content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".android.ui.main.MainActivity"
    tools:showIn="@layout/activity_main">

        <fragment
            android:id="@+id/fgm_maps_fragment"
            android:name="io.aikosoft.alaketclient.android.ui.main.MainMapsFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <fragment
            android:id="@+id/fgm_location_display"
            android:name="io.aikosoft.alaketclient.android.ui.main.LocationDisplayFragment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent" />
      </androidx.constraintlayout.widget.ConstraintLayout>