从Activity获取RecyclerView中的CardView

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

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

// 创建适配器并设置给RecyclerView
MyAdapter adapter = new MyAdapter(dataList);
recyclerView.setAdapter(adapter);

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<Data> dataList;

    public MyAdapter(List<Data> dataList) {
        this.dataList = dataList;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        // 绑定数据到ViewHolder中的CardView
        Data data = dataList.get(position);
        holder.cardView.setTitle(data.getTitle());
        holder.cardView.setDescription(data.getDescription());
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {
        CardView cardView;

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