如何在列表視圖中獲取上一個選中的位置

Question

實際上，當我觸摸列表視圖時，我會看到一個列表視圖，當我選中複選框並按下確定時，彈出窗口將顯示覆選框，然後關閉對話框，以及何時我再次觸摸列表視圖，然後選中的行位置將更改背景顏色並存儲到數據庫中。實際上，當我再次選擇不同的項目位置並檢查並按下OK並再次觸摸列表視圖而不是輸入數據庫中的檢查位置時，先前檢查的位置也與當前檢查的位置一起進入數據庫。所以我需要在列表視圖看到檢查的位置之前獲得先前的位置和清除位置。所以它只能進入當前位置。

我的活動

listView1.setOnTouchListener(new AdapterView.OnTouchListener() { 
    @Override 
    public boolean onTouch(View v, MotionEvent event) { 
     if (event.getAction() == MotionEvent.ACTION_UP) { 
      newListitems2.clear(); 
      newListitems2.addAll(itemsList1); 

      dialog = new Dialog(PendingOrdersActitvity.this); 
      dialog.setContentView(R.layout.itembumping); 

      dialog.show(); 

      //listView1.setTag(position); 
      list1 = (ListView) dialog.findViewById(R.id.list1); 

      ItemBumpingAdapter adapter2 = new ItemBumpingAdapter(PendingOrdersActitvity.this, newListitems2); 
      list1.setAdapter(adapter2); 

      Button okButton = (Button) dialog.findViewById(R.id.ok1); 
      okButton.setOnClickListener(new OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        dialog.dismiss(); 
       } 
      }); 
      Button cancelButton = (Button) dialog.findViewById(R.id.Cancel1); 
      cancelButton.setOnClickListener(new OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        // TODO Auto-generated method stub 
        dialog.dismiss(); 
       } 
      }); 
     } 
     return true; 
    } 
}); 

Implimented代碼：

listView1.setOnTouchListener(new AdapterView.OnTouchListener() { 

       @Override 
       public boolean onTouch(View v, MotionEvent event) { 
         if(event.getAction() == MotionEvent.ACTION_UP){ 



        newListitems2.clear(); 
        newListitems2.addAll(itemsList1); 

        dialog = new Dialog(PendingOrdersActitvity.this); 
         dialog.setContentView(R.layout.itembumping); 

         dialog.show(); 





         list1=(ListView)dialog.findViewById(R.id.list1); 


         ItemBumpingAdapter adapter2 = new ItemBumpingAdapter(PendingOrdersActitvity.this,newListitems2); 
         list1.setAdapter(adapter2); 






         Button okButton = (Button)dialog.findViewById(R.id.ok1); 
         okButton.setOnClickListener(new OnClickListener() { 

          @Override 
          public void onClick(View v) { 

           dialog.dismiss(); 


           Connection con1 = DbHandler.dbConnection(); 
           try{ 
           PreparedStatement stmt1 = con1 
             .prepareStatement("Select Line_No, ItemName,DeleteFlag from PendingOrders_Dtl where Inv_No=? "); 

           stmt1.setString(1,invNo); 
           ResultSet rsSetup1 = stmt1.executeQuery(); 


           if (rsSetup1.next()) { 
            ItemsBean bean1 = new ItemsBean(); 


             bean1.setLinenum(rsSetup1.getInt("Line_No")); 
             bean1.setProdnum(rsSetup1.getInt("ItemName")); 

             bean1.setDeleteFlag(rsSetup1.getInt("DeleteFlag")); 
            disablelist.add(bean1); 



           } 

           CustomAdapter adapter1 = new CustomAdapter(PendingOrdersActitvity.this, itemsList1); 
            for(int i=0;i<itemsList1.size();i++) 
            { 
             for(int j=0;j<disablelist.size();j++) 
             { 
             if(itemsList1.get(i).getProdnum()==disablelist.get(j).getProdnum()) 
             { 

              itemsList1.get(i).setSelection(true); 



             } 




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

       }); 

Answer 1

嘗試這樣的事情

int previousPosition; 

    public int getPreviousPosition() { 
return previousPosition; 
} 


public void setPreviousPosition(int previousPosition) { 
this.previousPosition = previousPosition; 
} 

，並在您的列表視圖的項目中選擇收聽

listview.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

     int prePos= getPreviousPosition(); 
     // do what ever you want to do with this prePos  



    View viewchild= parent.getChildAt(getPreviousPosition()); 
      CheckBox prevCheckBox=(CheckBox)viewchild.findViewById(R.id.Checkbox_sort_list); 
      prevCheckBox.setChecked(false); 

     //at ending of list view write this 
      setPreviousPosition(position); 

     } 
    }); 

Answer 2

我想你已經在itemList1中保留了選中的位置，所以在將它複製到newListitems2之後，你需要清除newListitems2中的選中位置。 試試這個：

listView1.setOnTouchListener(new AdapterView.OnTouchListener() { 
@Override 
public boolean onTouch(View v, MotionEvent event) { 
    if (event.getAction() == MotionEvent.ACTION_UP) { 
     newListitems2.clear(); 
     newListitems2.addAll(itemsList1); 

     dialog = new Dialog(PendingOrdersActitvity.this); 
     dialog.setContentView(R.layout.itembumping); 

     dialog.show(); 

     //listView1.setTag(position); 
     list1 = (ListView) dialog.findViewById(R.id.list1); 

     // Uncheck all items of newListitems2 
     for(int i=0; i<newListitems2.size(); i++){ 
      ItemsBean tmpItem = newListitems2.get(i); 
      tmpItem.setChecked(false); 
      newListitems2.remove(i); 
      newListitems2.add(i, tmpItem); 
     } 

     ItemBumpingAdapter adapter2 = new ItemBumpingAdapter(PendingOrdersActitvity.this, newListitems2); 
     list1.setAdapter(adapter2); 

     Button okButton = (Button) dialog.findViewById(R.id.ok1); 
     okButton.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       dialog.dismiss(); 
      } 
     }); 
     Button cancelButton = (Button) dialog.findViewById(R.id.Cancel1); 
     cancelButton.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       dialog.dismiss(); 
      } 
     }); 
    } 
    return true; 
} 
}); 

對於其他問題：

方法1：

如果在彈出的對話框的列表是相同的主目錄，則可以嘗試：當被駁回對話，從彈出的對話框中獲取列表並將其複製到主列表中。在Adapter類

1. Add方法來從適配器2獲取列表：

   public ArrayList<ItemsBean> getItemList(){ 
       return newListitems; 
   } 
   

2. 當okbutton點擊，在寫的主列表，並關閉該對話框：

   itemsList1 = adapter2.getItemList(); 
   adapter1 = new ItemBumpingAdapter(PendingOrdersActitvity.this, itemList1); 
   adapter1.notifyDataSetChanged(); 
   dialog.dismiss(); 
   

方法2：

1. Add方法適配器1，檢查項目：

   public void checkItemsAccordingDatabase(){ 
       for(int i=0; i<newListItems; i++){ 
        ItemsBean tmpItem = newListItems.get(i); 
        // query tmpItem in database. 
        // if tmpItem exits, newListItems.get(i).setChecked(true). 
       } 
       notifyDataSetChanged(); 
   } 
   

2. 當okbutton點擊，更新主列表，並關閉該對話框：

   adapter1.checkItemsAccordingDatabase(); 
   dialog.dismiss(); 
   

Answer 3

試試這個：

// Move this after setSelection. 
// CustomAdapter adapter1 = new CustomAdapter(PendingOrdersActitvity.this, itemsList1); 

for(int i=0;i<itemsList1.size();i++){ 
    for(int j=0;j<disablelist.size();j++){ 
     if(itemsList1.get(i).getProdnum()==disablelist.get(j).getProdnum()){ 
      itemsList1.get(i).setSelection(true); 
      break; 
     } 
    } 
}  
CustomAdapter adapter1 = new CustomAdapter(PendingOrdersActitvity.this, itemsList1); 
listView1.setAdapter(adapter1); 

並修改CustomAdapter的getView（）類似於您的ItemBumpingAdapter：

if(newListItems.isSelected()){ 
    convertView.setBackgroundColor(...); 
else{ 
    convertView.setBackgroundColor(...); 
} 
retrun convertView;