How to setup Epoxy clickListener callbacks properly?

Question

I have implemented epoxy according epoxy Wiki. I have several List<items>. I update the controller with the first List<items>, everything works fine. But then I update with the next List<items>, data showed properly from second List<items> in Epoxy View Models, but callbacks are not updated with new items object in listeners callbacks, they are pointing to the first List<items> objects.

This is Epoxy controller part to build models:

@Override
    protected void buildModels(List<Item> items) {
      for (Item item : items) {
        new ItemModel_()
              .id(item.getId())
              .title(item.getTitle())
              .clickListener((model, parentView, clickedView, position)  -> callbacks.onItemClicked(item))
              .addTo(this);
      }      
    }

In epoxy-sample I found clickListener callbacks with lambda implementation. Shown above: .clickListener((model, parentView, clickedView, position) -> callbacks.onItemClicked(item)). I update controller data with different data Lists of List<items>, changing all List<items>in controller.setData(List<items>); according user requests.

Answer 1

It could happen if you use the @ModelProp annotation with an option Option.DoNotHash on the clickListener(Listener) method. [@ModelProp(options = {Option.DoNotHash})]

This option causes the code generated in the ItemModel_ to do not compare previous and new listeners and just use the previous one after the models were updated. Try to use @ModelProp without options or use an Option.IgnoreRequireHashCode instead of Option.DoNotHash.

@ModelProp(options = {Option.IgnoreRequireHashCode})

Also, check the generated ItemModel_.bind(...) method for more information.