Question

我正在尝试将我的 List 食品订单中的项目添加到 recyclerView 中，但我总是遇到异常。下面是我的请求模型类代码：

<块引用>

Requests.java

public class Request {
    private String phone;
    private String name;
    private String address;
    private String total;
    private String status;
    private List<Order> foods;    // list of food order

    public Request() {
    }

    public Request(String phone, String name, String address, String total, List<Order> foods) {
        this.phone = phone;
        this.name = name;
        this.address = address;
        this.total = total;
        this.foods = foods;
        this.status = "0";    //Default is 0,0: Placed, 1:Shipping,2: Shipped
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getTotal() {
        return total;
    }

    public void setTotal(String total) {
        this.total = total;
    }

    public List<Order> getFoods() {
        return foods;
    }

    public void setFoods(List<Order> foods) {
        this.foods = foods;
    }
}

我将轻松地将列表中未包含的所有项目（例如姓名、电话、地址）放入 recyclerView 中...但无法从 List 订单食品中获取项目。下面是我的 OrderViewHolder 类代码：

<块引用>

OrderViewHolder.java

public class OrderViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{

    public TextView txtOrderId,txtOrderStatus,txtOrderPhone,txtOrderAddress,txtProductName,txtPrice,txtPersonname;

    private ItemClickListener itemClickListener;

    public OrderViewHolder(@NonNull View itemView)
    {
        super(itemView);
        txtOrderAddress = (TextView)itemView.findViewById(R.id.order_address);
        txtOrderId = (TextView)itemView.findViewById(R.id.order_id);
        txtOrderStatus = (TextView)itemView.findViewById(R.id.order_status);
        txtOrderPhone = (TextView)itemView.findViewById(R.id.order_phone);
        txtProductName=(TextView)itemView.findViewById(R.id.order_productname);
        txtPrice=(TextView)itemView.findViewById(R.id.order_price);
        txtPersonname= (TextView)itemView.findViewById(R.id.order_name);

        itemView.setOnClickListener(this);
    }

    public void setItemClickListener(ItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }

    @Override
    public void onClick(View v)
    {
        itemClickListener.onClick(v,getAdapterPosition(),false);
    }

}

在 populateViewHolder 中，我们将所有数据放入 recyclerView 除了订单食品列表中的这两行：

orderViewHolder.txtProductName.setText(request.getFoods().get(i).getProductName());
orderViewHolder.txtPrice.setText(request.getFoods().get(i).getPrice());

这里我们使用 get() 函数从 Model 类中获取我们的产品名称... 下面是我的 populateViewHolder 类代码：

private void loadOrders(String phone)
    {
        adapter = new FirebaseRecyclerAdapter<Request, OrderViewHolder>
                (
                Request.class,
                R.layout.order_layout,
                OrderViewHolder.class,
                requests.orderByChild("phone")
                        .equalTo(phone)
                )
        {
            @Override
            protected void populateViewHolder(OrderViewHolder orderViewHolder, Request request, int i)
            {
               orderViewHolder.txtOrderId.setText(adapter.getRef(i).getKey());
               orderViewHolder.txtOrderStatus.setText(convertCodeToStatus(request.getStatus()));
               orderViewHolder.txtOrderAddress.setText(request.getAddress());
               orderViewHolder.txtOrderPhone.setText(request.getPhone());
               orderViewHolder.txtProductName.setText(request.getFoods().get(i).getProductName());     //Here these two line shows up an error message to me
               orderViewHolder.txtPrice.setText(request.getFoods().get(i).getPrice());                //Here these two line shows up an error message to me
               orderViewHolder.txtPersonname.setText(request.getName());
            }
        };
        adapter.notifyDataSetChanged();
        recyclerView.setAdapter(adapter);
    }

以下是我的 order_layout 代码：

<块引用>

order_layout.xml

<androidx.cardview.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    app:cardElevation="4dp">

    <LinearLayout
        android:layout_marginTop="16dp"
        android:layout_marginBottom="16dp"
        android:orientation="horizontal"
        android:layout_gravity="center_vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <LinearLayout
            android:orientation="vertical"
            android:layout_weight="9"
            android:layout_width="0dp"
            android:layout_height="wrap_content">
            <TextView
                android:id="@+id/order_id"
                android:layout_marginLeft="10dp"
                android:gravity="center_vertical|start"
                android:textAllCaps="true"
                android:textStyle="bold"
                android:text="#111111"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
            <TextView
                android:id="@+id/order_status"
                android:layout_marginLeft="10dp"
                android:gravity="center_vertical|start"
                android:textAllCaps="true"
                android:textStyle="italic"
                android:text="Status"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
            <TextView
                android:id="@+id/order_phone"
                android:layout_marginLeft="10dp"
                android:gravity="center_vertical|start"
                android:textAllCaps="true"
                android:textStyle="italic"
                android:text="123456789"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
            <TextView
                android:id="@+id/order_name"
                android:layout_marginLeft="10dp"
                android:gravity="center_vertical|start"
                android:textAllCaps="true"
                android:textStyle="italic"
                android:text="Person Name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>


            <TextView
                android:id="@+id/order_address"
                android:layout_marginLeft="10dp"
                android:gravity="center_vertical|start"
                android:textAllCaps="true"
                android:textStyle="italic"
                android:text="Address"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
            <TextView
                android:id="@+id/order_productname"
                android:layout_marginLeft="10dp"
                android:gravity="center_vertical|start"
                android:textAllCaps="true"
                android:textStyle="italic"
                android:text="Product Name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
            <TextView
                android:id="@+id/order_price"
                android:layout_marginLeft="10dp"
                android:gravity="center_vertical|start"
                android:textAllCaps="true"
                android:textStyle="italic"
                android:text="Price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>

        </LinearLayout>
    </LinearLayout>

</androidx.cardview.widget.CardView>

这是我的数据库： enter image description here

Answer 1

错误在这一行 orderViewHolder.txtProductName.setText(request.getFoods().get(i).getProductName()); 那个“我”它是一个视图位置或项目在回收站视图中的位置看起来你有更多的请求项目然后列出食物包含

java.lang.IndexOutOfBoundsException: Index: 1, Size: 1 at java.util.ArrayList.get(ArrayList.java:437)

1 个答案: