nextcloud-talk-android/app/src/main/res/layout/shared_item_grid.xml

<?xml version="1.0" encoding="utf-8"?><!--
  ~ Nextcloud Talk application
  ~
  ~ @author Tim Krüger
  ~ @author Marcel Hibbe
  ~ Copyright (C) 2022 Tim Krüger <t@timkrueger.me>
  ~ Copyright (C) 2022 Marcel Hibbe <dev@mhibbe.de>
  ~
  ~ This program is free software: you can redistribute it and/or modify
  ~ it under the terms of the GNU General Public License as published by
  ~ the Free Software Foundation, either version 3 of the License, or
  ~ at your option) any later version.
  ~
  ~ This program is distributed in the hope that it will be useful,
  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ~ GNU General Public License for more details.
  ~
  ~ You should have received a copy of the GNU General Public License
  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  -->

<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="wrap_content">

    <FrameLayout
        android:id="@+id/preview_container"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginStart="2dp"
        android:layout_marginEnd="2dp"
        android:adjustViewBounds="true"
        app:layout_alignSelf="flex_start"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_flexGrow="1"
        app:layout_wrapBefore="true">

        <ImageView
            android:id="@+id/image"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="4dp"
            tools:ignore="ContentDescription" />

        <ProgressBar
            android:id="@+id/progress_bar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:visibility="gone" />

    </FrameLayout>

</androidx.constraintlayout.widget.ConstraintLayout>