[英]NotifyDataSetChanged does not update my ListView
即使我正在重新讀取序列化的xml文件,NotifyDataSetChanged()也不更新我的ListView。 它僅在再次調用oncreate后更新。 閱讀一些Java代碼后,它告訴我重新填充listadapter,但這仍然行不通。 有任何想法嗎?
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View view = inflater.Inflate(Resource.Layout.Card, null);
listView = view.FindViewById<ListView>(Resource.Id.cardListView);
return view;
}
public override void OnResume()
{
base.OnResume();
List<string> nameList = new List<string>();
string documentsPath = Android.OS.Environment.ExternalStorageDirectory + "/Gate";
var cardPath = Path.Combine(documentsPath, "card.xml");
if (File.Exists(cardPath))
{
XmlSerializer serializer = new XmlSerializer(typeof(List<Card>));
StreamReader reader = new StreamReader(cardPath);
cardList = (List<Card>)serializer.Deserialize(reader);
reader.Close();
}
else
{
cardList = new List<Card>();
}
foreach (Card card in cardList)
{
nameList.Add(card.name);
}
var adapter = new ArrayAdapter<string>(this.Activity, Android.Resource.Layout.SimpleListItem1, nameList);
listView.Adapter = adapter;
adapter.NotifyDataSetChanged();
}
您只能在OnCreate中創建一次適配器並將其存儲。
然后,在OnResume()中,僅使用adapter.AddAll(nameList)更新值,並調用NotifyDataSetChanged();。
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