ListView with DataTemplate - java.lang.reflect.InvocationTargetException

Question

So I have this class:

public class MenuItem
{
    public string image { private set; get; }

    public string text { private set; get; }

    public MenuItem (string image, string text)
    {
        this.image = image;
        this.text = text;
    }
}

And the following ViewCell class:

public class MenuItemCell : ViewCell
{
    public MenuItemCell ()
    {
        Grid grid = new Grid
        {
            VerticalOptions = LayoutOptions.FillAndExpand,
            RowDefinitions = 
            {
                new RowDefinition { Height = new GridLength(100, GridUnitType.Auto) },
            },
            ColumnDefinitions = 
            {
                new ColumnDefinition { Width = new GridLength(50, GridUnitType.Auto) },
                new ColumnDefinition { Width = new GridLength(100, GridUnitType.Auto) },
            }
        };

        var menuImage = new Image
        {
            IsVisible = true,
            Aspect = Aspect.AspectFit,
        };

        var text = new Label {
            TextColor = Color.Yellow,
            BackgroundColor = Color.White,
        };

        menuImage.SetBinding (ImageCell.ImageSourceProperty, "image");
        text.SetBinding (Label.TextProperty, "text");

        grid.Children.Add (menuImage, 0, 1, 0, 1);
        grid.Children.Add (text, 1, 2, 0, 1);

        this.View = grid;
    }

The content page is this:

public class Navigation : ContentPage
{
    ListView menu;
    ProfileView profile;
    DataTemplate viewTemplate;
    List<MenuItem> items;

    public Navigation ()
    {
        profile = new ProfileView ();

        items = new List<MenuItem> {
            new MenuItem ("menuTradeIconBig.png", "TRADE"),
            new MenuItem ("menuProfileIconBig.png", "PROFILE"),
            new MenuItem ("menuPositionsIconBig.png", "POSITIONS"),
        };

        menu = new ListView { RowHeight = 40 };
        menu.Header = profile;
        var viewTemplate = new DataTemplate (typeof(MenuItemCell));
        menu.ItemTemplate = viewTemplate;
        menu.ItemsSource = items;

        Content = new StackLayout { 
            Children = {    
                menu
            }
        };
    }

The problem is that when I click the button that is responsible for opening the content page, I get a

java.lang.reflect.InvocationTargetException

If I comment the menu.ItemTemplate = viewTemplate;, the page loads, but in the list view all items have the text MyProjectName.MenuItem.

Answer 1

1 year later, I got back to this question and found the problem in 5 seconds:

This line

menuImage.SetBinding (ImageCell.ImageSourceProperty, "image");

Should be like this

menuImage.SetBinding (Image.ImageSourceProperty, "image");