Load older messages

String conversationID = "si_user_a_user_b";
Message startMessage = null; // Pass null for the initial page, or the oldest message from the last batch
int count = 20;

OpenIMClient.getInstance().messageManager.getAdvancedHistoryMessageList(
    new OnBase<AdvancedMessage>() {
        @Override
        public void onSuccess(AdvancedMessage result) {
            List<Message> messages = result.getMessageList();
            boolean reachedBeginning = result.isEnd();
            // Prepend deduplicated messages to the top of the chat timeline using clientMsgID
        }

        @Override
        public void onError(int code, String error) {
            // Failed to load historical messages
        }
    },
    conversationID,
    startMessage,
    count,
    ViewType.History
);