apps/CtsVerifier/res/drawable/display_cutout_test_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.
  -->

<selector
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape>
            <solid android:color="#ffff0000" />
            <padding android:left="4dp"
                     android:top="4dp"
                     android:right="4dp"
                     android:bottom="4dp" />
            <corners android:radius="4dp" />
        </shape>
    </item>
    <item android:state_focused="true">
        <shape>
            <solid android:color="#ffbfbfbf" />
            <padding android:left="4dp"
                     android:top="4dp"
                     android:right="4dp"
                     android:bottom="4dp" />
            <corners android:radius="4dp" />
        </shape>
    </item>
    <item>
        <shape>
            <solid android:color="#ff7f7f7f" />
            <padding android:left="4dp"
                     android:top="4dp"
                     android:right="4dp"
                     android:bottom="4dp" />
            <corners android:radius="4dp" />
        </shape>
    </item>
</selector>