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

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/media_grid_holder"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="@dimen/activity_margin">

    <com.simplemobiletools.commons.views.MyRecyclerView
        android:id="@+id/media_grid"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="none"
        app:layoutManager="android.support.v7.widget.GridLayoutManager"
        app:spanCount="@integer/media_columns_vertical_scroll"/>

    <com.simplemobiletools.commons.views.FastScroller
        android:id="@+id/media_vertical_fastscroller"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:paddingLeft="@dimen/normal_margin"
        android:paddingStart="@dimen/normal_margin">

        <include layout="@layout/fastscroller_handle_vertical"/>

    </com.simplemobiletools.commons.views.FastScroller>

    <com.simplemobiletools.commons.views.FastScroller
        android:id="@+id/media_horizontal_fastscroller"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:paddingTop="@dimen/normal_margin">

        <include layout="@layout/fastscroller_handle_horizontal"/>

    </com.simplemobiletools.commons.views.FastScroller>
</RelativeLayout>