Created
April 28, 2023 14:25
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Tap again to exit
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| class DoubleBack extends StatefulWidget { | |
| const DoubleBack({super.key, required this.child}); | |
| final Widget child; | |
| @override | |
| State<DoubleBack> createState() => _DoubleBackState(); | |
| } | |
| class _DoubleBackState extends State<DoubleBack> { | |
| DateTime? pressedTime; | |
| Future<bool> tapAgainToExitToast([String? text]) async { | |
| final now = DateTime.now(); | |
| // If pressed to back button before and haven't passed 2 seconds yet, go back. | |
| // Otherwise do nothing | |
| if (pressedTime == null || | |
| now.difference(pressedTime!) > const Duration(seconds: 2)) { | |
| // updates the pressed time | |
| pressedTime = now; | |
| // I didn't want to include any package into this project | |
| // but you can add your toast message here :) | |
| log('Tap again to exit'); | |
| // do not pop the route | |
| return false; | |
| } | |
| // pop the route | |
| return true; | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return WillPopScope( | |
| // on back pressed | |
| onWillPop: tapAgainToExitToast, | |
| child: widget.child, | |
| ); | |
| } | |
| } | |
| // It is useful only for android devices | |
| class TapAgainToExit extends StatelessWidget { | |
| const TapAgainToExit({super.key}); | |
| @override | |
| Widget build(BuildContext context) { | |
| // Magic Happens here | |
| // A WillPopScope wrapper widget to make the feature reusable | |
| return DoubleBack( | |
| child: Scaffold( | |
| appBar: AppBar( | |
| title: const Text('Tap again to exit'), | |
| ), | |
| body: const Center( | |
| child: Text('Press on the back button 2 times to exit the app'), | |
| ), | |
| ), | |
| ); | |
| } | |
| } |
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