car-ui-lib/referencedesign/res/drawable/car_ui_toolbar_menu_item_icon_ripple.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~
  ~ Copyright (C) 2019 Google Inc.
  ~
  ~ 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.
  ~
 -->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_pressed="true">
        <shape android:shape="oval">
            <solid android:color="#8A94CBFF"/>
            <stroke android:width="4dp"
                    android:color="#94CBFF"/>
            <size android:width="48dp"
                  android:height="48dp"/>
        </shape>
    </item>
    <item android:state_focused="true">
        <shape android:shape="oval">
            <solid android:color="#3D94CBFF"/>
            <stroke android:width="8dp"
                    android:color="#94CBFF"/>
            <size android:width="48dp"
                  android:height="48dp"/>
        </shape>
    </item>
    <item>
        <ripple android:color="#27ffffff">
            <item android:id="@android:id/mask">
                <shape android:shape="oval">
                    <solid android:color="#FFFFFF"/>
                </shape>
            </item>
        </ripple>
    </item>
</selector>