xamarin andriod popupwindow自定义列表视图itemclick事件不起作用

我写了一个演示，它正在运行GIF。

有我的代码 MainActivity.cs

   public class MainActivity : AppCompatActivity
{

    List<News> data;
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        // Set our view from the "main" layout resource
       SetContentView(Resource.Layout.activity_main);
     
        Button button1 = FindViewById<Button>(Resource.Id.button1);
        button1.Click += (o, e) =>
        {
            var popup = OnClick();
            popup.ShowAsDropDown((View)o, 0, 0);
        };

         data = new List<News>() {
            new News ("aaaaaaaa",1200),
            new News ("bbbbbbbbb",560),
            new News ("ccccccccc",158200),
            new News ("ddddddddd",900),
           
        };
     //   adapter = new NewsAdapter(data, this);
      
    }

    private PopupWindow OnClick()
    {
        
        PopupWindow _popupWindow = new PopupWindow(this);

       LayoutInflater inflater= (LayoutInflater)this.GetSystemService(Context.LayoutInflaterService);
        View popup=inflater.Inflate(Resource.Layout.window_popup_content,null);
        ListView listView1 = popup.FindViewById<ListView>(Resource.Id.listView1);
        NewsAdapter adapter = new NewsAdapter(data, this);
        listView1.Adapter = adapter;

        

        listView1.ItemClick += (sender, args) =>
        {
           
           
             Toast.MakeText(this, data[args.Position].Title + "", ToastLength.Short).Show();
            _popupWindow.Dismiss();
        };

        _popupWindow.Width = ViewGroup.LayoutParams.WrapContent;
        _popupWindow.Height = ViewGroup.LayoutParams.WrapContent;
        _popupWindow.ContentView = popup;
        return _popupWindow;
    }
}

有的适配器listview。

    public class NewsAdapter : BaseAdapter
{
    private List<News> data;
    private Context context;
    public override int Count
    {
        get
        {
            return data.Count;
        }
    }

    public NewsAdapter(List<News> data, Context context)
    {
        this.data = data;
        this.context = context;
    }


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

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

    public override View GetView(int position, View convertView, ViewGroup parent)
    {
        convertView = LayoutInflater.From(context).Inflate(Resource.Layout.lv_test, parent, false);
        TextView title = convertView.FindViewById<TextView>(Resource.Id.tv_title);
        TextView pv = convertView.FindViewById<TextView>(Resource.Id.tv_pv);
        pv.Text = data[position].Pv.ToString();
        title.Text = data[position].Title;
        return convertView;

    }

的 ListviewItem

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
>
<LinearLayout
    android:id="@+id/layout_content"
    android:layout_width="match_parent"
    android:layout_height="30dp"
    android:orientation="horizontal"
    android:gravity="center_vertical">
    <TextView
        android:id="@+id/tv_title"
        android:layout_height="20dp"
        android:layout_width="0dp"
        android:layout_weight="5"
        android:textColor="#000000"
        android:text="aaaaaaaaa"
        android:textSize="16dp" />
    <TextView
        android:id="@+id/tv_pv"
        android:layout_height="10dp"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:textColor="#808080"
        android:textSize="10dp"
        android:text="19665"
        
        android:gravity="right|center_vertical" />
</LinearLayout>
<View
    android:layout_height="1dp"
    android:layout_width="match_parent"
    android:background="#dedede" />
</LinearLayout> 

有我的演示。你可以参考一下。https://github.com/851265601/ListviewPopUpWindowDemo