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photo_item.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable name="data" type="com.example.android.unsplash.data.model.Photo" />
    </data>
    <FrameLayout android:layout_width="match_parent"
                 android:layout_height="@dimen/image_height"
                 android:stateListAnimator="@animator/raise"
                 android:foreground="@drawable/grey_ripple"
                 android:transitionGroup="true">
        <ImageView
                android:id="@+id/photo"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="centerCrop"
                android:transitionName="@{@string/transition_photo + data.id}" />

<TextView android:id="@+id/author"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:text="@{data.author}"
                  android:layout_gravity="bottom|end"
                  android:textColor="@color/placeholder"
                  android:lines="1"
                  android:paddingTop="@dimen/padding_small"
                  android:paddingBottom="@dimen/padding_small"
                  android:paddingStart="@dimen/padding_normal"
                  android:paddingEnd="@dimen/padding_normal"
                  android:background="@color/author_background"
                  android:transitionName="@{@string/transition_author + data.id}" />
    </FrameLayout>
</layout>