Question

I am playing around with Monodroid, trying to set an adaptor to a listview at start up. I have a bunch of controls on the screen, what I am trying to do is when the button is clicked an item goes into the listview.

I don’t get any error from the debugger, just a “Unfortunately Application1 has stopped”, which makes it hard to work out what I am doing wrong.

Here is my code:

public class Activity1 : Activity
{
    List<string> items = new List<string>();
    ArrayAdapter<string> adaptor;
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        SetContentView(Resource.Layout.Main);
        int i = 0;

        items.Add("Hello world");
        adaptor = new ArrayAdapter<string>(this,
            Resource.Id.listView1,
            items);

        Button button = FindViewById<Button>(Resource.Id.button1);
        ListView listView = FindViewById<ListView>(Resource.Id.listView1);
        listView.SetAdapter(adaptor);

        button.Click += delegate
        {
            items.Add("Hello " + ++i);
            adaptor.NotifyDataSetChanged();
        };
    }
}

Upon a comment I found the Device Log with the following:

android.content.res.Resources$NotFoundException: Resource ID #0x7f050003 type #0x12 is not valid

This is the ID for the listview in Resource.Designer.cs

public const int listView1 = 2131034115;

The listview is declared like this:

    <ListView
        p1:minWidth="25px"
        p1:minHeight="25px"
        p1:layout_width="wrap_content"
        p1:layout_height="fill_parent"
        p1:id="@+id/listView1"
        p1:layout_marginBottom="70dp" />

Answer 1

I figured it out after reading through the documentation. When instantiating the ArrayAdapter it must be instantiated with reference to Android.Resource.Layout.SimpleListItem1 or another list item resource, rather than the listview itself.