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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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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How do I make my own widget?

To get started, open the Widgetsmith app and go to Settings > Permissions. Here, grant permissions for features that you want to use (Reminders, Calendar, or Photos app). Now, go to the “My Widgets” tab and tap the “Add (Size) Widget” for the size of the widget you want to create.

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How do I make my own widget?

To get started, open the Widgetsmith app and go to Settings > Permissions. Here, grant permissions for features that you want to use (Reminders, Calendar, or Photos app). Now, go to the “My Widgets” tab and tap the “Add (Size) Widget” for the size of the widget you want to create.

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