我想要的组标题显示像这样

Lesson 1:
Random Numbers
Complex Numbers
Matrix

Lesson 2:
Algebra
Differentiation
Integration

想要设置标题和分组的项目，请帮助我朋友

android

人脸核身产品特惠

用户政务民生、金融、通信运营商等场景，接入全面，安全可靠新用户3折起

回答 1

Stack Overflow用户

发布于 2016-03-31 16:04:10

使用库SectionedRecyclerViewAdapter，您可以按部分对项目进行分组，并为每个部分添加一个标题：

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_footer,  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);
    }
}

然后使用您的部分设置RecyclerView：

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

MySection lesson1Section = new MySection("Lesson 1", lesson1List);
MySection lesson2Section = new MySection("Lesson 2", lesson2List);

// Add your Sections
sectionAdapter.addSection(lesson1Section);
sectionAdapter.addSection(lesson2Section);

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