以下是一个示例代码，展示了如何在Android中嵌套使用RecyclerView，并根据不同的项目进行计数。

1. 创建外部RecyclerView的布局文件，例如activity_main.xml：

2. 创建外部RecyclerView的项的布局文件，例如item_outer.xml：

3. 创建内部RecyclerView的项的布局文件，例如item_inner.xml：

4. 创建外部RecyclerView的适配器OuterAdapter.java：

public class OuterAdapter extends RecyclerView.Adapter {
    private List outerItems;

    public OuterAdapter(List outerItems) {
        this.outerItems = outerItems;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        OuterItem outerItem = outerItems.get(position);
        holder.outerTextView.setText(outerItem.getTitle());

        InnerAdapter innerAdapter = new InnerAdapter(outerItem.getInnerItems());
        holder.innerRecyclerView.setAdapter(innerAdapter);
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView outerTextView;
        RecyclerView innerRecyclerView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            outerTextView = itemView.findViewById(R.id.outerTextView);
            innerRecyclerView = itemView.findViewById(R.id.innerRecyclerView);
        }
    }
}

5. 创建内部RecyclerView的适配器InnerAdapter.java：

public class InnerAdapter extends RecyclerView.Adapter {
    private List innerItems;

    public InnerAdapter(List innerItems) {
        this.innerItems = innerItems;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        InnerItem innerItem = innerItems.get(position);
        holder.innerTextView.setText(innerItem.getName());
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView innerTextView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            innerTextView = itemView.findViewById(R.id.innerTextView);
        }
    }
}

6. 创建数据模型类OuterItem.java和InnerItem.java，并在OuterItem中添加计数值：

public class OuterItem {
    private String title;
    private List innerItems;
    private int count;

    public OuterItem(String title, List innerItems) {
        this.title = title;
        this.innerItems = innerItems;
        this.count = innerItems.size();
    }

    public String getTitle() {
        return title;
    }

    public List getInnerItems() {
        return innerItems;
    }

    public int getCount() {
        return count;
    }
}

public class InnerItem {
    private String name;

    public InnerItem(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

7. 在MainActivity.java中设置外部RecyclerView的适配器：

public class MainActivity extends AppCompatActivity {
    private RecyclerView outerRecyclerView;
    private OuterAdapter outerAdapter;

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

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

        List outerItems = generateOuterItems();
        outerAdapter = new OuterAdapter(outerItems);
        outer