RetroMusicPlayer/app/src/main/res/layout/volume_controls.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/volumeFragmentContainer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="0"
    android:paddingStart="8dp"
    android:paddingEnd="8dp" >

   <!-- <fragment
        android:id="@+id/volumeFragment"
        android:name="code.name.monkey.retromusic.ui.fragments.VolumeFragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        tools:layout="@layout/fragment_volume" />-->
</FrameLayout>