ListingDisplay.java

        ArrayList<Listing> shows = new ArrayList<Listing>();
        String channelId = listings.get(0).getChannelId();

        for( Listing listing : listings ) {
            if(!channelId.equals(listing.getChannelId())) {
                mBlock.add(shows);
                shows = new ArrayList<Listing>();
            }
            shows.add(listing);
        }