<!-- res/layout/example_activity.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/header_container"
      android:orientation="vertical"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" />

  <androidx.fragment.app.FragmentContainerView
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/fragment_container_view"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" />
</LinearLayout>