core/res/res/layout-car/car_alert_dialog_button_bar.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.
  -->

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/buttonPanel"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollbarAlwaysDrawVerticalTrack="true"
    android:scrollIndicators="top|bottom"
    android:fillViewport="true"
    style="?attr/buttonBarStyle">
    <com.android.internal.widget.ButtonBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingStart="@dimen/button_bar_layout_start_padding"
        android:paddingEnd="@dimen/button_bar_layout_end_padding"
        android:paddingTop="@dimen/button_bar_layout_top_padding"
        android:layoutDirection="locale"
        android:orientation="horizontal"
        android:gravity="left|center_vertical">

        <Button
            android:id="@+id/button3"
            style="@style/CarDialogButtonText"
            android:minWidth="@dimen/car_touch_target_size"
            android:paddingStart="@dimen/car_padding_2"
            android:paddingEnd="@dimen/car_padding_2"
            android:background="@drawable/car_dialog_button_background"
            android:layout_marginRight="@dimen/button_end_margin"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/button_layout_height" />

        <Button
            android:id="@+id/button2"
            style="@style/CarDialogButtonText"
            android:minWidth="@dimen/car_touch_target_size"
            android:paddingStart="@dimen/car_padding_2"
            android:paddingEnd="@dimen/car_padding_2"
            android:background="@drawable/car_dialog_button_background"
            android:layout_marginRight="@dimen/button_end_margin"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/button_layout_height" />

        <Button
            android:id="@+id/button1"
            style="@style/CarDialogButtonText"
            android:minWidth="@dimen/car_touch_target_size"
            android:paddingStart="@dimen/car_padding_2"
            android:paddingEnd="@dimen/car_padding_2"
            android:background="@drawable/car_dialog_button_background"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/button_layout_height" />
        <Space
            android:id="@+id/spacer"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:visibility="invisible" />
    </com.android.internal.widget.ButtonBarLayout>
</ScrollView>