RotaryPlayground/res/layout/rotary_web_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2020 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.
  -->
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.android.car.ui.FocusArea
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/toggle_buttons"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:text="Toggle Buttons"/>

    </com.android.car.ui.FocusArea>

    <com.android.car.ui.FocusArea
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="vertical">

        <Button
            android:id="@+id/top_button"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:onClick="onRotaryButtonClick"
            android:tag="test_button"
            android:text="Top Button"
            android:visibility="gone" />

        <WebView
            android:id="@+id/web_view"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:defaultFocusHighlightEnabled="false"/>

        <Button
            android:id="@+id/bottom_button"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:onClick="onRotaryButtonClick"
            android:tag="test_button"
            android:text="Bottom Button"
            android:visibility="gone" />

    </com.android.car.ui.FocusArea>

</LinearLayout>