res/layout/intro_animation_captions.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.
 */
-->

<!--Visible part of the text strip acting as a viewport.-->
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/text_animation_viewport"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="@dimen/spacer_24">
    <!--Wider strip containing all titles. Only partially visible.-->
    <!--Overlap 50% between titles.-->
    <!--First title appearing at beginning, and at the end for animation continuity.-->
    <!--Visibility and moving in viewport managed by animations.-->
    <!-- Widths are intentionally wrap_width - they are meant to be overridden dynamically. -->
    <FrameLayout
        android:id="@+id/text_master"
        android:layout_width="wrap_content"
        android:layout_height="match_parent">
        <TextView
            android:id="@+id/text_0"
            style="@style/InfoAnimationTitle"/>
        <TextView
            android:id="@+id/text_1"
            android:alpha="0"
            style="@style/InfoAnimationTitle"/>
        <TextView
            android:id="@+id/text_2"
            android:alpha="0"
            style="@style/InfoAnimationTitle"/>
        <TextView
            android:id="@+id/text_3"
            android:alpha="0"
            style="@style/InfoAnimationTitle"/>
    </FrameLayout>
</FrameLayout>