FossifyGallery/app/src/main/res/layout/pager_photo_item.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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/photo_holder"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.alexvasilkov.gestures.GestureImageView
        android:id="@+id/gestures_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.alexvasilkov.gestures.GestureFrameLayout
        android:id="@+id/gif_view_frame"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:visibility="gone">

        <pl.droidsonroids.gif.GifTextureView
            android:id="@+id/gif_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitCenter" />

    </com.alexvasilkov.gestures.GestureFrameLayout>

    <com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
        android:id="@+id/subsampling_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone" />

    <ImageView
        android:id="@+id/panorama_outline"
        android:layout_width="@dimen/play_outline_size_big"
        android:layout_height="@dimen/play_outline_size_big"
        android:layout_centerInParent="true"
        android:contentDescription="@null"
        android:padding="20dp"
        android:src="@drawable/ic_panorama_outline"
        android:visibility="gone" />

    <TextView
        android:id="@+id/photo_details"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="@dimen/small_margin"
        android:layout_marginRight="@dimen/small_margin"
        android:background="@drawable/extended_details_background"
        android:padding="@dimen/small_margin"
        android:textColor="@color/theme_dark_text_color"
        android:textSize="@dimen/smaller_text_size"
        android:visibility="gone"
        tools:text="My image\nAnother line" />

    <com.simplemobiletools.gallery.pro.views.MediaSideScroll
        android:id="@+id/photo_brightness_controller"
        android:layout_width="@dimen/media_side_slider_width"
        android:layout_height="match_parent"
        android:layout_alignParentStart="true" />

    <TextView
        android:id="@+id/slide_info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="120dp"
        android:alpha="0"
        android:background="@drawable/black_rounded_background"
        android:gravity="center"
        android:paddingLeft="@dimen/activity_margin"
        android:paddingTop="@dimen/medium_margin"
        android:paddingRight="@dimen/activity_margin"
        android:paddingBottom="@dimen/medium_margin"
        android:textColor="@android:color/white"
        android:textSize="@dimen/extra_big_text_size" />

    <RelativeLayout
        android:id="@+id/photo_portrait_stripe_wrapper"
        android:layout_width="match_parent"
        android:layout_height="@dimen/portrait_photos_stripe_height"
        android:layout_alignParentBottom="true"
        android:visibility="invisible">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/photo_portrait_stripe"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:overScrollMode="never"
            app:layoutManager="com.simplemobiletools.commons.views.MyLinearLayoutManager" />

    </RelativeLayout>

    <com.simplemobiletools.gallery.pro.views.InstantItemSwitch
        android:id="@+id/instant_prev_item"
        android:layout_width="1dp"
        android:layout_height="match_parent" />

    <com.simplemobiletools.gallery.pro.views.InstantItemSwitch
        android:id="@+id/instant_next_item"
        android:layout_width="1dp"
        android:layout_height="match_parent"
        android:layout_alignParentEnd="true" />

</RelativeLayout>