Anyone have any idea why a BindingAdapter is being recognized at compile time as available, but at runtime during view inflation, the adapter is not called? It's as if the Xml parser is just skipping right over those attributes

This feels like a better fit for Stack Overflow, but what does your

BindingAdapter

look like? https://gitlab.com/commonsguy/cw-andexplore/blob/v0.7/T15-Display/ToDo/app/src/main/java/com/commonsware/todo/BindingAdapters.kt is an example one in Kotlin, which I use at https://gitlab.com/commonsguy/cw-andexplore/blob/v0.7/T15-Display/ToDo/app/src/main/res/layout/todo_display.xml#L64

It's a standard Kotlin extension binding. Single argument extended off of View that sets a value on the view

Extending

View

should be fine. Anything unusual about the binding expression in the layout? For example, are you not matching on data types for the value?

I am not, is that a requirement? I thought you could pass primitives without a data type? The in xml line is:

app:pcuDefault="true"

Change that to

app:pcuDefault="@{true}"

and see if that works. It has to be a binding expression with the

@{}

syntax, as the data binding system ignores ordinary XML attributes. I have not tried a boolean constant as the binding expression, though.

make sure you set your lifecycle observer, too

that only matters if you are binding a

LiveData

-- in this case, it's a constant

Ended up driving and not replying, but @Mark Murphy that both was the challenge and is indeed something you can do. Data binding is perfectly happy with constants passed in like that. Thank you for the help!