data/res/layout/notification_template_material_call.xml

<?xml version="1.0" encoding="utf-8"?><!--
  ~ Copyright (C) 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
  -->
<com.android.internal.widget.CallLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/status_bar_latest_event_content"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clipChildren="false"
    android:tag="call"
    android:theme="@style/Theme.DeviceDefault.Notification"
    >

    <!-- CallLayout shares visual appearance with ConversationLayout, so shares layouts -->
    <include layout="@layout/notification_template_conversation_icon_container" />

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="88dp"
        android:orientation="horizontal"
        >

        <LinearLayout
            android:id="@+id/notification_main_column"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginStart="@dimen/conversation_content_start"
            android:orientation="vertical"
            android:minHeight="68dp"
            >

            <include
                layout="@layout/notification_template_conversation_header"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                />

            <include layout="@layout/notification_template_text" />

        </LinearLayout>

        <FrameLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:minWidth="@dimen/notification_content_margin_end"
            >

            <include
                layout="@layout/notification_expand_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                />

        </FrameLayout>

    </LinearLayout>

</com.android.internal.widget.CallLayout>