Question

1.) My main.xml contains :

<ListView
        android:id="@+id/lsym"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

2.) After populating the list, I’m assigning an adapter to it as follows :

lsym.Adapter=new SymbolAdapter(this,result);

where result is a DataTable.

3.) Within SymbolAdapter, I have used :

convertView = inflater.Inflate(Resource.Layout.list_symbol, null);

4.) list_symbol.xml contains :

<RelativeLayout android:id="@+id/symbolLayout" 
    android:layout_height="wrap_content" 
    android:layout_width="wrap_content">

    <TextView 
        android:id="@+id/tvsym" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</RelativeLayout>

5.) And finally, for list item click, I’m using following code snippet:

   lsym.ItemClick+= SearchItem_Click;

&

   private void SearchItem_Click(object sender, ItemEventArgs e)
        {
            string  company=((TextView)e.View).Text;
            Toast.MakeText(this, "Selected="+company,ToastLength.Short).Show();
        }

as specified here.

But when I click a list item, it is giving me following error :

System.InvalidCastException: Cannot cast from source type to destination type.
SearchItem_Click (object,Android.Widget.ItemEventArgs)

at ((TextView)e.View).Text.

ANY IDEA WHY THIS IS HAPPENING?
I know I have put up lot of code but as I’m absolute beginner to mono for android, so any help appreciated.

Answer 1

e.View is RelativeLayout so casting it to TextView will not work …
instead of this you should call FindViewById(Resource.Id.tvsym) on that view ( not just plain since it will be called on Activity)

code should looks like:

TextView rowText = (TextView)e.View.FindViewById(Resource.Id.tvsym);

EDIT: or in Mono you can use:

TextView rowText = e.View.FindViewById<TextView>(Resource.Id.tvsym);