Exit(0) is not preferred for closing a Flutter app because it abruptly terminates the app without allowing it to clean up resources or execute any necessary shutdown logic[1]. When an app is closed this way, the Flutter framework cannot execute the dispose() method on widgets, which is used to release resources like timers, subscriptions, or database connections[1].
Instead of exit(0), it's recommended to use the SystemNavigator.pop() method from the flutter/services.dart library to close the app[1]. This allows the app to properly terminate and execute any necessary cleanup code before exiting[1].
For example, you can use SystemNavigator.pop() in a button press handler to close the app:
