如何使用新数据更新listview（C＃android sqlite） [英] How to update listview wih new data (C# android sqlite)

问题描述

我使用sqlite表创建了一个应用程序。

通过查询所有数据或特定值，将sqlite表加载到带有多列的listview中。

on cklik在listview中的一行中，它会打开新的活动来编辑数据。

新数据正确保存在sqlite表上。

我无法刷新视图仅用于行/列我有变化，但只能通过再次查询适配器。

有没有办法做到这一点？



什么我试过了：



protected override void OnActivityResult（int requestCode，Result resultCode，Intent data）

{

base.OnActivityResult（requestCode，resultCode，data）;

if（resultCode == Result.Ok）

{

int IdReturned = Convert.ToInt32（data.GetStringExtra（Id_Ret））;

int ValueReturned = Convert.ToInt32（data.GetStringExtra（CurMtr_Ret））;

int ListidReturned = Convert.ToInt32（data.GetStringExtra（Listid））;

db.UpdateRec（IdReturned，ValueReturned，1）;

ICursor Rcursor =（ ICursor）listView.GetItemAtPosition（ListidReturned）;

db_cursor = db.FindSingleRec（IdReturned）;

listView.Adapter =（IListAdapter）new MtrCursorAdapter（this，db_cursor，true） ;

（（BaseAdapter）listView.Adapter）.NotifyDataSetChanged（）;

}

}

I have make a app using sqlite table.
The sqlite table is loaded into listview with multicolumns either by quering all of data or for specific values.
On cklik of a row in listview , it opens new activity to edit data.
The new data are saved on sqlite table correctly.
I can't refresh the view only for the row/column i have change but only by quering again the adapter.
Is there a way to do that?

What I have tried:

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
if (resultCode == Result.Ok)
{
int IdReturned = Convert.ToInt32(data.GetStringExtra("Id_Ret"));
int ValueReturned = Convert.ToInt32(data.GetStringExtra("CurMtr_Ret"));
int ListidReturned = Convert.ToInt32(data.GetStringExtra("Listid"));
db.UpdateRec(IdReturned, ValueReturned, 1);
ICursor Rcursor = (ICursor)listView.GetItemAtPosition(ListidReturned);
db_cursor = db.FindSingleRec(IdReturned);
listView.Adapter = (IListAdapter)new MtrCursorAdapter(this, db_cursor, true);
((BaseAdapter)listView.Adapter).NotifyDataSetChanged();
}
}

推荐答案

您需要通知视图数据已更改并需要刷新视图。请参阅如何在Android中正确实施BaseAdapter.notifyDataSetChanged（） [ ^ ]。

You need to notify the view that the data has changed and needs the view to be refreshed. See How to correctly implement BaseAdapter.notifyDataSetChanged() in Android[^].

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