session-android/res/layout/thumbnail_view.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageView android:id="@+id/thumbnail_image"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
               android:adjustViewBounds="true"
               android:scaleType="fitCenter"
               android:contentDescription="@string/conversation_item__mms_image_description"
               android:layout_margin="@dimen/media_bubble_border_width" />

    <ViewStub android:id="@+id/progress_wheel_stub"
              android:layout_width="70dp"
              android:layout_height="70dp"
              android:layout_gravity="center"
              android:layout="@layout/thumbnail_view_progress_wheel" />

    <ViewStub android:id="@+id/remove_button_stub"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_gravity="top|right"
              android:layout="@layout/thumbnail_view_remove_button" />

    <ImageButton android:id="@+id/download_button"
                 android:layout_width="70dp"
                 android:layout_height="70dp"
                 android:layout_gravity="center"
                 android:background="@drawable/progress_background"
                 android:src="@drawable/ic_file_download_white_36dp"
                 android:visibility="gone" />
</merge>