CardView - media 16:9, primary text, subtext, actions and expandable supporting text

1_item_media16x9_primarytext_subtext_actions_supportingtext.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/primary_text"
            app:layout_constraintVertical_chainStyle="packed" />

        <TextView
            android:id="@+id/primary_text"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="24dp"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp"
            android:textAppearance="@style/TextAppearance.AppCompat.Headline"
            android:textColor="#DE000000"
            app:layout_constraintTop_toBottomOf="@+id/media_image"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/sub_text" />

        <TextView
            android:id="@+id/sub_text"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp"
            android:textAppearance="@style/TextAppearance.AppCompat.Body1"
            android:textColor="#8A000000"
            app:layout_constraintTop_toBottomOf="@+id/primary_text"
            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_marginTop="16dp"
            android:layout_marginStart="8dp"
            android:minWidth="0dp"
            android:paddingStart="8dp"
            android:paddingEnd="8dp"
            android:textColor="#DE000000"
            app:layout_constraintTop_toBottomOf="@+id/sub_text"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/supporting_text" />

        <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_toTopOf="@+id/action_button_1"
            app:layout_constraintStart_toEndOf="@+id/action_button_1" />

        <ImageButton
            android:id="@+id/expand_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="0dp"
            android:background="#00FFFFFF"
            android:padding="6dp"
            app:srcCompat="@drawable/ic_expand_more_black_36dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toBottomOf="@+id/action_button_1" />

        <TextView
            android:id="@+id/supporting_text"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp"
            android:layout_marginBottom="24dp"
            android:lineSpacingExtra="8dp"
            android:textAppearance="@style/TextAppearance.AppCompat.Body1"
            android:textColor="#DE000000"
            android:visibility="gone" <!-- To expand you set visibility to "visible". To collapse you set visibility to "gone" -->
            app:layout_constraintTop_toBottomOf="@+id/action_button_1"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"/>

    </android.support.constraint.ConstraintLayout>

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

2_ic_expand_less_black_36dp.xml

<vector android:alpha="0.87" android:height="36dp"
    android:viewportHeight="24.0" android:viewportWidth="24.0"
    android:width="36dp" xmlns:android="http://schemas.android.com/apk/res/android">
    <path android:fillColor="#FF000000" android:pathData="M12,8l-6,6 1.41,1.41L12,10.83l4.59,4.58L18,14z"/>
</vector>

3_ic_expand_more_black_36dp.xml

<vector android:alpha="0.87" android:height="36dp"
    android:viewportHeight="24.0" android:viewportWidth="24.0"
    android:width="36dp" xmlns:android="http://schemas.android.com/apk/res/android">
    <path android:fillColor="#FF000000" android:pathData="M16.59,8.59L12,13.17 7.41,8.59 6,10l6,6 6,-6z"/>
</vector>