为什么列表视图行项目被点击多次？

问题描述：

我已经在中实现了ListView，Xamarin.Android在rowlist中有几个按钮，但是当我点击按钮时，它不止一次地被点击。我试过这种方式，但没有为我工作。我在BaseAdapter<DA_ClassSectionAttendance>为什么列表视图行项目被点击多次？

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; 
    }

这种方法和观点持有者是如下

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; } 
    }

我想实现点击事件，而不是点击监听器。如果任何示例代码以及解释将非常感谢。谢谢。

RecylerView比ListView更高效。你应该使用RecylerView。 '我想实现点击事件而不是点击侦听器 - 有什么区别？如果将点击侦听器设置为视图，则可以在单击视图时拦截点击事件。如果您想拦截点击事件，则需要设置点击侦听器。 –

使用recylerView你将获得大量的动画和平滑滚动 –

答

的原因是，点击事件得到与viewHolder.AttendanceNew.Click += (object sender, EventArgs ex) =>

多次附加您创建和使用视图持有人是不工作的方式。将代码更改为如下所示：

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; 
}

为什么列表视图行项目被点击多次？

相关推荐