car_product/car_ui_portrait/rro/CarUiPortraitNotificationRRO/res/layout/car_notification_actions_view.xml

<?xml version="1.0" encoding="utf-8" ?>
<!--
  ~ Copyright (C) 2021 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.
  -->

<merge xmlns:android="http://schemas.android.com/apk/res/android">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <com.android.car.notification.template.CarNotificationActionButton
            android:id="@+id/action_1"
            style="@style/NotificationActionButton1"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="@dimen/action_button_height"
            android:minWidth="@dimen/action_button_min_width"
            android:paddingBottom="@dimen/action_button_padding_bottom"
            android:paddingTop="@dimen/action_button_padding_top"
            android:visibility="gone"/>

        <com.android.car.notification.template.CarNotificationActionButton
            android:id="@+id/action_2"
            style="@style/NotificationActionButton2"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="@dimen/action_button_height"
            android:layout_marginStart="@dimen/action_button_spacing_start"
            android:minWidth="@dimen/action_button_min_width"
            android:paddingBottom="@dimen/action_button_padding_bottom"
            android:paddingTop="@dimen/action_button_padding_top"
            android:visibility="gone"/>

        <com.android.car.notification.template.CarNotificationActionButton
            android:id="@+id/action_3"
            style="@style/NotificationActionButton3"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="@dimen/action_button_height"
            android:layout_marginStart="@dimen/action_button_spacing_start"
            android:minWidth="@dimen/action_button_min_width"
            android:paddingBottom="@dimen/action_button_padding_bottom"
            android:paddingTop="@dimen/action_button_padding_top"
            android:visibility="gone"/>

    </LinearLayout>
</merge>