| AttachmentItemClickListener | Interface for attachment click callbacks |
| Attachment | A class which shows Attachment. |
| AttachmentAction | An abstract class representing action to choose different types of attachments. |
| AttachmentFormCell | A custom control having a linear layout of TextView and RecyclerView.Recycler for selecting and demonstrating attachments. |
| AttachmentFormCell.AttachmentBroadcastReceiver |