after payment is successful i want to navigate to another page - flutter

Question

i'm working on a app. after payment is successful i want to navigate to another page.
Here is the code of my app payment method in the
void handlerPaymentSuccess() { Navigator.push(context, MaterialPageRoute(builder: (context) => Itemsbuy()));
i coded this to navigate that page but after payment is success this is not showing,
but after payment done its showing only payment successful from the razorpay but its not showing my page which i navigated. after payment success it is redirecting to the second route not redirecting to the Itemsbuy();
class SecondRoute extends StatefulWidget {
#override
_SecondRouteState createState() => _SecondRouteState();}
class _SecondRouteState extends State<SecondRoute> {
Razorpay razorpay;
TextEditingController textEditingController = new TextEditingController();
#override
void initState() {
razorpay = new Razorpay();
razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, handlerPaymentSuccess);
razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, handlerPaymentError);
razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, handlerExternalWallet);
super.initState(); }
void handlerPaymentSuccess() {
Navigator.push(context, MaterialPageRoute(builder: (context) => Itemsbuy()));//Items purchased}
this is the navigation that i want to push
void handlerPaymentError()
{
print('error'); }
void handlerExternalWallet()
#override
void dispose()
{
super.dispose();
razorpay.clear(); }
var options = {
"key": "empty",
"amount": empty,
"name": 'empty',
"Description": 'empty',
};
try {
razorpay.open(options);
} catch (e) {
debugPrint('error');
}}
thank you

Answer 1

Use the GetX package for navigation instead of Navigator.of(context)
Example:
void handlerPaymentSuccess() {
Get.to(Itemsbuy());
}
Also make sure to use GetMaterialApp instead of MaterialApp like this:
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return GetMaterialApp(
home: SplashScreen(),
color: violet,
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.deepPurple,
).copyWith(textTheme: GoogleFonts.montserratTextTheme()),
);
}
}
It should work.

Answer 2

class _Payment extends State {
bool paymentDone = false;
#override
Widget build(BuildContext context) {
if (paymentDone == true) {
return NewPage();
}
else{
return CurrentPage();
}
}
void _handlePaymentSuccess(PaymentSuccessResponse response) async {
Fluttertoast.showToast(msg: "SUCCESS: " + response.paymentId, timeInSecForIosWeb: 4);
setState(() {
paymentDone = true;
);}
}
}