Need MotionLayout Reference using DataBinding Tree - kotlin

Question

I'm trying to get the reference to my MotionLayout inside a Fragment inside my RecyclerView so that I can attach my addTransitionListener. I've got the listener prepared, but I don't know the valid path to this object.
I've seen many great examples that reference motionLayout vars, but I can't seem to get a valid one using DataBinding methods.
My RecyclerView is inside my Fragment as:
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/shipper_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="8dp"
android:background="#color/mainList"
tools:listitem="#layout/row_shipper_line"
/>
My MotionLayout is inside my "row_shipper_line" as:
<androidx.constraintlayout.motion.widget.MotionLayout
android:id="#+id/line_container"
android:layout_width="match_parent"
android:layout_height="60dp"
android:background="#color/mainList"
app:layoutDescription="#xml/row_shipper_line_container_scene"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent">
My binding var is set as:
binding = DataBindingUtil.inflate(
inflater,
R.layout.create_shipper_fragment,
container,
false
)
I've got this code entered and it compiles, but the events aren't called:
rec = LayoutInflater.from(context).inflate(R.layout.shipper_list, null)
ml = rec.findViewById(R.id.line_container)
var transitionListener = object : MotionLayout.TransitionListener {
override fun onTransitionStarted(p0: MotionLayout?, startId: Int, endId: Int) {
Log.d("MyApp", "Transition onTransitionStarted.")
}
override fun onTransitionChange(
p0: MotionLayout?,
startId: Int,
endId: Int,
progress: Float
) {
Log.d("MyApp", "Transition onTransitionChange.")
}
override fun onTransitionCompleted(p0: MotionLayout?, currentId: Int) {
Log.d("MyApp", "Transition onTransitionCompleted.")
}
override fun onTransitionTrigger(
p0: MotionLayout?,
triggerId: Int,
positive: Boolean,
progress: Float
) {
Log.d("MyApp", "Transition onTransitionTrigger.")
}
}
ml.setTransitionListener(transitionListener)
My line swipes LEFT perfectly. I just need to listen for onTransitionComplete.
My binding tree looks like this:
Fragment containing my RecyclerView -> Row Layout containing the MotionLayout tag.
What I'm trying to do is something like this:
binding.shipper_list.line_container
Thank you in advance!