java - 将行添加到 recyclerView 中的部分

Question

我在该 recyclerView 中有一个 RecyclerView，我添加了两个部分 Collection 夹、所有联系人。为了添加我使用的部分 SimpleSectionedRecyclerViewAdapter 现在我有一些行的部分是硬编码的(行和部分的索引)，我想通过选择行将行添加到 favorite 部分，因为没有任何关于我想要的内容的记录，我不知道从哪里开始或我必须做什么？

如果有人知道如何通过选择它们来从 All Contacts 部分(这是 rows 的默认位置)添加行。那么请给我一些关于我必须做什么的提示

我想要的是这样的:

按按钮添加到 Collection 夹

任何指导都会对我很有帮助，谢谢

Answer 1

您可以使用库 SectionedRecyclerViewAdapter 来实现它无需对标题/行索引进行硬编码。

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);
    }
}

然后用您的部分设置 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);

您可以找到如何监听按钮点击 here 的示例.

您还可以向部分添加新行，而无需重新计算索引，只需在部分类中创建如下方法即可:

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

然后:

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