Flutter：异步消息，如whatsapp

Question

我的应用程序中有一个聊天系统，我希望该应用程序每次都在api上监听，以查看是否没有类似whatsapp的新消息。但是我不知道如何继续

Answer 1

What you are looking for is probably WebSockets . WebSockets provide duplex communication which are used to communicate between a server and a client. Ideally, you want to implement a publish-subscribe mechanism where you can Publish from your server and subscribe on the client, which is your chat app. There are many open source, PAAS, IAAS solutions which can be used to achieve what you want to achieve.

For open source, I would recommend you check out socket.io .

Keep in mind that when running socket.io , you have to deal with scaling and hosting the server version yourself. To avoid this, a lot of people usually go with PAAS or IAAS services.

For PAAS services, I have used and would recommend ably .