res/drawable/hvac_decrease_button.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.
  -->

<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:aapt="http://schemas.android.com/aapt">
    <item android:gravity="center"
          android:width="@dimen/system_bar_icon_drawing_size"
          android:height="@dimen/system_bar_icon_drawing_size">
        <aapt:attr name="android:drawable">
            <shape android:shape="oval">
                <size
                    android:width="@dimen/system_bar_icon_drawing_size"
                    android:height="@dimen/system_bar_icon_drawing_size"/>
                <solid
                    android:color="@color/hvac_temperature_adjust_button_color"/>
            </shape>
        </aapt:attr>
    </item>
    <item android:gravity="center"
          android:width="@dimen/system_bar_icon_drawing_size"
          android:height="@dimen/system_bar_icon_drawing_size">
        <aapt:attr name="android:drawable">
            <vector android:width="@dimen/system_bar_icon_drawing_size"
                    android:height="@dimen/system_bar_icon_drawing_size"
                    android:viewportWidth="24.0"
                    android:viewportHeight="24.0">
                <path
                    android:fillColor="@color/hvac_temperature_decrease_arrow_color"
                    android:pathData="M14,7l-5,5 5,5V7z"/>
            </vector>
        </aapt:attr>
    </item>
    <item>
        <aapt:attr name="android:drawable">
            <ripple android:color="?android:attr/colorControlHighlight"/>
        </aapt:attr>
    </item>
</layer-list>