res/layout/intro_animation.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/**
 * Copyright (C) 2016 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 to provide contentDescription for accessibility.-->
<!--No option 'yesButHideDescendants' for importantForAccessibility attribute.-->
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/animation_top_level_frame"
    android:layout_gravity="center"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="vertical"
        android:importantForAccessibility="noHideDescendants">

        <ImageView
            android:id="@+id/animated_info"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scaleType="fitCenter"/>

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

    </LinearLayout>
</FrameLayout>