car/res/layout/preference_dropdown_material_car.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright 2018 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="wrap_content"
    android:minHeight="?android:attr/listPreferredItemHeightSmall"
    android:gravity="center_vertical"
    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
    android:paddingVertical="@dimen/car_preference_list_margin"
    android:background="@drawable/car_card_ripple_background"
    android:focusable="true"
    android:orientation="horizontal">

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="0dp"
        android:layout_weight="0"
        android:layout_height="wrap_content"
        android:visibility="invisible" />

    <androidx.preference.internal.PreferenceImageView
        android:id="@android:id/icon"
        android:layout_width="@dimen/car_drawer_list_item_icon_size"
        android:layout_height="@dimen/car_drawer_list_item_icon_size" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingTop="@dimen/car_preference_list_margin"
        android:paddingBottom="@dimen/car_preference_list_margin">

        <TextView
            android:id="@android:id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="@style/TextAppearance.Car.Body1" />

        <TextView
            android:id="@android:id/summary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="@style/TextAppearance.Car.Body2" />
    </LinearLayout>

</LinearLayout>