Question

我正在尝试从列表视图中删除行。单击“删除”时，将删除该行。但是，ListView无法更新。我必须单击后退按钮然后返回以查看删除的项目。在删除某个项目后，有没有办法刷新页面？这是我的代码：

public class OrderHistoryAdapter : BaseAdapter
{
    private List<Order> _orders;
    private Activity _context;


    public OrderHistoryAdapter(Activity context, List<Order> orders)
    {
        _context = context;
        _orders = orders;
    }

    public override View GetView(int position, View convertView, ViewGroup parent)
    {
        var item = _orders.ElementAt(position);

        var view = (convertView ??
                this._context.LayoutInflater.Inflate(
                Resource.Layout.OrderHistoryDetailsRow,
                parent,
                false)) as RelativeLayout;




        TextView orderHistoryText = view.FindViewById<TextView>(Resource.Id.orderHistoryText);
        orderHistoryText.Text = ((Order)item).Date.ToShortDateString();
        view.FindViewById<TextView>(Resource.Id.btnDeleteOrder).Click += delegate
        {
            OrderRepository orderRepo = new OrderRepository();
            orderRepo.Delete(((Order)item).Id);
            //Item has been deleted, yet list fails to update
            NotifyDataSetChanged();
        };


        //Finally return the view
        return view;
    }


    public override int Count
    {
        get { return _orders.Count(); }
    }

    public Order GetOrder(int position)
    {
        return _orders.ElementAt(position);
    }

    public override Java.Lang.Object GetItem(int position)
    {
        return null;
    }

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

Answer 1

即使您在存储库中删除它，该对象仍然位于适配器（_orders）中存储的订单列表中。在致电NotifyDataSetChanged()

之前，请尝试从该列表中删除该对象

Answer 2

更新ListView

   private ListView lvAnuncios= null;

   ....
   {
        this.lvAnuncios = this.FindViewById<ListView>(Resource.Id.MisAnuncios_lvAnuncios);
   }

   private void ReloadListView()
   {
        if (this.lvAnuncios.Adapter == null)
        {
            this.lvAnuncios.Adapter = new adAnuncio(this, Resource.Layout.FilaListViewAnuncio, csVariable.objUsr.lstAnuncios);
        }
        else
        {
            ((BaseAdapter)this.lvAnuncios.Adapter).NotifyDataSetChanged();
        }
   }

Answer 3

尝试在NotifyDataSetChanged()个实例上调用OrderHistoryAdapter（或类似内容）。

Mono for Android：ListView删除项目NotifyDataSet已更改

3 个答案: