Flutter Tutorial - Handle Back Button Pressed | WillPopScope Widget

Use WillPopScope widget to handle back button pressed on Android and iOS in Flutter and detect if the user leaves the current screen.
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TIMELINE
0:00 Introduction Handle Back Button Pressed
0:49 Create WillPopScope Widget
1:04 Return Value False In WillPopScope To Stay On Same Screen
1:16 Return Value True In WillPopScope To Pop Screen OR Exit App
1:32 Show Dialog Via WillPopScope Widget
2:42 Fix Null Safe showDialog Returning Future Bool With WillPopScope
2:55 Showcase Exit App On Back Press
3:17 Show Dialog OnBackPressed And Back Button Event

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