komikku/app/src/main/res/layout/library_controller.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:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/library_pager"/>

    <ProgressBar
        android:id="@+id/library_progress"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone"
        tools:visibility="visible" />

    <eu.kanade.tachiyomi.widget.EmptyView
        android:id="@+id/empty_view"
        android:visibility="gone"
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:layout_height="wrap_content"/>

</FrameLayout>