YouMap/lesson03/src/main/res/layout/activity_gvr_video.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="io.hsiao.lesson03.PanoActivity">

    <com.google.vr.sdk.widgets.video.VrVideoView
        android:id="@+id/gvr_videoview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></com.google.vr.sdk.widgets.video.VrVideoView>
</android.support.constraint.ConstraintLayout>