NewPipe/app/src/main/res/layout/activity_channel.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:title="Channel">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/channel_streams_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?android:windowBackground"
        android:scrollbars="vertical"/>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/channel_loading">
        <ProgressBar android:id="@+id/progressBar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:indeterminate="true"/>
    </RelativeLayout>
</RelativeLayout>