滚动显示滚动丢失的数据时Listview中的Edittext

Question

我尝试使用edittext进行listview查看，但是我的apdater无法正常工作。当我向下滚动然后向上滚动，所以第一个editext中的值丢失。 我dapter：

public class ArrayAdapterListProduct extends BaseAdapter implements Filterable { 

    private ArrayList<ProductItem> listProductItems = new ArrayList<>(); 
    private ArrayList<ProductItem> mOriginalValues = new ArrayList<>(); 
    private Context context = null; 
    private Activity a = null; 

    static class ViewHolder { 
     TextView text; 
     TextView timestamp; 
     ImageView icon; 
     EditText caption; 
     ProgressBar progress; 
     int position; 
    } 

    public ArrayAdapterListProduct(Activity a, Context context, ArrayList<ProductItem> productItems) { 
     this.listProductItems = productItems; 
     this.mOriginalValues = productItems; 
     this.context = context; 
     this.a = a; 
    } 
    public void swapItem(ArrayList<ProductItem> productItems) { 
     this.listProductItems = productItems; 
     notifyDataSetChanged(); 
    } 

    @Override 
    public int getCount() { 
     return listProductItems.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return null; 
    } 

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

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     View view = convertView; 
     ViewHolder holder; 
     if (view == null) { 
      holder = new ViewHolder(); 
      LayoutInflater inflater = LayoutInflater.from(this.context); 
      view = inflater.inflate(R.layout.layout_lv_item, null); 
      holder.caption = (EditText) view.findViewById(R.id.earnpoit_listview_item_number); 
      view.setTag(holder); 
     } else { 
      holder = (ViewHolder) view.getTag(); 
     } 
     holder.caption = (EditText) view.findViewById(R.id.earnpoit_listview_item_number); 
     view.setTag(holder); 
     if (position % 2 != 0) { 
      view.setBackgroundColor(parent.getResources().getColor(R.color.earnpoint_color_bg_item_lv)); 
     } else { 
      view.setBackgroundColor(parent.getResources().getColor(R.color.WHITE)); 
     } 
     final ProductItem productItem = listProductItems.get(position); 

     TextView txt_name = (TextView) view.findViewById(R.id.earnpoit_listview_item_productname); 
     TextView txt_exist = (TextView) view.findViewById(R.id.earnpoit_listview_item_exist); 
     txt_name.setText(productItem.getName()); 
     txt_exist.setText(productItem.getQuantity() + ""); 

     holder.caption.setText(productItem.getNumber_choose() + ""); 
     holder.caption.setId(position); 

     holder.caption.addTextChangedListener(new MyTextWatcher(holder.caption)); 

     holder.caption.setFilters(new InputFilter[]{new InputFilterMinMax(0, Integer.parseInt(txt_exist.getText().toString()))}); 
     return view; 
    } 

    private class MyTextWatcher implements TextWatcher { 

     private EditText editText; 

     private MyTextWatcher(EditText editText) { 
      this.editText = editText; 
     } 

     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 
      final int position = this.editText.getId(); 
      final EditText Caption = (EditText) this.editText; 
      listProductItems.get(position).setNumber_choose(Integer.parseInt(Caption.getText().toString())); 
      TextView txt_point_to_product = (TextView) a.findViewById(R.id.sellout_txt_point_in_order); 
      Double total_point = 0.0; 
      for (int i = 0; i < listProductItems.size(); i++) { 
       ProductItem productItem1 = listProductItems.get(i); 
       if (productItem1.getNumber_choose() > 0) { 
        total_point = total_point + productItem1.getNumber_choose()*productItem1.getPoint(); 
       } 
      } 
      txt_point_to_product.setText(total_point + ""); 
     } 

     @Override 
     public void afterTextChanged(Editable s) { 

     } 
    } 

    @Override 
    public Filter getFilter() { 
     Filter filter = new Filter() { 
      @Override 
      protected FilterResults performFiltering(CharSequence constraint) { 
       FilterResults results = new FilterResults(); 
       ArrayList<ProductItem> filterArray = new ArrayList<ProductItem>(); 

       if (mOriginalValues == null) { 
        mOriginalValues = new ArrayList<>(listProductItems); 
       } 

       if (constraint == null || constraint.length() == 0) { 
        results.count = mOriginalValues.size(); 
        results.values = mOriginalValues; 
       } else { 
        constraint = constraint.toString().toLowerCase(); 
        for (int i = 0; i < mOriginalValues.size(); i++) { 
         String data = mOriginalValues.get(i).getName(); 
         if (data.toLowerCase().startsWith(constraint.toString())) { 
          filterArray.add(mOriginalValues.get(i)); 
         } 
        } 
        // set the Filtered result to return 
        results.count = filterArray.size(); 
        results.values = filterArray; 
       } 
       return results; 
      } 

      @Override 
      protected void publishResults(CharSequence constraint, FilterResults results) { 
       listProductItems = (ArrayList<ProductItem>) results.values; 
       notifyDataSetChanged(); 
      } 
     }; 
     return filter; 
    } 
} 

请帮助我。谢谢！

Answer 1

请参考下面

holder.edtitext.setTag(position); // add this line 

    holder.edtitext.addTextChangedListener(new TextWatcher() { 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, 
       int count) { 
      int pos = (Integer) holder.edtitext.getTag(); 
      ProductItem productItem1 = listProductItems.get(pos); 

      // do your work 
     } 

     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, 
       int after) { 

     } 

     @Override 
     public void afterTextChanged(Editable s) { 

     } 
    });