How to use WebView flutter to restrict Navigation to some pages - flutter

Question

I',m trying to use webview in my flutter app to take me back to the app once they navigate to a restricted url
I already created the controller and set it in my init state
super.initState();
controller = WebViewController()
..setJavaScriptMode(JavaScriptMode.unrestricted)
..setBackgroundColor(const Color(0x00000000))
..setNavigationDelegate(
NavigationDelegate(
onProgress: (int progress) {
SmartDialog.showLoading();
},
onPageStarted: (String url) {},
onPageFinished: (String url) {
SmartDialog.dismiss();
},
onWebResourceError: (WebResourceError error) {
SmartDialog.showToast('Something went wrong');
Navigator.pushNamedAndRemoveUntil(
context, '/landingpage', (Route<dynamic> route) => false);
},
onNavigationRequest: (NavigationRequest request) {
if (request.url.startsWith('https://www.youtube.com/')) {
return NavigationDecision.prevent;
} else if (request.url.endsWith('page5')) {
Navigator.pushNamedAndRemoveUntil(
context, '/landingpage', (Route<dynamic> route) => false);
} else if (request.url.startsWith(
'https://www.facebook.com/')) {
Navigator.pushAndRemoveUntil(
context,
MaterialPageRoute(
builder: (context) =>
verifyquickbuy(price: int.parse(widget.price))),
(Route<dynamic> route) => false);
}
return NavigationDecision.navigate;
},
),
)
..loadRequest(Uri.parse('https://google.com'));
}
I tried putting a print in the onNavigationRequest to know if it print all url I visit but it only works just when the webview is activated
getcontroller();
return SafeArea(
child: WebViewWidget(
controller: controller,
//gestureRecognizers: GestureDetector,
));
}
}