使用CardView时，我的RecyclerView上无法显示来自Firebase的数据

// 引入Firebase数据库和RecyclerView相关的库
implementation 'com.google.firebase:firebase-database:20.0.0'
implementation 'androidx.recyclerview:recyclerview:1.2.1'
implementation 'androidx.cardview:cardview:1.0.0'

// 在布局文件中添加RecyclerView和CardView
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

// 创建一个CardView的布局文件，例如card_item.xml
<androidx.cardview.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp">

    <!-- 在CardView中添加需要展示的数据项 -->
    <TextView
        android:id="@+id/titleTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:textColor="#000000" />

    <TextView
        android:id="@+id/descriptionTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        android:textColor="#666666" />

</androidx.cardview.widget.CardView>

// 在代码中获取RecyclerView和Firebase数据
RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));

FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference dataRef = database.getReference("your_data_path");

FirebaseRecyclerOptions<DataModel> options = new FirebaseRecyclerOptions.Builder<DataModel>()
        .setQuery(dataRef, DataModel.class)
        .build();

FirebaseRecyclerAdapter<DataModel, DataViewHolder> adapter = new FirebaseRecyclerAdapter<DataModel, DataViewHolder>(options) {
    @Override
    protected void onBindViewHolder(@NonNull DataViewHolder holder, int position, @NonNull DataModel model) {
        holder.titleTextView.setText(model.getTitle());
        holder.descriptionTextView.setText(model.getDescription());
    }

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

recyclerView.setAdapter(adapter);
adapter.startListening();

// 创建一个ViewHolder来绑定CardView中的视图
public class DataViewHolder extends RecyclerView.ViewHolder {
    TextView titleTextView;
    TextView descriptionTextView;

    public DataViewHolder(@NonNull View itemView) {
        super(itemView);
        titleTextView = itemView.findViewById(R.id.titleTextView);
        descriptionTextView = itemView.findViewById(R.id.descriptionTextView);
    }
}