Threema-Android-mirror/app/src/main/res/layout/item_media_attach_gallery.xml

<?xml version="1.0" encoding="utf-8"?>
<ch.threema.app.ui.CheckableFrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	android:id="@+id/content_frame"
	android:padding="@dimen/media_gallery_grid_item_padding"
	android:background="@android:color/transparent"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:contentDescription="@string/attach_picture">

	<FrameLayout
		android:id="@+id/media_frame"
		android:layout_width="match_parent"
		android:layout_height="match_parent"
		android:duplicateParentState="true"
		android:stateListAnimator="@animator/selector_gallery_image">

		<ch.threema.app.ui.SquareImageView
			android:id="@+id/thumbnail_view"
			android:layout_width="match_parent"
			android:layout_height="match_parent"
			android:duplicateParentState="true"
			android:scaleType="centerCrop"/>

		<ImageView
			android:id="@+id/load_error_indicator"
			android:layout_width="@dimen/broken_image_icon_size"
			android:layout_height="@dimen/broken_image_icon_size"
			android:contentDescription="@string/error_unable_loading_media_thumb"
			android:layout_gravity="center"
			android:visibility="gone"
			app:srcCompat="@drawable/ic_baseline_broken_image_24"
			app:tint="?attr/colorOnSurface"
			/>

		<LinearLayout
			android:id="@+id/animated_format_label_container"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_gravity="bottom"
			android:background="@color/mime_type_marker_background"
			android:gravity="left"
			android:orientation="horizontal"
			android:visibility="gone">

			<ImageView
				android:id="@+id/animated_format_label_icon"
				android:layout_width="wrap_content"
				android:layout_height="wrap_content"
				android:contentDescription="@string/attach_gif"
				app:srcCompat="@drawable/ic_gif_24dp"
				app:tint="@android:color/white" />

		</LinearLayout>

		<LinearLayout
			android:id="@+id/video_marker_container"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_gravity="bottom"
			android:background="@color/mime_type_marker_background"
			android:gravity="center"
			android:paddingLeft="4dp"
			android:paddingRight="4dp"
			android:orientation="horizontal"
			android:visibility="gone">

			<ImageView
				android:id="@+id/video_icon"
				android:layout_width="wrap_content"
				android:layout_height="wrap_content"
				android:layout_marginRight="4dp"
				android:contentDescription="@string/attach_video"
				app:srcCompat="@drawable/ic_videocam_black_24dp"
				app:tint="@android:color/white" />

			<TextView
				android:id="@+id/video_duration_text"
				android:layout_width="wrap_content"
				android:layout_height="wrap_content"
				android:textColor="@android:color/white"
				android:textSize="12sp"/>

		</LinearLayout>

	</FrameLayout>

	<ch.threema.app.ui.CheckableView
		android:id="@+id/check_box"
		android:layout_width="24dp"
		android:layout_height="24dp"
		android:layout_gravity="top|left"
		android:layout_margin="6dp"
		android:background="@drawable/selector_grid_checkbox_invisible"
		android:duplicateParentState="true"/>

</ch.threema.app.ui.CheckableFrameLayout>