MvxRecyclerView Fluent API Binding

I am unable to bind ItemClick from MvxRecyclerView (or its Adapter) to a command on my ViewModel using Fluent API. It works if I put both ItemsSource and ItemClick in the XML so I

Solution 1:

When creating a custom MvxRecyclerViewHolder you need to make sure that you assign the Click command over to the ViewHolder. This is done in the OnCreateViewHolder override of your custom adapter.

---

Example for custom ViewHolder

public class MyAdapter : MvxRecyclerAdapter
{
    public MyAdapter(IMvxAndroidBindingContext bindingContext)
        : base(bindingContext)
    {
    }

    public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
    {
        var itemBindingContext = new MvxAndroidBindingContext(parent.Context, this.BindingContext.LayoutInflaterHolder);
        var view = this.InflateViewForHolder(parent, viewType, itemBindingContext);

        return new MyViewHolder(view, itemBindingContext)
        {
            Click = ItemClick,
            LongClick = ItemLongClick
        };
    }
}

Solution 2:

I can't reproduce your issue. I just created a new project, added a RecyclerView and added the following binding:

var set = this.CreateBindingSet<FirstView, FirstViewModel>();
set.Bind(recyclerView).For(v => v.ItemsSource).To(vm => vm.ViewModelItems);
set.Bind(recyclerView).For(v => v.ItemClick).To(vm => vm.ShowItemCommand);
set.Apply();

This works just as expected, where ItemClick triggers the ShowItemCommand. VM's look as follows:

public class ViewModelItem : MvxViewModel
{
    public void Init(string itemId)
    {
        Mvx.Trace($"Showing {itemId}");
    }

    public string Id { get; set; }
}


public class FirstViewModel
    : MvxViewModel
{
    public FirstViewModel()
    {
        ViewModelItems = new ViewModelItem[] {
            new ViewModelItem { Id = "Hello"},
            new ViewModelItem { Id = "World"},
            new ViewModelItem { Id = "Foo"},
            new ViewModelItem { Id = "Bar"},
            new ViewModelItem { Id = "Baz"}
        };
    }

    private IEnumerable<ViewModelItem> _viewModelItems;
    public IEnumerable<ViewModelItem> ViewModelItems
    {
        get { return _viewModelItems; }
        set { SetProperty(ref _viewModelItems, value); }
    }

    public MvxCommand<ViewModelItem> ShowItemCommand =>
        new MvxCommand<ViewModelItem>(DoShowItem);

    private void DoShowItem(ViewModelItem item)
    {
        ShowViewModel<ViewModelItem>(new { itemId = item.Id });
    }
}