问题
How to send a message in offline using quickblox
回答1:
You can send common message and offline opponent will get push notification. If you mean sending message without login to the chat, you can send message via REST, use next snippet for Android:
QBChatMessage qbChatMessage = ...;
QBRestChatService.createMessage(qbChatMessage, true).perform();
来源：https://stackoverflow.com/questions/45972716/how-to-send-a-message-in-offline-using-quickblox-sdk-ios-like-whatsapp