How do I notify widgets in Flutter?

And as with more things in Flutter, you listen to a Notification using another Widget: NotificationListener. var widget = Scaffold( body: NotificationListener<ScrollNotification>( onNotification: (notification) { //do things with the notification here return true; }, child: Container( child: …, ), ), );

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What is WidgetsApp?

A convenience widget that wraps a number of widgets that are commonly required for an application . One of the primary roles that WidgetsApp provides is binding the system back button to popping the Navigator or quitting the application.

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What is addListener in flutter?

addListener method Null safety Adds a listener callback that is called whenever a new concrete ImageInfo object is available or an error is reported . If a concrete image is already available, or if an error has been already reported, this object will notify the listener synchronously.

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