FossifyGallery/app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/directories_holder"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.simplemobiletools.gallery.views.MyScalableRecyclerView
        android:id="@+id/directories_grid"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="vertical"
        app:layoutManager="android.support.v7.widget.GridLayoutManager"
        app:spanCount="@integer/directory_columns"/>

</android.support.v4.widget.SwipeRefreshLayout>