獲取列表視圖項的位置onTextChanged

Question

我有一個餐館的菜單列表視圖，在列表視圖中每行有：項目的

• 項目的圖像
項目
• 名
• 價格
• 編輯文本進入的數量
• 複選框以選擇項

爲了迎合我有一個MenuItem對象類與上面提到的屬性。

我已經實現了自定義適配器的列表視圖。現在我需要在EditText上實現onTextChangedListener，以便每當數量發生變化時，我的對象都會更新，因此會反映在最終訂單帳單中。我已經設置了默認數量爲1

我的適配器類

public class MenuAdapter extends ArrayAdapter<MenuItem> { 

private Context context; 

public MenuAdapter(Context context, int textViewResourceId, List<MenuItem> objects) { 
     super(context, textViewResourceId, objects); 
     this.context = context; 
    } 

    @Override 
    public View getView(int pos, View convertView, ViewGroup parent){ 
     try{ 

      android.view.LayoutInflater inflator = android.view.LayoutInflater.from(getContext()); 

      View customView = inflator.inflate(R.layout.itemdetail, parent, false); 

      MenuItem singleItem = getItem(pos); 
      //ImageView iconImg = (ImageView) customView.findViewById(R.id.imgMenuItem); 
      TextView nameTxt = (TextView) customView.findViewById(R.id.nameText); 
      EditText qtyDdl = (EditText) customView.findViewById(R.id.inputQty); 
      TextView priceTxt = (TextView) customView.findViewById(R.id.priceText); 
      CheckBox selectChk = (CheckBox)customView.findViewById(R.id.chkItem); 

      nameTxt.setText(singleItem.getName()); 
      qtyDdl.setText("1"); 
      qtyDdl.addTextChangedListener(new TextWatcher() 
        {@Override 
       public void onTextChanged(CharSequence s, int start, int before, int count){ 
        int i = start; 


        } 

        @Override 
        public void beforeTextChanged(CharSequence s, int start, int count, int after) { 
         // TODO Auto-generated method stub 

        } 

        @Override 
        public void afterTextChanged(Editable s) { 
         // TODO Auto-generated method stub 

        }}); 
      priceTxt.setText(singleItem.getPrice()); 

      selectChk.setOnCheckedChangeListener((SaltnPepperActivity)context); 

      return customView; 
    }catch(Exception e){ 
     Log.e("MenuAdapter", e.toString()); 
     return null;} 
    } 

}

Q1：我如何獲取在視圖中，每當被更改的行的位置一個textchanged發生？ Q2：我需要在Activity類中實現onTextChangedListener嗎？如果是這樣，我又如何得到在列表中點擊的項目的位置？

Answer 1

得到了哈恩的想法，這是我做過什麼getView函數內部

@Override 
    public View getView(int pos, View convertView, ViewGroup parent){ 
     try{ 

      android.view.LayoutInflater inflator = android.view.LayoutInflater.from(getContext()); 

      final View customView = inflator.inflate(R.layout.itemdetail, parent, false); 

      final MenuItem singleItem = getItem(pos); 
      //ImageView iconImg = (ImageView) customView.findViewById(R.id.imgMenuItem); 
      TextView nameTxt = (TextView) customView.findViewById(R.id.nameText); 
      final EditText qtyDdl = (EditText) customView.findViewById(R.id.inputQty); 
      TextView priceTxt = (TextView) customView.findViewById(R.id.priceText); 
      CheckBox selectChk = (CheckBox)customView.findViewById(R.id.chkItem); 

      nameTxt.setText(singleItem.getName()); 
      qtyDdl.setText("1"); 

      qtyDdl.addTextChangedListener(new TextWatcher() 
        {@Override 
       public void onTextChanged(CharSequence s, int start, int before, int count){ 
        //pos is the item clicked 
         //activity.SetQuantity(customView.getId(), s); 
         try{ 
         singleItem.setQty(Integer.parseInt(qtyDdl.getText().toString())); 
         } 
         catch(NumberFormatException e){} 
        } 

        @Override 
        public void beforeTextChanged(CharSequence s, int start, int count, int after) { 
         // TODO Auto-generated method stub 

        } 

        @Override 
        public void afterTextChanged(Editable s) { 
         // TODO Auto-generated method stub 

        }}); 
      priceTxt.setText(singleItem.getPrice()); 

      selectChk.setOnCheckedChangeListener((SaltnPepperActivity)context); 

      return customView; 
    }catch(Exception e){ 
     Log.e("MenuAdapter", e.toString()); 
     return null;} 
    } 

Answer 2

充分利用EDITTEXT「qtyDdl」最終在getView()方法回調，然後設置位置如下： qtyDdl.setTag(pos)

在這之後，你應該能夠通過調用Integer.parseInt(qtyDdl.getTag().toString());來從textChangeListener位置