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androidandroid-databinding

How can I change a View's visibility based on whether a list is empty or not

I have a List in a model that bounds to a layout using the data-binding lib. How can I change a View's visibility based on the list's isEmpty() condition? Something like android:visibility="@{model.list.isEmpty() ? View.INVISIBLE : View.VISIBLE}"

Solution

  • Ok, although it wasn't clear from the docs, it can be done using custom setters as follows:


    In my model, I had to declare

    @BindingAdapter("android:visibility")
public static void setVisibility(View view, Model model) {

        view.setVisibility(model.getList().isEmpty() ? View.INVISIBLE: View.VISIBLE);
}

    Then, in the layout

     android:visibility="@{model}"

    where model is the name of the model's variable in <variable name=""/>