res/layout/dialer_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2016 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->
<!-- There seems to be a bug in layout inflation where it can't use a resource to inflate a view
     group that sets layout_marginTop with a dimension. Work around by putting in a shell layout.
-->
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="@dimen/car_app_bar_height">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <FrameLayout
            android:id="@+id/dialpad_fragment_container"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/divider"
            app:layout_constraintTop_toTopOf="parent"/>

        <View
            android:id="@+id/divider"
            android:background="@color/car_list_divider"
            android:layout_gravity="end|top"
            android:layout_height="0dp"
            android:layout_width="@dimen/line_divider_height"
            app:layout_constraintBottom_toBottomOf="@+id/dialpad_fragment_container"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="@+id/dialpad_fragment_container"/>

        <FrameLayout
            android:id="@+id/dialer_info_fragment_container"
            android:layout_height="0dp"
            android:layout_width="0dp"
            android:paddingStart="@dimen/car_keyline_1"
            android:paddingEnd="@dimen/car_keyline_1"
            app:layout_constraintBottom_toBottomOf="@+id/dialpad_fragment_container"
            app:layout_constraintStart_toEndOf="@+id/divider"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="@+id/dialpad_fragment_container">
            <include layout="@layout/dialer_info_fragment"/>
        </FrameLayout>
    </androidx.constraintlayout.widget.ConstraintLayout>
</FrameLayout>