NewPipe-app-android/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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <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"
        android:visibility="gone"
        tools:visibility="visible" />

    <!--ERROR PANEL-->
    <include
        android:id="@+id/error_panel"
        layout="@layout/error_retry"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_marginTop="50dp"
        android:visibility="gone"
        tools:visibility="visible" />

</RelativeLayout>