android - 如何在 RecyclerView 中显示来自 Cloud FireStore 的对象数组

Question

我正在尝试将存储在 Cloud Firestore 中的数据显示到 RecyclerView，但是当我 运行 应用程序时，它只显示 itemList 以外的所有数据 map正在显示

我没有收到任何错误，所以它导致我遇到瓶颈

我的适配器代码

    Context context;
    List<ViewOrderModel> viewOrderModelList;

    public ViewOrderAdapter(Context context, List<ViewOrderModel> viewOrderModelList) {
        this.context = context;
        this.viewOrderModelList = viewOrderModelList;
    }

   @Override
    public void onBindViewHolder(@NonNull ViewOrderAdapter.ViewHolder holder, int position) {

        holder.userName.setText(viewOrderModelList.get(position).getUserName());
        holder.date.setText(viewOrderModelList.get(position).getCurrentTime());
        holder.totalPrice.setText(String.valueOf(viewOrderModelList.get(position).getTotalPrice()));
        holder.address.setText(viewOrderModelList.get(position).getAddress());
        holder.phone.setText(viewOrderModelList.get(position).getPhoneNumber());

        ViewOrderModel viewOrderModel = viewOrderModelList.get(position);
        holder.productName.setText(viewOrderModel.getProductName());
        holder.quantity.setText(String.valueOf(viewOrderModel.getTotalQuantity()));

    }

型号Class

public class ViewOrderModel implements Serializable {

    String userName,phoneNumber,currentTime,address,documentID,productName;
    long totalPrice;
    List<ViewOrderModel> itemList;
    int totalQuantity;

主要Activity

        order_rec = findViewById(R.id.admin_view_order_rec);
        order_rec.setLayoutManager(new LinearLayoutManager(this,RecyclerView.VERTICAL,false));
        viewOrderModelList = new ArrayList<>();
        viewOrderAdapter = new ViewOrderAdapter(this,viewOrderModelList);
        order_rec.setAdapter(viewOrderAdapter);
        firestore.collection("UserOrder")
                .get()
                .addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
                    @Override
                    public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
                        if (!queryDocumentSnapshots.isEmpty()){
                            List<DocumentSnapshot> list = queryDocumentSnapshots.getDocuments();
                            for (DocumentSnapshot docSnap : list) {
                                ViewOrderModel orderModel = docSnap.toObject(ViewOrderModel.class);
                                viewOrderModelList.add(orderModel);
                            }
                            viewOrderAdapter.notifyDataSetChanged();
                        }
                    }
                });

有没有办法显示数据或任何其他与我在代码中所做的不同的方式

Answer 1

您需要两个不同的 class。例如，第一个是 ViewOrderModel class，它将包含 address、currentTime、documentID 等字段。

第二个叫 Product:

class Product {
    String documentID, productName;
    int productPrice, totalPrice, totalQuantity;
}

其中将保存与 itemList 中存在的对象对应的属性。所以你的 ViewOrderModel class 应该是这样的：

public class ViewOrderModel implements Serializable {
    String userName,phoneNumber,currentTime,address,documentID,productName;
    List<Product> itemList;
            
}