Question

我正在我的应用中实现购物车。产品使用RecyclerView显示，用户输入数量EditText。看起来像这样：

截屏

问题：
现在我有13个产品。假设我输入数量为1.0,2.5,3.5，就产品2,3和4而言，然后我向下滚动到最后并返回到屏幕的开头，数量设置为1.0,2.5,3.5,1.0,2.5和产品2,3,4,11,12,13分别为3.5。

我已经搜索了很多关于SO的类似问题，但到目前为止没有任何帮助。请帮忙。

我的代码是：

package com.organicbasket.retailer_app.adapter;

import android.content.Context;
import android.graphics.Point;
import android.support.v7.widget.RecyclerView;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.organicbasket.retailer_app.R;
import com.organicbasket.retailer_app.fragment.ProductListFragment;
import com.organicbasket.retailer_app.model.Product;
import com.organicbasket.retailer_app.society.ShoppingActivity;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;

import static android.text.TextUtils.isEmpty;

public class ProductListAdapter extends RecyclerView.Adapter<ProductListAdapter.ProductViewHolder> {
    private ShoppingActivity shoppingActivity;
    private final Context context;
    private ProductListFragment productListFragment;
    private ArrayList<Product> productItems;

    public ProductListAdapter(ShoppingActivity activity, List<Product> productItems, ProductListFragment productListFragment) {
        this.context = activity.getApplicationContext();
        this.shoppingActivity = activity;
        this.productListFragment = productListFragment;
        this.productItems = new ArrayList<>();
        this.productItems.addAll(productItems);
    }

    public class ProductViewHolder extends RecyclerView.ViewHolder{
        ImageView thumbNail;
        TextView name;
        TextView rate;
        EditText etQuantity;
        TextView remarks;
        Button addToCart;

        public ProductViewHolder(View itemView) {
            super(itemView);
            name = (TextView) itemView.findViewById(R.id.product_name);
            rate = (TextView) itemView.findViewById(R.id.rate);
            etQuantity = (EditText) itemView.findViewById(R.id.quantity);
            remarks = (TextView) itemView.findViewById(R.id.remarks);
            thumbNail = (ImageView) itemView.findViewById(R.id.thumbnail);
            addToCart = (Button) itemView.findViewById(R.id.addtocart);
        }

    }

    @Override
    public ProductViewHolder onCreateViewHolder(ViewGroup viewGroup, final int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.productlist_row, viewGroup, false);
        ProductViewHolder viewHolder = new ProductViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ProductViewHolder viewHolder, final int position) {
        Product currentProduct;
        currentProduct = productItems.get(position);

        viewHolder.etQuantity.setText(Double.toString(productItems.get(position).getItemQuantity()));

        viewHolder.name.setText(currentProduct.getName());
        NumberFormat nf = new DecimalFormat("##.###");
        viewHolder.rate.setText("Rs " + String.valueOf(currentProduct.getRate()) + " per " + nf.format(currentProduct.getQuantity()) + " " + String.valueOf(currentProduct.getUnit()));
        viewHolder.remarks.setText(String.valueOf(currentProduct.getRemarks()));

        viewHolder.etQuantity.addTextChangedListener(new TextWatcher() {
                 @Override
                 public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

                 @Override
                 public void onTextChanged(CharSequence s, int start, int before, int count) {}

                 @Override
                 public void afterTextChanged(Editable s) {
                     double value = 0.0;

                     if(shoppingActivity.productList.size() <= 0){
                         return;
                     }

                     if (isEmpty(s.toString())){
                         for (int i = 0; i < shoppingActivity.myCart.productList.size(); i++) {
                             if (Integer.toString(productItems.get(position).getID()).equals(Integer.toString(shoppingActivity.myCart.productList.get(i).getID()))) {
                                 shoppingActivity.myCart.productList.remove(i);
                                 break;
                             }
                         }
                         for (int i = 0; i < shoppingActivity.productList.size(); i++) {
                             if (Integer.toString(productItems.get(position).getID()).equals(Integer.toString(shoppingActivity.productList.get(i).getID()))) {
                                 shoppingActivity.productList.get(i).setItemQuantity(0);
                                 break;
                             }
                         }

                         viewHolder.addToCart.setVisibility(View.GONE);
                         Toast.makeText(shoppingActivity, "Removed from Cart", Toast.LENGTH_SHORT).show();
                         return;
                     }

                     try {
                         value = Double.parseDouble(s.toString());
                         if(value <= 0) {
                             viewHolder.addToCart.setVisibility(View.GONE);
                             return;
                         }

                         if (viewHolder.addToCart.getVisibility() == View.VISIBLE) {
                             for (int i = 0; i < shoppingActivity.productList.size(); i++) {
                                 if (Integer.toString(productItems.get(position).getID()).equals(Integer.toString(shoppingActivity.productList.get(i).getID()))) {
                                     shoppingActivity.productList.get(i).setItemQuantity(value);
                                     break;
                                 }
                             }

                             for (int i = 0; i < shoppingActivity.myCart.productList.size(); i++) {
                                 if (Integer.toString(productItems.get(position).getID()).equals(Integer.toString(shoppingActivity.myCart.productList.get(i).getID()))) {
                                     shoppingActivity.myCart.productList.get(i).setItemQuantity(value);
                                     break;
                                 }
                             }

                         } else {
                             shoppingActivity.myCart.productList.add(productItems.get(position));
                             for (int i = 0; i < shoppingActivity.productList.size(); i++) {
                                 if (Integer.toString(productItems.get(position).getID()).equals(Integer.toString(shoppingActivity.productList.get(i).getID()))) {
                                     shoppingActivity.productList.get(i).setItemQuantity(value);
                                     break;
                                 }
                             }
                             viewHolder.addToCart.setVisibility(View.VISIBLE);
                             viewHolder.addToCart.setText("REMOVE");
                             viewHolder.addToCart.setBackground(shoppingActivity.getResources().getDrawable(R.drawable.round_button_purple));
                             viewHolder.addToCart.setTextColor(shoppingActivity.getResources().getColor(R.color.white));

                         }
                     }
                     catch (Exception e){

                     }

                 }
             }
        );

    }

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

    @Override
    public long getItemId(int position) {
        return position;
    }

}

Answer 1

试试这个： -

只需在viewHolder.setIsRecyclable(false);

中添加onBindViewHolder即可

Answer 2

只需在适配器类中添加以下代码行即可实现结果，

@Override
public int getItemViewType(int position) {
    return position;
}

Android RecycleView EditText更新错误的行

2 个答案: