Android 中 RecyclerView 3级嵌套例程

RecyclerView 的三级嵌套可以使用多个 RecyclerView 来实现，每个 RecyclerView 对应一个嵌套的层级。

示例代码如下：

1. 定义三个 RecyclerView，分别对应三级嵌套的层级。

private RecyclerView recyclerView1;
private RecyclerView recyclerView2;
private RecyclerView recyclerView3;

2. 初始化 RecyclerView，设置布局管理器和适配器。

recyclerView1 = findViewById(R.id.recyclerView1);
recyclerView1.setLayoutManager(new LinearLayoutManager(this));
recyclerView1.setAdapter(new MyAdapter1());

recyclerView2 = findViewById(R.id.recyclerView2);
recyclerView2.setLayoutManager(new LinearLayoutManager(this));
recyclerView2.setAdapter(new MyAdapter2());

recyclerView3 = findViewById(R.id.recyclerView3);
recyclerView3.setLayoutManager(new LinearLayoutManager(this));
recyclerView3.setAdapter(new MyAdapter3());

3. 实现每个 RecyclerView 的适配器。

private class MyAdapter1 extends RecyclerView.Adapter<MyViewHolder1> {
    @NonNull
    @Override
    public MyViewHolder1 onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_level1, parent, false);
        return new MyViewHolder1(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder1 holder, int position) {
        // 绑定数据
    }

    @Override
    public int getItemCount() {
        return 10;
    }
}

private class MyViewHolder1 extends RecyclerView.ViewHolder {
    public MyViewHolder1(@NonNull View itemView) {
        super(itemView);
    }
}

private class MyAdapter2 extends RecyclerView.Adapter<MyViewHolder2> {
    @NonNull
    @Override
    public MyViewHolder2 onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_level2, parent, false);
        return new MyViewHolder2(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder2 holder, int position) {
        // 绑定数据
    }

    @Override
    public int getItemCount() {
        return 5;
    }
}

private class MyViewHolder2 extends RecyclerView.ViewHolder {
    public MyViewHolder2(@NonNull View itemView) {
        super(itemView);
    }
}

private class MyAdapter3 extends RecyclerView.Adapter<MyViewHolder3> {
    @NonNull
    @Override
    public MyViewHolder3 onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_level3, parent, false);
        return new MyViewHolder3(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder3 holder, int position) {
        // 绑定数据
    }

    @Override
    public int getItemCount() {
        return 3;
    }
}

private class MyViewHolder3 extends RecyclerView.ViewHolder {
    public MyViewHolder3(@NonNull View itemView) {
        super(itemView);
    }
}

4. 在前一个 RecyclerView 的适配器中，给每个 item 添加点击事件，根据点击的位置切换到下一个 RecyclerView。

private class MyAdapter1 extends RecyclerView.Adapter<MyViewHolder1> {
    ...

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder1 holder, int position) {
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                recyclerView1.setVisibility(View.GONE);
                recyclerView2.setVisibility(View.VISIBLE);
            }
        });
    }
}

private class MyAdapter2 extends RecyclerView.Adapter<MyViewHolder2> {
    ...

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder2 holder, int position) {
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                recyclerView2.setVisibility(View.GONE);
                recyclerView3.setVisibility(View.VISIBLE);
            }
        });
    }
}

private class MyAdapter3 extends RecyclerView.Adapter<MyViewHolder3> {
    ...

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder3 holder, int position) {
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 最后一级嵌套，不需要切换到下一个 RecyclerView
            }
        });
    }
}

以上示例代码仅供参考，具体实现需要根据项目需求进行调整。