Customizing the default Content Card feed

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public class DefaultContentCardsUpdateHandler implements IContentCardsUpdateHandler {

  // Interface that must be implemented and provided as a public CREATOR
  // field that generates instances of your Parcelable class from a Parcel.
  public static final Parcelable.Creator<DefaultContentCardsUpdateHandler> CREATOR = new Parcelable.Creator<DefaultContentCardsUpdateHandler>() {
    public DefaultContentCardsUpdateHandler createFromParcel(Parcel in) {
      return new DefaultContentCardsUpdateHandler();
    }

    public DefaultContentCardsUpdateHandler[] newArray(int size) {
      return new DefaultContentCardsUpdateHandler[size];
    }
  };

  @Override
  public List<Card> handleCardUpdate(ContentCardsUpdatedEvent event) {
    List<Card> sortedCards = event.getAllCards();
    // Sort by pinned, then by the 'updated' timestamp descending
    // Pinned before non-pinned
    Collections.sort(sortedCards, new Comparator<Card>() {
      @Override
      public int compare(Card cardA, Card cardB) {
        // A displays above B
        if (cardA.getIsPinned() && !cardB.getIsPinned()) {
          return -1;
        }

        // B displays above A
        if (!cardA.getIsPinned() && cardB.getIsPinned()) {
          return 1;
        }

        // At this point, both A & B are pinned or both A & B are non-pinned
        // A displays above B since A is newer
        if (cardA.getUpdated() > cardB.getUpdated()) {
          return -1;
        }

        // B displays above A since A is newer
        if (cardA.getUpdated() < cardB.getUpdated()) {
          return 1;
        }

        // At this point, every sortable field matches so keep the natural ordering
        return 0;
      }
    });

    return sortedCards;
  }

  // Parcelable interface method
  @Override
  public int describeContents() {
    return 0;
  }

  // Parcelable interface method
  @Override
  public void writeToParcel(Parcel dest, int flags) {
    // No state is kept in this class so the parcel is left unmodified
  }
}

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private IContentCardsUpdateHandler getUpdateHandlerForFeedType(final String desiredFeedType) {
  return new IContentCardsUpdateHandler() {
    @Override
    public List<Card> handleCardUpdate(ContentCardsUpdatedEvent event) {
      // Use the default card update handler for a first
      // pass at sorting the cards. This is not required
      // but is done for convenience.
      final List<Card> cards = new DefaultContentCardsUpdateHandler().handleCardUpdate(event);

      final Iterator<Card> cardIterator = cards.iterator();
      while (cardIterator.hasNext()) {
        final Card card = cardIterator.next();

        // Make sure the card has our custom KVP
        // from the dashboard with the key "feed_type"
        if (card.getExtras().containsKey("feed_type")) {
          final String feedType = card.getExtras().get("feed_type");
          if (!desiredFeedType.equals(feedType)) {
            // The card has a feed type, but it doesn't match
            // our desired feed type, remove it.
            cardIterator.remove();
          }
        } else {
          // The card doesn't have a feed
          // type at all, remove it
          cardIterator.remove();
        }
      }

      // At this point, all of the cards in this list have
      // a feed type that explicitly matches the value we put
      // in the dashboard.
      return cards;
    }
  };
}

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// We want a Content Cards feed that only shows "Transactional" cards.
ContentCardsFragment customContentCardsFragment = new ContentCardsFragment();
customContentCardsFragment.setContentCardUpdateHandler(getUpdateHandlerForFeedType("Transactional"));