PubSubMessageListener

PubSubMessageListener listener = new PubSubMessageListener() {
    public void onMessageReceived(PubSubMessage message) {
        Log.d("PubSub", "onMessageReceived: " + message.getMessage());
    }

    public void onOldMessagesReceived(List<PubSubMessage> messages) {
        Log.d("PubSub", "onOldMessagesReceived: " + messages);
    }

    public void onOldMessagesReceived(List<PubSubMessage> messages, PubSubHistoryInfo info) {
        Log.d("PubSub", "onOldMessagesReceived: " + messages.size() + " messages, isLast: " + info.isLast());
    }

    public void onBatchReceived(List<PubSubMessage> messages) {
        Log.d("PubSub", "onBatchReceived: " + messages.size() + " messages");
    }

    public void onMessageDrop(PubSubMessageDropInfo info) {
        Log.d("PubSub", "onMessageDrop: dropped " + info.getDroppedCount() + " messages");
    }
};

try {
    meeting.pubSub.subscribe("CHAT", listener);
} catch (Exception e) {
    Log.d("VideoSDK", "subscribe failed: " + e.getMessage());
}