car_product/overlay-visual/frameworks/base/core/res/res/drawable/car_radio_button_checked.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright 2021 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">
      <item
        android:bottom="@dimen/car_radio_button_focus_ring_padding"
        android:gravity="center"
        android:left="@dimen/car_radio_button_focus_ring_padding"
        android:right="@dimen/car_radio_button_focus_ring_padding"
        android:top="@dimen/car_radio_button_focus_ring_padding">
        <shape android:shape="oval">
            <size
                android:width="@dimen/car_radio_button_outer_ring_size"
                android:height="@dimen/car_radio_button_outer_ring_size" />
            <stroke
                android:width="@dimen/car_radio_button_outer_ring_stroke_width"
                android:color="@color/car_selection_controls_checked_color"/>
        </shape>
    </item>
    <item android:gravity="center">
        <shape
            android:shape="oval">
            <size
                android:width="@dimen/car_radio_button_inner_circle_size"
                android:height="@dimen/car_radio_button_inner_circle_size" />
            <solid android:color="@color/car_selection_controls_checked_color"/>
        </shape>
    </item>
    <item
        android:drawable="@drawable/car_radio_button_focus_highlight"
        android:gravity="center" />
</layer-list>