How can I create a simple chat function in a mobile app for iOS and Android

I am wondering how can I create a chat function in my mobile app creating in AIR and Flex. The chat should be similar to the one in WhatsApp.
Do you know some possible solutions?
Thank you in advance!

To enable chat messages, you need a server. The kind of server depends on the application. Do you want to create a chat like application like WhatsApp, where the server pushes messages without an active connection? Or do you have some sort of online game, where chat messages can only be transferred when the client is connected already?
I have an online game where clients are connected to a Java server at all time. From there it is pretty straight forward:
2 textfields:
- 1 line textfield for input messages
- multi-line textfield for chat history. Make sure the textfields autoscrolls to the bottom when the content changes
on enter or button push, send a socket message to the server.
the server broadcasts all messages to all clients that are subscribers of the chat group.

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How can I create a simple chat function in a mobile app for iOS and Android

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