private boolean applyBigPictureStyle(NotificationCompat.Builder builder) {
        List<Bitmap> attachmentsPictures = options.getAttachments();
        if (attachmentsPictures == null || attachmentsPictures.size() == 0) return false;

        builder.setStyle(new NotificationCompat.BigPictureStyle(builder)
            .setSummaryText(options.getSummary() != null ? options.getSummary() : options.getText())
            .bigPicture(attachmentsPictures.get(0))
        );

        return true; // style applied
    }
Apply big picture style. Only uses the first attachment.
@param builder Notification builder instance
@return true if the big picture style was applied
src/android/Notification.java