LibreTube/app/src/main/res/layout/fragment_player.xml

<?xml version="1.0" encoding="utf-8"?>
<xyz.btcland.libretube.SingleViewTouchableMotionLayout 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"
    app:layoutDescription="@xml/player_scene"
    tools:context=".PlayerFragment"
    android:background="@android:color/transparent"
    android:id="@+id/playerMotionLayout"
    >

    <ScrollView
        android:id="@+id/scrollView2"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/main_container"
        android:background="@color/white"

        >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"

            >

            <TextView
                android:id="@+id/textTest"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text=""

                />
        </LinearLayout>
    </ScrollView>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/main_container"
        android:layout_width="match_parent"
        android:layout_height="350dp"
        android:background="#FFFFFF"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </androidx.constraintlayout.widget.ConstraintLayout>

    <xyz.btcland.libretube.CustomExoPlayerView
        android:id="@+id/player"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:scaleType="centerCrop"
        app:layout_constraintBottom_toBottomOf="@id/main_container"
        app:layout_constraintStart_toStartOf="@id/main_container"
        app:layout_constraintTop_toTopOf="@id/main_container"

        />

    <ImageView
        android:id="@+id/close_imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:alpha="0"
        app:layout_constraintBottom_toBottomOf="@id/main_container"
        app:layout_constraintEnd_toEndOf="@id/main_container"
        app:layout_constraintTop_toTopOf="@id/main_container"
        android:src="@drawable/ic_close"
        android:visibility="gone"
        />

    <ImageView
        android:id="@+id/play_imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="24dp"
        android:alpha="0"
        android:src="@drawable/ic_play"
        app:layout_constraintBottom_toBottomOf="@+id/close_imageView"
        app:layout_constraintEnd_toStartOf="@+id/close_imageView"
        app:layout_constraintTop_toTopOf="@+id/close_imageView"
        android:visibility="gone"
        />

    <TextView
        android:id="@+id/title_textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="12dp"
        android:alpha="0"
        android:ellipsize="end"
        android:maxLines="1"
        app:layout_constraintBottom_toBottomOf="@+id/play_imageView"
        app:layout_constraintEnd_toStartOf="@+id/play_imageView"
        app:layout_constraintStart_toEndOf="@+id/player"
        app:layout_constraintTop_toTopOf="@+id/play_imageView" />

</xyz.btcland.libretube.SingleViewTouchableMotionLayout>