slices/view/src/main/res/layout/abc_slice_message.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright 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.
  -->
<androidx.app.slice.widget.MessageView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="12dp"
    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
    android:background="?android:attr/activatedBackgroundIndicator"
    android:clipToPadding="false">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <LinearLayout
            android:id="@+id/abc_icon_frame"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="-4dp"
            android:gravity="start|center_vertical"
            android:orientation="horizontal"
            android:paddingEnd="12dp"
            android:paddingTop="4dp"
            android:paddingBottom="4dp">
            <!-- TODO: Support text source -->
            <ImageView
                android:id="@android:id/icon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:maxWidth="48dp"
                android:maxHeight="48dp" />
        </LinearLayout>

        <TextView android:id="@android:id/summary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignStart="@android:id/title"
            android:textAppearance="?android:attr/textAppearanceListItem"
            android:maxLines="10" />

    </LinearLayout>
</androidx.app.slice.widget.MessageView>