NewPipe/app/src/main/res/layout/fragment_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"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:title="@string/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"
        tools:listitem="@layout/stream_item"/>

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