session-android/res/layout/media_overview_gallery_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:app="http://schemas.android.com/apk/res-auto"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@drawable/default_session_background">

    <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/media_grid"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="vertical" />

    <TextView android:id="@+id/no_images"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:textSize="@dimen/medium_font_size"
              android:gravity="center"
              android:textColor="@color/text"
              android:visibility="gone"
              android:text="@string/media_overview_activity__no_media" />

</RelativeLayout>