encode method
Implementation
Future<MessagePayload> encode() async {
MessagePayload payload = new MessagePayload();
payload.mentionedType = mentionedType;
payload.mentionedTargets = mentionedTargets;
payload.extra = extra;
if (meta != null) {
payload.contentType = meta!.type;
}
payload.mentionedType = 0;
payload.mediaType = MediaType.Media_Type_GENERAL;
return payload;
}