爲什麼列表視圖行項目被點擊多次？

我已經在中實現了ListView，Xamarin.Android在rowlist中有幾個按鈕，但是當我點擊按鈕時，它不止一次地被點擊。我試過這種方式，但沒有爲我工作。我在BaseAdapter<DA_ClassSectionAttendance>爲什麼列表視圖行項目被點擊多次？

public override View GetView(int position, View convertView, ViewGroup parent) 
    { 
     View view = convertView; 

     // re-use an existing view, if one is available 
     // otherwise create a new one 
     if (view == null) 
      view = context.LayoutInflater.Inflate(Resource.Layout.AttendanceCreateRowList, parent, false); 
     var viewHolder = new ViewHolder(view); 

     DA_ClassSectionAttendance attendance = this[position]; 

     view.Tag = viewHolder; 
     viewHolder.ClassSection.Text = attendance.ClassName + " " + attendance.SectionName; 
     viewHolder.AttendanceEdit.Text = "Edit"; 
     viewHolder.AttendanceNew.Text = "New"; 
     viewHolder.AttendanceNew.Tag = viewHolder; 
     viewHolder.AttendanceNew.Click += (object sender, EventArgs ex) => 
     { 

      var obj = sender as Button; 
      var listView = parent as ListView; 
      //int objectPosition = (int)obj.Tag; 
      var itemPosition = listView.GetPositionForView(obj); 
      if (itemPosition != ListView.NoId) 
      { 

       CustomFragmentManager fragManager = new CustomFragmentManager(); 
       var fragment = new AttendanceCreateRecyclerFragment(); 
       Bundle args = new Bundle(); 
       var jsonData = JsonConvert.SerializeObject(this[itemPosition]).ToString(); 
       args.PutString(AttendanceCreateRecyclerFragment.DATA_RECEIVE, jsonData); 
       fragment.Arguments = args; 

       fragManager.ReplaceFragment(context, fragment); 

      } 

     }; 

     return view; 
    }

這種方法和觀點持有者是如下

private class ViewHolder : Java.Lang.Object 
    { 
     public ViewHolder(View view) 
     { 
      ClassSection = view.FindViewById<TextView>(Resource.Id.class_section); 
      AttendanceNew = view.FindViewById<Button>(Resource.Id.new_attendance); 
      AttendanceEdit = view.FindViewById<Button>(Resource.Id.edit_attendance); 
     } 

     public TextView ClassSection { get; set; } 
     public Button AttendanceNew { get; set; } 
     public Button AttendanceEdit { get; set; } 
    }

我想實現點擊事件，而不是點擊監聽器。如果任何示例代碼以及解釋將非常感謝。謝謝。

來源

2017-11-11 Ishwor Khanal

RecylerView比ListView更高效。你應該使用RecylerView。 '我想實現點擊事件而不是點擊偵聽器 - 有什麼區別？如果將點擊偵聽器設置爲視圖，則可以在單擊視圖時攔截點擊事件。如果您想攔截點擊事件，則需要設置點擊偵聽器。 –

使用recylerView你將獲得大量的動畫和平滑滾動 –

的原因是，點擊事件得到與viewHolder.AttendanceNew.Click += (object sender, EventArgs ex) =>

多次附加您創建和使用視圖持有人是不工作的方式。將代碼更改爲如下所示：

public override View GetView(int position, View convertView, ViewGroup parent) 
{ 
    View view = convertView; 

    // re-use an existing view, if one is available 
    // otherwise create a new one 
    if (view == null) 
     view = context.LayoutInflater.Inflate(Resource.Layout.AttendanceCreateRowList, parent, false); 

    var viewHolder = view.Tag as ViewHolder; 

    if (viewHolder == null) 
    { 
     viewHolder = new ViewHolder(view); 
     viewHolder.AttendanceNew.Click += (object sender, EventArgs ex) => 
     { 
      var obj = sender as Button; 
      var listView = parent as ListView; 

      var itemPosition = listView.GetPositionForView(obj); 

      if (itemPosition != ListView.NoId) 
      { 
       CustomFragmentManager fragManager = new CustomFragmentManager(); 
       var fragment = new AttendanceCreateRecyclerFragment(); 
       Bundle args = new Bundle(); 
       var jsonData = JsonConvert.SerializeObject(this[itemPosition]).ToString(); 
      args.PutString(AttendanceCreateRecyclerFragment.DATA_RECEIVE, jsonData); 
       fragment.Arguments = args; 

       fragManager.ReplaceFragment(context, fragment); 
      } 
     }; 
    } 

    var attendance = this[position]; 

    viewHolder.ClassSection.Text = attendance.ClassName + " " + attendance.SectionName; 
    viewHolder.AttendanceEdit.Text = "Edit"; 
    viewHolder.AttendanceNew.Text = "New"; 

    view.Tag = viewHolder; 

    return view; 
}

來源

2017-11-11 15:03:04

爲什麼列表視圖行項目被點擊多次？

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