fedilab-Android-App/app/src/main/res/layouts/mastodon/layout/fragment_slide_media.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/transparent">

    <RelativeLayout
        android:id="@+id/media_fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/black">
        <!-- Main Loader -->
        <RelativeLayout
            android:id="@+id/loader"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:gravity="center">

            <ProgressBar
                android:id="@+id/pbar_inf"
                style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:indeterminate="false"
                android:max="100"
                android:progress="0" />

            <TextView
                android:id="@+id/loader_progress"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:gravity="center"
                android:textSize="12sp" />
        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/videoLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/black"
            android:visibility="gone" />

        <FrameLayout
            android:id="@+id/media_picture_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerInParent="true">
            <!-- Description is set dynamically -->
            <com.github.chrisbanes.photoview.PhotoView
                android:id="@+id/media_picture"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:adjustViewBounds="true"
                android:visibility="gone" />
        </FrameLayout>


        <com.google.android.exoplayer2.ui.PlayerView
            android:id="@+id/media_video"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerInParent="true"
            android:visibility="gone" />

    </RelativeLayout>
</FrameLayout>