flutter
youtube
Tired of users accidentally closing your Flutter app? In this step-by-step tutorial you’ll learn how to intercept the system back button (or Android physical back) and show a friendly **exit confirmation dialog** using `WillPopScope` and `showDialog`. This is a practical, beginner-friendly guide that explains the why and how — with clear code examples you can copy and adapt for your own apps.
What we cover in this video:
✅ What `WillPopScope` does and why it’s the right place to handle back navigation
✅ How the `onWillPop` callback works and why it returns a `Futurebool`
✅ Building a custom `AlertDialog` (title, message, action buttons) to confirm exit
✅ Different ways to close the app: `Navigator.pop()`, `SystemNavigator.pop()` and `exit(0)` — and when to use each (platform considerations)
✅ Making the dialog async-safe so the back button waits for user response
✅ Customizing the dialog UI: icons, colors, descriptive text, and adaptive dialog for iOS vs Android
✅ Handling edge-cases: double-tap-to-exit, preventing exit during unsaved work, and saving app state before quitting
✅ Tips for accessibility, localization, and consistent UX across Android and iOS
We’ll walk through a minimal working example: wrap your `Scaffold` with `WillPopScope`, implement `onWillPop` to call a `showExitDialog()` function, and return `true` or `false` based on the user’s choice. You’ll also see an enhanced pattern: a reusable `ConfirmExit` widget and an optional “Press back again to exit” toast
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2025/11/14
youtube
