Flutter Exit App on Back press | WillPopScope Widget

Hello Everyone,
In this tutorial, We will see how to put time when the user pressed the back button. This functionality works on both Android & IOS.
How to use WillPopScope Widget in flutter.

Flutter Widgets Tutorial :-

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TIMELINE
00:05 WillPopScope Widget
00:29 How to exit app on back pressed in flutter
01:21 Snackbar Flutter