CardView - avatar, media 16:9 and action buttons

1_item_avatar_media16x9_actions.xml

<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    style="@style/CardView.Light"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp">

    <android.support.constraint.ConstraintLayout
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/avatar_image"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_marginTop="12dp"
            android:layout_marginStart="12dp"
            android:padding="4dp"
            android:scaleType="centerCrop"
            app:srcCompat="@drawable/ic_avatar_40dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/media_image"
            app:layout_constraintVertical_chainStyle="packed" />

        <TextView
            android:id="@+id/title_text"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="4dp"
            android:layout_marginStart="12dp"
            android:layout_marginEnd="16dp"
            android:textAppearance="@style/TextAppearance.AppCompat.Body2"
            android:textColor="#DE000000"
            app:layout_constraintTop_toTopOf="@+id/avatar_image"
            app:layout_constraintStart_toEndOf="@+id/avatar_image"
            app:layout_constraintEnd_toEndOf="parent" />

        <TextView
            android:id="@+id/subtitle_text"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="12dp"
            android:layout_marginEnd="16dp"
            android:layout_marginBottom="4dp"
            android:textAppearance="@style/TextAppearance.AppCompat.Body2"
            android:textColor="#8A000000"
            app:layout_constraintStart_toEndOf="@+id/avatar_image"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toBottomOf="@+id/avatar_image" />

        <ImageView
            android:id="@+id/media_image"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_marginTop="12dp"
            android:scaleType="centerCrop"
            app:layout_constraintDimensionRatio="H,16:9"
            app:layout_constraintTop_toBottomOf="@+id/avatar_image"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/action_button_1" />

        <Button
            style="@style/Widget.AppCompat.Button.Borderless"
            android:id="@+id/action_button_1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:minWidth="0dp"
            android:paddingStart="8dp"
            android:paddingEnd="8dp"
            android:textColor="#DE000000"
            app:layout_constraintTop_toBottomOf="@+id/media_image"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/action_button_2" />

        <Button
            style="@style/Widget.AppCompat.Button.Borderless"
            android:id="@+id/action_button_2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:minWidth="0dp"
            android:paddingStart="8dp"
            android:paddingEnd="8dp"
            android:textColor="#DE000000"
            app:layout_constraintTop_toBottomOf="@+id/action_button_1"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"/>

    </android.support.constraint.ConstraintLayout>

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

ic_avatar_40dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="40dp"
        android:height="40dp"
        android:viewportWidth="40.0"
        android:viewportHeight="40.0">
    <path
        android:pathData="M20,20m-20,0a20,20 0,1 1,40 0a20,20 0,1 1,-40 0"
        android:fillColor="@android:color/darker_gray" />
</vector>