Ok, so I tried to cast the adapter, but nothing happens. Here is my code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using LoadSiteList;
using Android.Util;
using System.Threading;
namespace MonoActivityFun
{
[Activity(Label = "My Activity")]
public class MyListActivity : ListActivity
{
List<String> list;
private ProgressDialog d;
string tag = "TEST";
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
list = new List<String>();
MyModel m = new MyModel();
m.Items.CollectionChanged += new
System.Collections.Specialized.NotifyCollectionChangedEventHandler(Items_CollectionChanged);
ThreadPool.QueueUserWorkItem(o => m.Load());
if (list.Count == 0)
{
list.Add("No data present");
}
ListAdapter = new ArrayAdapter<string>(this,
Resource.Layout.list_item, list);
ListView.TextFilterEnabled = true;
SetContentView(ListView);
ListView.ItemClick += delegate(object sender, ItemEventArgs args)
{
// When clicked, show a toast with the TextView text
Toast.MakeText(Application,
((TextView)args.View).Text, ToastLength.Short).Show();
};
}
void Items_CollectionChanged(object sender,
System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
Log.Warn(tag, "MyListActivity: e.NewItems count " +
e.NewItems.Count.ToString());
foreach (object s in e.NewItems)
{
Log.Warn(tag, "MyListActivity:
Items_CollectionChanged: " + s.ToString());
list.Add(s.ToString());
if (list.Contains("No data present")) {
list.Remove("No data present");
}
}
RunOnUiThread(() =>
{
((BaseAdapter)this.ListAdapter).NotifyDataSetChanged();
});
}
}
}
}
I know that this code enters Items_Collection changed as i can easily
output the things being added to list.
I have tried running it on the UI thread and not, both fail to update
the ListView with new data.
On Thu, Sep 1, 2011 at 2:07 PM, Greg Shackles <[email protected]> wrote:
> Adapters generally all inherit from BaseAdapter so they'll have access to
> the method (this is exactly the same as the Java side, for what it's worth).
> I don't know what your code looks like, but my guess is that you're doing
> something along the lines of:
> var view = FindViewById<ListView>(Resource.Id.List);
> view.Adapter = new ArrayAdapter(.....); // or some other kind of adapter
> view.Adapter.NotifyDataSetChanged();
> The last line won't compile since the Adapter property on ListView is of
> type IListAdapter
> (http://docs.mono-android.net/index.aspx?link=P%3aAndroid.Widget.ListView.Adapter).
> You can either cast the adapter when you want to access those methods:
> ((ArrayAdapter)view.Adapter).NotifyDataSetChanged();
> Or you can keep a reference to the object with its type when you create it
> (this is the approach I'd prefer):
> var adapter = new ArrayAdapter(......);
> view.Adapter = adapter;
> adapter.NotifyDataSetChanged();
>
> On Thu, Sep 1, 2011 at 7:54 AM, Tomasz Cielecki <[email protected]>
> wrote:
>>
>> So that means I have to cast the ListAdapter to BaseAdapter to invoke
>> that method?
>>
>> On Thu, Sep 1, 2011 at 1:35 PM, Greg Shackles <[email protected]> wrote:
>> > That method is available as part of Mono for
>> >
>> > Android: http://docs.mono-android.net/index.aspx?link=M%3aAndroid.Widget.BaseAdapter.NotifyDataSetChanged
>> >
>> > On Thu, Sep 1, 2011 at 6:48 AM, Tomasz Cielecki <[email protected]>
>> > wrote:
>> >>
>> >> Hello there,
>> >>
>> >> I have a asynchronous method loading data in the background, when that
>> >> is finished I want to update my ListView with the data this method has
>> >> loaded into an ObservableCollection. It seems that normally when
>> >> coding java you can invoke the method notifyDataSetChanged on the
>> >> ListAdapter, but this method seems to be missing in MonoDroid.
>> >>
>> >> So my question is, how do I update my ListView with this new data?
>> >>
>> >> --
>> >> Med Venlig Hilsen / With Best Regards
>> >> Tomasz Cielecki
>> >> http://ostebaronen.dk
>> >> _______________________________________________
>> >> Monodroid mailing list
>> >> [email protected]
>> >>
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>> >
>> >
>> > _______________________________________________
>> > Monodroid mailing list
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>> >
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>> >
>>
>>
>>
>> --
>> Med Venlig Hilsen / With Best Regards
>> Tomasz Cielecki
>> http://ostebaronen.dk
>> _______________________________________________
>> Monodroid mailing list
>> [email protected]
>>
>> UNSUBSCRIBE INFORMATION:
>> http://lists.ximian.com/mailman/listinfo/monodroid
>
>
> _______________________________________________
> Monodroid mailing list
> [email protected]
>
> UNSUBSCRIBE INFORMATION:
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>
--
Med Venlig Hilsen / With Best Regards
Tomasz Cielecki
http://ostebaronen.dk
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