DroidFS/app/src/main/res/layout/activity_video_player.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:gravity="center"
    android:layoutDirection="ltr"
    android:background="@color/fullScreenBackgroundColor">

    <com.google.android.exoplayer2.ui.PlayerView
        android:id="@+id/video_player"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        app:show_shuffle_button="true"
        app:repeat_toggle_modes="all|one"/>

    <ImageButton
        android:id="@+id/rotate_button"
        style="@style/ExoMediaButton"
        android:layout_gravity="top|end"
        android:layout_marginTop="15dp"
        android:src="@drawable/icon_screen_rotation"
        app:tint="@color/white"/>
</FrameLayout>