CardView - media 16:9 and actions

1_item_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/media_image"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:scaleType="centerCrop"
            app:layout_constraintDimensionRatio="H,16:9"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/share_button"
            app:layout_constraintVertical_chainStyle="packed" />

        <ImageButton
            android:id="@+id/favorite_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00FFFFFF"
            android:padding="12dp"
            app:srcCompat="@drawable/ic_favorite_black_24dp"
            app:layout_constraintTop_toTopOf="@+id/bookmark_button"
            app:layout_constraintEnd_toStartOf="@+id/bookmark_button" />

        <ImageButton
            android:id="@+id/bookmark_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00FFFFFF"
            android:padding="12dp"
            app:srcCompat="@drawable/ic_bookmark_black_24dp"
            app:layout_constraintTop_toTopOf="@+id/share_button"
            app:layout_constraintEnd_toStartOf="@+id/share_button" />

        <ImageButton
            android:id="@+id/share_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:background="#00FFFFFF"
            android:padding="12dp"
            app:srcCompat="@drawable/ic_share_black_24dp"
            app:layout_constraintTop_toBottomOf="@+id/media_image"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toBottomOf="parent" />

    </android.support.constraint.ConstraintLayout>

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

2_ic_favorite_black_24dp.xml

<vector android:alpha="0.54" android:height="24dp"
    android:viewportHeight="24.0" android:viewportWidth="24.0"
    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
    <path android:fillColor="#FF000000" android:pathData="M12,21.35l-1.45,-1.32C5.4,15.36 2,12.28 2,8.5 2,5.42 4.42,3 7.5,3c1.74,0 3.41,0.81 4.5,2.09C13.09,3.81 14.76,3 16.5,3 19.58,3 22,5.42 22,8.5c0,3.78 -3.4,6.86 -8.55,11.54L12,21.35z"/>
</vector>

3_ic_bookmark_black_24dp.xml

<vector android:alpha="0.54" android:height="24dp"
    android:viewportHeight="24.0" android:viewportWidth="24.0"
    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
    <path android:fillColor="#FF000000" android:pathData="M17,3H7c-1.1,0 -1.99,0.9 -1.99,2L5,21l7,-3 7,3V5c0,-1.1 -0.9,-2 -2,-2z"/>
</vector>

4_ic_share_black_24dp.xml

<vector android:alpha="0.54" android:height="24dp"
    android:viewportHeight="24.0" android:viewportWidth="24.0"
    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
    <path android:fillColor="#FF000000" android:pathData="M18,16.08c-0.76,0 -1.44,0.3 -1.96,0.77L8.91,12.7c0.05,-0.23 0.09,-0.46 0.09,-0.7s-0.04,-0.47 -0.09,-0.7l7.05,-4.11c0.54,0.5 1.25,0.81 2.04,0.81 1.66,0 3,-1.34 3,-3s-1.34,-3 -3,-3 -3,1.34 -3,3c0,0.24 0.04,0.47 0.09,0.7L8.04,9.81C7.5,9.31 6.79,9 6,9c-1.66,0 -3,1.34 -3,3s1.34,3 3,3c0.79,0 1.5,-0.31 2.04,-0.81l7.12,4.16c-0.05,0.21 -0.08,0.43 -0.08,0.65 0,1.61 1.31,2.92 2.92,2.92 1.61,0 2.92,-1.31 2.92,-2.92s-1.31,-2.92 -2.92,-2.92z"/>
</vector>