Flutter webview app closes when back button pressed - flutter

Question

I have a simple webview application, when i go some pages and press back button it closes the app. I want to go previous page when back button pressed. But my code give error on
Try correcting the name to the name of an existing method, or defining a method named '_onWillPop'.
onWillPop: () => _onWillPop(context),
return Scaffold(
body: SafeArea(
child: Stack(
children: <Widget>[
WillPopScope(
onWillPop: () => onWillPop(context),
child: WebView(
javascriptMode: JavascriptMode.unrestricted,
initialUrl: 'https://google.com',
navigationDelegate: (NavigationRequest request) {
setState(() {
isLoading = true;
});
return NavigationDecision.navigate;
},
onPageFinished: (String url) {
setState(() {
isLoading = false;
});
},
// onPageFinished: (finish) {
// setState(() {
// var isLoading = false;
// });
// },
),
),
isLoading
? const Center(
child: CircularProgressIndicator(),
)
: Stack(),
],
),
),
);

Answer 1

you Need to create method for onWillPopScope
this is example
Future<bool> initBackButton() async {
Logger().d('back button pressed');
return await showDialog(
context: context,
builder: (context) => ElasticIn(
child: AlertDialog(
title: const Text('Exit App'),
content: const Text('Do you really want to exit ?'),
actions: [
ElevatedButton(
onPressed: () => Navigator.of(context).pop(),
child: const Text('No'),
),
ElevatedButton(
onPressed: () => Navigator.of(context).pop(true),
child: const Text('Yes'),
),
],
),
),
) ??
false;
}
after that call like this
onWillPop: () => initBackButton,