ListView 中的最后一项返回 OutOfBoundsException

Question

我有一个旧应用程序，其中列表视图中的每个项目中都有一个删除按钮。我遵循了它在我最近的应用程序中使用的格式，但每当我尝试删除列表视图中的最后一项时，它都会给我OutOfBoundsException: Invalid index 4, size 4。

在以下情况下会发生此错误：

• 我尝试删除列表中的最后一项
  • 我尝试删除列表中唯一的项目

以下是我从列表中删除该项目的方法：

Cart_Adapter：

productHolder.item_delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
cart_list.remove(getItem(position));
notifyDataSetChanged();

我尝试过但都失败了：

• remove(getItem(position));带和不带通知数据集已更改
• remove(cart_list.get(position));带和不带通知数据集已更改
• cart_list.remove(getItem(position));
• cart_list.remove(position);

编辑： 完整的适配器类

package dagger.com.japorms.adapter;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import dagger.com.japorms.R;
import dagger.com.japorms.fragment.Cart_Fragment;
import dagger.com.japorms.main.User_Activity;
import dagger.com.japorms.model.Cart_List;
import dagger.com.japorms.model.Cart_Model;
import dagger.com.japorms.model.Order;
import dagger.com.japorms.model.Pending_Items_Model;
import dagger.com.japorms.model.Product_List;
import dagger.com.japorms.other.HttpConstants;
import dagger.com.japorms.service.APIService;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import static dagger.com.japorms.other.HttpConstants.BASE_URL;
import static dagger.com.japorms.other.HttpConstants.HTTP_PRODUCT_IMAGE;
/**
* Created by Claude on 06/07/2017.
*/
public class Cart_Adapter extends ArrayAdapter<Cart_List> {
Context context;
int layoutResourceId;
ArrayList<Cart_List> cart_list = new ArrayList<>();
DecimalFormat formatter = new DecimalFormat("#,###,###.00");
int item_list;
int temp;
Double total_amount =0.00d;
public Cart_Adapter(Context context, int layoutResourceId, ArrayList<Cart_List> cart_list) {
super(context,layoutResourceId,cart_list);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.cart_list = cart_list;
}
@NonNull
@Override
public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View row = convertView;
ProductHolder productHolder;
if(row == null) {
LayoutInflater inflater = ((Activity) getContext()).getLayoutInflater();
row = inflater.inflate(layoutResourceId,parent,false);
productHolder = new ProductHolder();
productHolder.item_img = (ImageView) row.findViewById(R.id.item_cart_img);
productHolder.item_name = (TextView) row.findViewById(R.id.item_cart_name);
productHolder.item_price = (TextView) row.findViewById(R.id.item_cart_price);
productHolder.item_qty = (TextView) row.findViewById(R.id.item_cart_qty);
productHolder.item_size = (TextView) row.findViewById(R.id.item_cart_size);
productHolder.item_modify = (TextView) row.findViewById(R.id.item_cart_modify);
productHolder.item_delete = (TextView) row.findViewById(R.id.item_cart_remove);

row.setTag(productHolder);

}
else
productHolder = (ProductHolder) row.getTag();

productHolder.item_name.setText("Name: "+cart_list.get(position).getItemName());
productHolder.item_price.setText("Price: PHP " + formatter.format(Double.parseDouble(cart_list.get(position).getItemPrice())));
productHolder.item_qty.setText("Quantity: "+cart_list.get(position).getItemQty());
productHolder.item_size.setText("Size: "+cart_list.get(position).getSize());
Picasso.with(context).load(BASE_URL + HTTP_PRODUCT_IMAGE + cart_list.get(position).getCategory() + "/" +
cart_list.get(position).getItemId() + ".jpg").into(productHolder.item_img);


productHolder.item_delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

cart_list.remove(getItem(position));
notifyDataSetChanged();
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(HttpConstants.BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
APIService service = retrofit.create(APIService.class);

Call<Pending_Items_Model> call = service.deletePendingItem( cart_list.get(position).getItemId());
call.enqueue(new Callback<Pending_Items_Model>() {
@Override
public void onResponse(Call<Pending_Items_Model> call, Response<Pending_Items_Model> response) {
((User_Activity) context).CheckCart();
}
@Override
public void onFailure(Call<Pending_Items_Model> call, Throwable t) {
}
});
}
});

return row;

}


static class ProductHolder{
ImageView item_img;
TextView item_name;
TextView item_price;
TextView item_qty;
TextView item_size;
TextView item_modify;
TextView item_delete;
}
}

Answer 1

我认为问题是由使用以下两行引起的： cart_list.remove(getItem(position)); ... Call<Pending_Items_Model> call = service.deletePendingItem(cart_list.get(position).getItemId());

通知 set 无济于事，因为您正在尝试使用相同的方法将项目放在刚刚删除的位置上。如果你想获得该项目，我建议重构为：

Cart_List removedCartcart_list.remove(getItem(position)); ... Call<Pending_Items_Model> call = service.deletePendingItem(removedCart.getItemId());