newFny/app/src/main/res/layout/activity_simple_play.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_play"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000">

    <com.shuyu.gsyvideoplayer.video.StandardGSYVideoPlayer
        android:id="@+id/video_player"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true" />

</RelativeLayout>