以下是一个示例代码，演示了如何在Android中使用RecyclerView嵌套RecyclerView，并在滚动到底部时加载更多数据：

首先，在您的项目中添加RecyclerView依赖项。在build.gradle文件的dependencies块中添加以下代码：

implementation 'androidx.recyclerview:recyclerview:1.2.1'

接下来，创建两个布局文件：activity_main.xml和item_layout.xml。

activity_main.xml布局文件如下所示：

item_layout.xml布局文件如下所示：

接下来，创建两个适配器：ParentAdapter和ChildAdapter。ParentAdapter负责管理父RecyclerView，ChildAdapter负责管理子RecyclerView。

ParentAdapter.java代码如下所示：

public class ParentAdapter extends RecyclerView.Adapter {

    private List> data;

    public ParentAdapter(List> data) {
        this.data = data;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ParentViewHolder holder, int position) {
        List childData = data.get(position);
        ChildAdapter childAdapter = new ChildAdapter(childData);
        holder.childRecyclerView.setAdapter(childAdapter);
    }

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

    static class ParentViewHolder extends RecyclerView.ViewHolder {

        RecyclerView childRecyclerView;

        ParentViewHolder(@NonNull View itemView) {
            super(itemView);
            childRecyclerView = itemView.findViewById(R.id.childRecyclerView);
            LinearLayoutManager layoutManager = new LinearLayoutManager(itemView.getContext());
            childRecyclerView.setLayoutManager(layoutManager);
        }
    }
}

ChildAdapter.java代码如下所示：

public class ChildAdapter extends RecyclerView.Adapter {

    private List data;

    public ChildAdapter(List data) {
        this.data = data;
    }

    @NonNull
    @Override
    public ChildViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(android.R.layout.simple_list_item_1, parent, false);
        return new ChildViewHolder(view);
    }

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

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

    static class ChildViewHolder extends RecyclerView.ViewHolder {

        TextView textView;

        ChildViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(android.R.id.text1);
        }
    }
}

最后，在MainActivity.java中使用这些适配器来设置父RecyclerView：

public class MainActivity extends AppCompatActivity {

    private RecyclerView parentRecyclerView;
    private ParentAdapter parentAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        parentRecyclerView = findViewById(R.id.parentRecyclerView);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        parentRecyclerView.setLayoutManager(layoutManager);

        List> data = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            List childData = new ArrayList<>();
            for (int j = 0; j < 5; j++) {
                childData.add("Item " + j);
            }
            data.add(childData);
        }

        parentAdapter = new ParentAdapter(data);
        parentRecyclerView.setAdapter(parent