car-apps-common/res/layout/car_paged_scrollbar_buttons.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2019 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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

  <ImageButton
      android:id="@+id/page_up"
      android:layout_width="@dimen/car_scroll_bar_button_size"
      android:layout_height="@dimen/car_scroll_bar_button_size"
      android:background="@drawable/car_button_ripple_background"
      android:contentDescription="@string/scroll_bar_page_up_button"
      android:focusable="false"
      android:hapticFeedbackEnabled="false"
      android:src="@drawable/ic_up"
      android:scaleType="centerInside" />

  <!-- View height is dynamically calculated during layout. -->
  <View
      android:id="@+id/scrollbar_thumb"
      android:layout_width="@dimen/car_scroll_bar_thumb_width"
      android:layout_height="0dp"
      android:layout_gravity="center_horizontal"
      android:background="@drawable/car_scrollbar_thumb" />

  <ImageButton
      android:id="@+id/page_down"
      android:layout_width="@dimen/car_scroll_bar_button_size"
      android:layout_height="@dimen/car_scroll_bar_button_size"
      android:background="@drawable/car_button_ripple_background"
      android:contentDescription="@string/scroll_bar_page_down_button"
      android:focusable="false"
      android:hapticFeedbackEnabled="false"
      android:src="@drawable/ic_down"
      android:scaleType="centerInside" />
</LinearLayout>