动态的ListView滚动的TextView自动改变 [英] Dynamic ListView scroll TextView changed automatically

问题描述

当我点击+按键增加的价格，然后单击 - 按钮减小它的工作完美的价格，但是当我滚动的ListView tvPrices的（TextView的）的值改变

我应该为住宿价格增量怎么办？

这里是我的适配器

 公共类ListAdapter延伸BaseAdapter { 公众的ArrayList＆LT;整数GT;量=新的ArrayList＆LT;整数GT;（）;
 公众的ArrayList＆LT;整数GT;价格=新的ArrayList＆LT;整数GT;（）;
 私有String [] listViewItems，价格，static_price;
 TypedArray图像;
 查看排= NULL; 静态字符串get_price，get_quntity;
 INT g_quntity，g_price，g_minus; 私人上下文的背景下;
 CustomButtonListener customButtonListener; 静态HashMap的＆LT;字符串，字符串＆GT;地图=新的HashMap＆LT;＆GT;（）;
 公共ListAdapter（上下文的背景下，字符串[] listViewItems，TypedArray图像的String []价格）{
  this.context =背景;
  this.listViewItems = listViewItems;
  this.images =图像;
  this.prices =价格;  的for（int i = 0; I＆LT; listViewItems.length;我++）{
   quantity.add（0）;
   price.add（0）;
  }
 } 公共无效setCustomButtonListener（CustomButtonListener customButtonListner）{
  this.customButtonListener = customButtonListner;
 } @覆盖
 公众诠释的getCount（）{
  返回listViewItems.length;
 } @覆盖
 公共字符串的getItem（INT位置）{
  返回listViewItems [位置]
 }
 @覆盖
 众长getItemId（INT位置）{
  返回0;
 } @覆盖
 公共查看getView（最终诠释的立场，观点convertView，父母的ViewGroup）{  最后ListViewHolder listViewHolder;
  如果（convertView == NULL）{
   LayoutInflater layoutInflater =（LayoutInflater）context.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
   行= layoutInflater.inflate（R.layout.activity_custom_listview，父母，假）;
   listViewHolder =新ListViewHolder（）;
   listViewHolder.tvProductName =（TextView中）row.findViewById（R.id.tvProductName）;
   listViewHolder.ivProduct =（ImageView的）row.findViewById（R.id.ivproduct）;
   listViewHolder.tvPrices =（TextView中）row.findViewById（R.id.tvProductPrice）;
   listViewHolder.btnPlus =（的ImageButton）row.findViewById（R.id.ib_addnew）;
   listViewHolder.edTextQuantity =（EditText上）row.findViewById（R.id.editTextQuantity）;
   listViewHolder.btnMinus =（的ImageButton）row.findViewById（R.id.ib_remove）;
   static_price = context.getResources（）getStringArray（R.array.Price）。
   row.setTag（listViewHolder）;
  }其他{
   排= convertView;
   listViewHolder =（ListViewHolder）convertView.getTag（）;
  }
  listViewHolder.ivProduct.setImageResource（images.getResourceId（位置，-1））;
  尝试{   listViewHolder.edTextQuantity.setText（quantity.get（位置）+）;  }赶上（例外五）{
   e.printStackTrace（）;
  }  listViewHolder.btnPlus.setOnClickListener（新View.OnClickListener（）{   @覆盖
   公共无效的onClick（视图v）{
    如果（customButtonListener！= NULL）{
     customButtonListener.onButtonClickListener（位置，listViewHolder.edTextQuantity，1）;     quantity.set（位置，quantity.get（位置）+ 1）;
     price.set（位置，price.get（位置）+ 1）;     row.getTag（位置）;     。get_price = listViewHolder.tvPrices.getText（）的toString（）;     g_price = Integer.valueOf（static_price [位置]）;     。get_quntity = listViewHolder.edTextQuantity.getText（）的toString（）;
     g_quntity = Integer.valueOf（get_quntity）;     map.put（+ listViewHolder.tvProductName.getText（）的toString（），+ listViewHolder.edTextQuantity.getText（）的toString（））;
     listViewHolder.tvPrices.setText（+ g_price * g_quntity）;
// Log.d（A，+一）;
// Toast.makeText（背景下，A+ A，Toast.LENGTH_LONG）.show（）;
// Log.d（位置，+位置）;
//的System.out.println（+位置+值+ map.values​​（））;
     ShowHashMapValue（）;
     listViewHolder.tvPrices.setText（+ g_price * g_quntity）;
    }
   }  }）;
  listViewHolder.btnMinus.setOnClickListener（新View.OnClickListener（）{
   @覆盖
   公共无效的onClick（视图v）{
    如果（customButtonListener！= NULL）{
     customButtonListener.onButtonClickListener（位置，listViewHolder.edTextQuantity，-1）;
     如果（quantity.get（位置）大于0）
      quantity.set（位置，quantity.get（位置） -  1）;     。get_price = listViewHolder.tvPrices.getText（）的toString（）;
     g_minus = Integer.valueOf（get_price）;
     g_price = Integer.valueOf（static_price [位置]）;
     INT减= g_minus  -  g_price;
     如果（减去＆GT; = g_price）{
      listViewHolder.tvPrices.setText（+负）;
     }     map.put（+ listViewHolder.tvProductName.getText（）的toString（），+ listViewHolder.edTextQuantity.getText（）的toString（））;
     ShowHashMapValue（）;
    }
   }
  }）;
  listViewHolder.tvProductName.setText（listViewItems [位置]）;
  listViewHolder.tvPrices.setText（价格[位置]）;  返回行;
 } 私人无效ShowHashMapValue（）{  / **
   *获取一组从HashMap的键
   * /
  设置setOfKeys = map.keySet（）;/ **
 *获得设置迭代器实例
 * /
  迭代器迭代器= setOfKeys.iterator（）;/ **
 *循环迭代，直到我们达到HashMap中的最后一个元素
 * /
  而（iterator.hasNext（））{
/ **
 * next（）方法返回的迭代器实例中的下一个关键。
 * next（）方法的返回类型为对象，所以我们需要做的向下转换为字符串
 * /
   字符串键=（字符串）iterator.next（）;/ **
 *一旦我们知道了钥匙，我们可以从HashMap中获得的价值
 *通过调用get（）方法
 * /
   字符串值= map.get（键）;   的System.out.println（键+按键+，值：+值）;
  }
 }
}
 

解决方案

在的onclick，你递减后的值调用notifyDataSetChanged（）

notifyDataSetChanged

但其昂贵的操作，因为它刷新完整列表

when i click + button increment the price and click - button decrease the price it's work perfectly but when i scroll listview the value of tvPrices (TextView) is changed.

What should i do for the stay increment price?

here is my adapter

 public class ListAdapter extends BaseAdapter {

 public ArrayList<Integer> quantity = new ArrayList<Integer>();
 public ArrayList<Integer> price = new ArrayList<Integer>();
 private String[] listViewItems, prices, static_price;
 TypedArray images;
 View row = null;

 static String get_price, get_quntity;
 int g_quntity, g_price, g_minus;

 private Context context;
 CustomButtonListener customButtonListener;

 static HashMap<String, String> map = new HashMap<>();


 public ListAdapter(Context context, String[] listViewItems, TypedArray images, String[] prices) {
  this.context = context;
  this.listViewItems = listViewItems;
  this.images = images;
  this.prices = prices;

  for (int i = 0; i < listViewItems.length; i++) {
   quantity.add(0);
   price.add(0);
  }
 }

 public void setCustomButtonListener(CustomButtonListener customButtonListner) {
  this.customButtonListener = customButtonListner;
 }

 @Override
 public int getCount() {
  return listViewItems.length;
 }

 @Override
 public String getItem(int position) {
  return listViewItems[position];
 }


 @Override
 public long getItemId(int position) {
  return 0;
 }

 @Override
 public View getView(final int position, View convertView, ViewGroup parent) {

  final ListViewHolder listViewHolder;
  if (convertView == null) {
   LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
   row = layoutInflater.inflate(R.layout.activity_custom_listview, parent, false);
   listViewHolder = new ListViewHolder();
   listViewHolder.tvProductName = (TextView) row.findViewById(R.id.tvProductName);
   listViewHolder.ivProduct = (ImageView) row.findViewById(R.id.ivproduct);
   listViewHolder.tvPrices = (TextView) row.findViewById(R.id.tvProductPrice);
   listViewHolder.btnPlus = (ImageButton) row.findViewById(R.id.ib_addnew);
   listViewHolder.edTextQuantity = (EditText) row.findViewById(R.id.editTextQuantity);
   listViewHolder.btnMinus = (ImageButton) row.findViewById(R.id.ib_remove);
   static_price = context.getResources().getStringArray(R.array.Price);
   row.setTag(listViewHolder);
  } else {
   row = convertView;
   listViewHolder = (ListViewHolder) convertView.getTag();
  }


  listViewHolder.ivProduct.setImageResource(images.getResourceId(position, -1));


  try {

   listViewHolder.edTextQuantity.setText(quantity.get(position) + "");

  } catch (Exception e) {
   e.printStackTrace();
  }

  listViewHolder.btnPlus.setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View v) {
    if (customButtonListener != null) {
     customButtonListener.onButtonClickListener(position, listViewHolder.edTextQuantity, 1);

     quantity.set(position, quantity.get(position) + 1);
     price.set(position, price.get(position) + 1);

     row.getTag(position);

     get_price = listViewHolder.tvPrices.getText().toString();

     g_price = Integer.valueOf(static_price[position]);

     get_quntity = listViewHolder.edTextQuantity.getText().toString();
     g_quntity = Integer.valueOf(get_quntity);

     map.put("" + listViewHolder.tvProductName.getText().toString(), " " + listViewHolder.edTextQuantity.getText().toString());
     listViewHolder.tvPrices.setText("" + g_price * g_quntity);
//                    Log.d("A ", "" + a);
//                    Toast.makeText(context, "A" + a, Toast.LENGTH_LONG).show();
//                    Log.d("Position ", "" + position);
//                    System.out.println(+position + " Values " + map.values());
     ShowHashMapValue();
     listViewHolder.tvPrices.setText("" + g_price * g_quntity);
    }


   }

  });
  listViewHolder.btnMinus.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    if (customButtonListener != null) {
     customButtonListener.onButtonClickListener(position, listViewHolder.edTextQuantity, -1);
     if (quantity.get(position) > 0)
      quantity.set(position, quantity.get(position) - 1);

     get_price = listViewHolder.tvPrices.getText().toString();
     g_minus = Integer.valueOf(get_price);
     g_price = Integer.valueOf(static_price[position]);
     int minus = g_minus - g_price;
     if (minus >= g_price) {
      listViewHolder.tvPrices.setText("" + minus);
     }

     map.put("" + listViewHolder.tvProductName.getText().toString(), " " + listViewHolder.edTextQuantity.getText().toString());
     ShowHashMapValue();
    }
   }
  });
  listViewHolder.tvProductName.setText(listViewItems[position]);
  listViewHolder.tvPrices.setText(prices[position]);

  return row;
 }

 private void ShowHashMapValue() {

  /**
   * get the Set Of keys from HashMap
   */
  Set setOfKeys = map.keySet();

/**
 * get the Iterator instance from Set
 */
  Iterator iterator = setOfKeys.iterator();

/**
 * Loop the iterator until we reach the last element of the HashMap
 */
  while (iterator.hasNext()) {
/**
 * next() method returns the next key from Iterator instance.
 * return type of next() method is Object so we need to do DownCasting to String
 */
   String key = (String) iterator.next();

/**
 * once we know the 'key', we can get the value from the HashMap
 * by calling get() method
 */
   String value = map.get(key);

   System.out.println("Key: " + key + ", Value: " + value);
  }
 }
}

解决方案

In onclick, after you decrement the value call notifyDataSetChanged()

notifyDataSetChanged

but its a costly operation, since it refreshes complete list

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