RecyclerView具有Section Header的项目(动态更新任何位置的元素)

Question

我想显示一个带有节头的RecyclerView。我指的是这个例子https://gist.github.com/gabrielemariotti/4c189fb1124df4556058，这很好用。但我想在任何位置插入或删除元素（带或不带节头）。我已经尝试了一些方法来扩展上面的代码。但没有找到任何最佳解决方案。有人解决了这个问题吗？提前感谢

Answer 1

您可以使用库SectionedRecyclerViewAdapter:

1） 添加渐变依赖项：

dependencies {
    compile 'io.github.luizgrp.sectionedrecyclerviewadapter:sectionedrecyclerviewadapter:1.+'
}

2） 创建自定义Section类：

class MySection extends StatelessSection {
    ArrayList<String> myList = new ArrayList<>(10);
    public MySection() {
        // call constructor with layout resources for this Section header and items 
        super(R.layout.section_header, R.layout.section_item);
    }
    public void addItem(int position, String item) {
        myList.add(position, item);
    }
    public void removeItem(int position) {
        myList.remove(position);
    }
    @Override
    public int getContentItemsTotal() {
        return myList.size();
    }
    @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(myList.get(position));
    }
}

3） 为项目创建自定义ViewHolder：

class MyItemViewHolder extends RecyclerView.ViewHolder {
    private final TextView tvItem;
    public MyItemViewHolder(View itemView) {
        super(itemView);
        tvItem = (TextView) itemView.findViewById(R.id.tvItem);
    }
}

4） 使用SectionedRecyclerViewAdapter设置RecyclerView

// Create an instance of SectionedRecyclerViewAdapter 
SectionedRecyclerViewAdapter sectionAdapter = new SectionedRecyclerViewAdapter();
MySection mySection = new MySection();
// Add your Sections
sectionAdapter.addSection(mySection);
// Set up your RecyclerView with the SectionedRecyclerViewAdapter
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setAdapter(sectionAdapter);

5） 在节中添加/删除您的项目：

mySection.addItem(1, "Item 1");
mySection.remove(0);
sectionAdapter.notifyDataSetChanged();