Kotlin, embed root_preferences in existing fragment - kotlin

Question

Kotlin, I want to embed root_preferences.xml in a fragment with existing content. I navigate using <navigation..> I want to embed the preferences like this:
// ... existing items
<include
android:id="#+id/summaryPrefs"
layout="#layout/fragment_container_settings"
/>
// ... more items here
What I did
Create new Settings Fragment. This does NOT create a layout file, but an XML file at res/xml/root_preferences.xml, make no changes to code.
Create a 'container fragment' new Fragment (Blank) name it, ContainerSettingsFragment. it creates the layout file fragment_container_settings.
Delete code in class ContainerSettingsFragment and replace with this:
// Make a container fragment that holds the preference xml.
class ContainerSettingsFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_container_settings, container, false)
requireActivity().supportFragmentManager
.beginTransaction()
.replace(
R.id.settings, // this is the id in fragment_container_settings <FrameLayout>
SettingsFragment() // SR: ?? This loads the XML into this fragment
)
.commit()
// Inflate the layout for this fragment
return view
}
}
Replaced code in fragment_container_settings with this:
FrameLayout
android:id="#+id/settings"
android:layout_width="250dp"
android:layout_height="300dp"
Expected result: FrameLayout #+id/settings displays the contents of root_preferences
Actual: Size is 250dp x250dp but none of the items are displayed

Answer 1

Was easy, if using nav_graph, don't mix with .supportFragmentManager
I removed all the code in the container settings fragment.
): View? {
return inflater.inflate(R.layout.fragment_container_settings, container, false)
}
Completed layout in fragment_container_settings.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/settingsSummary"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.settingssummary.ContainerSettingsFragment">
</androidx.constraintlayout.widget.ConstraintLayout>
Used include to add to fragment_settings_summary