Question

滚动时，我在自定义ListView中出现位置错误。

我尝试了ViewHolder模式和ArrayAdapter，但都提出了同样的问题。

如果我使用Java重现代码，那么我在滚动时会获得正确的位置。

Xamarin架构错误是什么？

以下是我的示例代码：

活动类

namespace ArrayAdapterDemoApp
{
    [Activity(Label = "ArrayAdapterDemoApp", MainLauncher = true, 
    Icon ="@drawable/icon")]
    public class MainActivity : Activity
    {
        private static List<DataBean> _ItemsList = new List<DataBean>();
        private static CustomAdapter _adapter;
        private ListView _listview;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            // Get our button from the layout resource,
            // and attach an event to it
            _listview = FindViewById<ListView>(Resource.Id.mylist);
            DataBean obj1 = new DataBean();
            obj1.Name = "AA";
            obj1.City = "11";
            _ItemsList.Add(obj1);

            DataBean obj2 = new DataBean();
            obj2.Name = "BB";
            obj2.City = "22";
            _ItemsList.Add(obj2);

            DataBean obj3 = new DataBean();
            obj3.Name = "CC";
            obj3.City = "33";
            _ItemsList.Add(obj3);

            ...

            DataBean obj15 = new DataBean();
            obj15.Name = "OO";
            obj15.City = "1010";
            _ItemsList.Add(obj15);

            _adapter = new CustomAdapter(this, _ItemsList);
            _listview.Adapter = _adapter;
        }
    }
}

自定义适配器

namespace ArrayAdapterDemoApp
{
    public class CustomAdapter : ArrayAdapter<DataBean> 
    {
        private class TaskViewHolder : Java.Lang.Object
        {
            public TextView tvName;
            public TextView tvCity;
        }

        List<DataBean> listData;
        Activity _context;
        int _position;

        public CustomAdapter(Activity context, List<DataBean> dataList)
            : base(context, Resource.Layout.adapter_row, dataList)
        {
            this._context = context;
            this.listData = dataList;
        }

        public override long GetItemId(int position)
        {
            return position;
        }

        public override int Count
        {
            get { return listData.Count; }
        }

        //With View Holder
        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            DataBean data = listData[position];
            TaskViewHolder viewHolder= null; // view lookup cache stored in tag
            if (convertView == null)
            {
                viewHolder = new TaskViewHolder();
                LayoutInflater inflater = LayoutInflater.From(_context);
                convertView = inflater.Inflate(Resource.Layout.adapter_row, parent, false);

                viewHolder.tvName = convertView.FindViewById<TextView>(Resource.Id.text1);
                viewHolder.tvCity = convertView.FindViewById<TextView>(Resource.Id.text2);


                convertView.Tag = viewHolder;
            }

            if(viewHolder==null)
            {
                viewHolder = (TaskViewHolder)convertView.Tag;
            }

            viewHolder.tvName.Text = data.Name;
            viewHolder.tvCity.Text = data.City;

            return convertView;
        }
    }
}

DataBean类

namespace ArrayAdapterDemoApp
{
    public class DataBean
    {
        public string Name { get; set; }
        public string City { get; set; }
    }
}

Answer 1

我也有同样的问题所以我通过将位置标记到视图来解决它。例如。

// iv_delete是一个imageview

holder.iv_delete.Tag = position;

并从标记中获取位置

对我而言就是这样 int finalPosition =（Integer）holder.iv_delete.Tag.IntValue（）;

享受!!!!!

Answer 2

在您的适配器类中添加此方法：

  public DataBean GetItemAtPosition(int position)
  {
       return this.listData[position];
  }

Answer 3

您可以将每行的位置标记到控件以获取正确的位置或另一种方法是使用动作事件绑定到每个视图行。这也解决了重复的方法调用问题。这可能会有所帮助：http://appliedcodelog.blogspot.in/2015/07/working-on-issues-with-listview-in.html#WrongPosition

滚动时在自定义ListView中获取错误的位置

3 个答案: