RecyclerView嵌套RecyclerView，如何设置两个RecyclerView的Adapter适配器

RecyclerView嵌套RecyclerView主要是通过在父RecyclerView的Adapter中，将子RecyclerView作为一个item来展示。而子RecyclerView的Adapter则需要在父RecyclerView的Adapter中进行设置。

具体实现过程可以分为以下几个步骤：

1. 在父RecyclerView的Adapter中，创建一个ViewHolder来显示子RecyclerView，并通过findViewById()方法获取到子RecyclerView的引用。

2. 创建一个子RecyclerView的LayoutManager，并为子RecyclerView设置该LayoutManager。

3. 创建一个子RecyclerView的Adapter，用于展示子RecyclerView的数据。

4. 将子RecyclerView的Adapter设置到子RecyclerView中。

5. 在父RecyclerView的Adapter中，重写getItemCount()方法，返回父RecyclerView的item数量。

6. 在父RecyclerView的Adapter中，重写onBindViewHolder()方法，通过position获取到当前item对应的数据，并为子RecyclerView设置数据适配器。

下面是一个示例代码：

public class ParentAdapter extends RecyclerView.Adapter<ParentAdapter.ParentViewHolder> {

    private List<List<String>> mData;

    public ParentAdapter(List<List<String>> data) {
        mData = data;
    }

    @Override
    public ParentViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_parent, parent, false);
        return new ParentViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(ParentViewHolder holder, int position) {
        List<String> childData = mData.get(position);
        ChildAdapter childAdapter = new ChildAdapter(childData);
        holder.mChildRecyclerView.setAdapter(childAdapter);
    }

    @Override
    public int getItemCount() {
        return mData.size();
    }

    static class ParentViewHolder extends RecyclerView.ViewHolder {

        RecyclerView mChildRecyclerView;

        ParentViewHolder(View itemView) {
            super(itemView);
            mChildRecyclerView = itemView.findViewById(R.id.child_recycler_view);
            LinearLayoutManager layoutManager = new LinearLayoutManager(itemView.getContext());
            mChildRecyclerView.setLayoutManager(layoutManager);
        }
    }
}

public class ChildAdapter extends RecyclerView.Adapter<ChildAdapter.ChildViewHolder> {

    private List<String> mData;

    public ChildAdapter(List<String> data) {
        mData = data;
    }

    @Override
    public ChildViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_child, parent, false);
        return new ChildViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(ChildViewHolder holder, int position) {
        String data = mData.get(position);
        holder.mTextView.setText(data);
    }

    @Override
    public int getItemCount() {
        return mData.size();
    }

    static class ChildViewHolder extends RecyclerView.ViewHolder {

        TextView mTextView;

        ChildViewHolder(View itemView) {
            super(itemView);
            mTextView = itemView.findViewById(R.id.text_view);
        }
    }
}