testapps/ImsTestService/res/layout/ims_connection.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2017 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
  -->
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_gravity="center"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/connection_info"
    card_view:cardCornerRadius="4dp"
    card_view:cardElevation="4dp"
    card_view:cardUseCompatPadding="true">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >
        <TextView
            android:id="@+id/reg_main_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" android:text="@string/features_main_text"/>
        <CheckBox
            android:id="@+id/reg_check_mmtel"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" android:text="@string/features_check_mmtel"/>
        <CheckBox
            android:id="@+id/reg_check_rcs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" android:text="@string/features_check_rcs"/>
        </LinearLayout>
</android.support.v7.widget.CardView>