What is the method to place a listener within initState() in Flutter?

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To place a listener within initState() in Flutter, you can use the addListener() method on any StreamSubscription. Here's an example:

StreamSubscription _subscription;

@override
void initState() {
  super.initState();
  _subscription = myStream.listen((data) {
    // handle incoming data here
  });
}

@override
void dispose() {
  _subscription.cancel();
  super.dispose();
}

In this example, we first create a StreamSubscription object called _subscription. Then, in our initState() method, we call the listen() method on our stream (in this case, myStream) and pass in a callback function that will be called every time new data is emitted by the stream. Finally, in our dispose() method, we call the cancel() method on the subscription to prevent any memory leaks.