<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground"
        app:cardCornerRadius="2dp"
        app:cardElevation="2dp">

        <android.support.percent.PercentFrameLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v4.view.ViewPager
                android:id="@+id/view_pager"
                app:layout_aspectRatio="150%"
                app:layout_widthPercent="100%" />

        </android.support.percent.PercentFrameLayout>

    </android.support.v7.widget.CardView>

Итем вьюпейджера:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/photo"
        android:scaleType="centerCrop"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />

</FrameLayout>