CODEWITHSUNDEEP
flutterdart
Fagner Schuindt Caetano
Fagner Schuindt Caetano

Reputation: 181

error: The argument type 'MaterialPageRoute' can't be assigned to the parameter type 'Route<Map>'

I am learning flutter and this code is straight from the teacher. I know that flutter changing all the time and this may be why it is not running. anyways here it is:

class Klimatic extends StatefulWidget {
  @override
  _KlimaticState createState() => new _KlimaticState();
}

class _KlimaticState extends State<Klimatic> {

  String _cityEntered;

  Future _goToNextScreen(BuildContext context) async {
    Map results = await Navigator
        .of(context)
        .push(new MaterialPageRoute<dynamic>(builder: (BuildContext context) {
      return new ChangeCity();
    }));

    if ( results != null && results.containsKey('enter')) {
       _cityEntered = results['enter'];

//      debugPrint("From First screen" + results['enter'].toString());


    }
  }

Upvotes: 5

Views: 17411

Answers (2)

ישו אוהב אותך
ישו אוהב אותך

Reputation: 29783

This is because the current Flutter reject the parameter type of dynamic for MaterialPageRoute.

You need to change the following code:

Map results = await Navigator
    .of(context)
    .push(new MaterialPageRoute<dynamic>(builder: (BuildContext context) {
  return new ChangeCity();
}));

to 

Map results = await Navigator.of(context)
   .push(MaterialPageRoute(builder: (BuildContext context) {
        return ChangeCity();
      })
   );

As you can see from the above changes, you don't need the dynamic keyword. And there is no need for new keyword anymore because it's optional now.

Upvotes: 3

matanlurey
matanlurey

Reputation: 8614

Without knowledge of the exact API details, it looks like you are expecting a type of Route<Map>, but you're creating a Route<dynamic> (or MaterialPageRoute<dynamic>). I'm assuming you could try:

new MaterialPageRoute<Map>(...)

... instead.

Upvotes: 5

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