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

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

    <androidx.core.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true"
        android:keepScreenOn="true">

        <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" />


            <ImageView
                android:id="@+id/media_prev"
                android:layout_width="30dp"
                android:layout_height="50dp"
                android:layout_alignParentStart="true"
                android:layout_centerVertical="true"
                android:layout_marginStart="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:layout_marginEnd="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginBottom="5dp"
                android:background="@color/transparent_grey"
                android:contentDescription="@string/previous"
                android:src="@drawable/ic_baseline_first_page_24"
                android:visibility="gone"
                app:tint="@color/white" />

            <ImageView
                android:id="@+id/media_next"
                android:layout_width="30dp"
                android:layout_height="50dp"
                android:layout_alignParentEnd="true"
                android:layout_centerVertical="true"
                android:layout_marginStart="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:layout_marginEnd="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginBottom="5dp"
                android:background="@color/transparent_grey"
                android:contentDescription="@string/next"
                android:src="@drawable/ic_baseline_last_page_24"
                android:visibility="gone" />


            <TextView
                android:id="@+id/message_ready"
                android:layout_width="match_parent"
                android:layout_height="40dp"
                android:layout_alignBottom="@+id/media_picture_container"
                android:layout_marginBottom="40dp"
                android:background="@drawable/media_message_border"
                android:gravity="center"
                android:text="@string/media_ready"
                android:textSize="14sp"
                android:visibility="gone" />
        </RelativeLayout>
    </androidx.core.widget.NestedScrollView>
</FrameLayout>