core/res/res/layout/notification_template_material_big_picture.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2014 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
  -->

<FrameLayout 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="match_parent"
    android:tag="bigPicture"
    >
    <ImageView
        android:id="@+id/big_picture"
        android:layout_width="match_parent"
        android:layout_height="192dp"
        android:layout_marginTop="64dp"
        android:layout_gravity="bottom"
        android:scaleType="centerCrop"
        />
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="6dp"
        android:layout_marginTop="64dp"
        android:scaleType="fitXY"
        android:src="@drawable/title_bar_shadow"
        />
    <include layout="@layout/notification_template_material_base"
        android:layout_width="match_parent"
        android:layout_height="64dp"
        />
  <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="208dp"
        android:paddingStart="@dimen/notification_large_icon_width"
        android:layout_gravity="bottom"
        android:background="#CCEEEEEE"
        >
        <include
            layout="@layout/notification_material_action_list"
            android:id="@+id/actions"
            android:layout_gravity="bottom"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
    </FrameLayout>
</FrameLayout>