How to emit specific event with SocketIOClient on Android?

I connect with SocketIOClient on Android.

Connection codes:

SocketIOClient.connect(AsyncHttpClient.getDefaultInstance(),
                "http://192.168.2.61:8080/", mConnectCallback);

but I didn't find any solution for emit("eventName",data) with SocketIOClient.
I can do SocketIOClient.on("eventName",EventCallback..) so I emit("eventName",data) on my node.js server.But I can't do in android with SocketIOClient.

How can I emit a special event via SocketIOClient on android?