How to pass map from one screen to another in flutter?

Question

I want to pass an object of the map from one flutter screen to another

Answer 1

Here is a sample.
Screen One

class ScreenOne extends StatefulWidget {
  ScreenOne({Key key}) : super(key: key);

  @override
  _ScreenOneState createState() => _ScreenOneState();
}

class _ScreenOneState extends State<ScreenOne> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Screen One"),
      ),
      body: Container(
        child: FlatButton(
          child: Text("Goto Screen Two"),
          onPressed: () {
            Map<String, dynamic> map = {
              "field": "value",
              "another_field": 1,
            };
            Navigator.of(context).push(MaterialPageRoute(builder: (context) => ScreenTwo(receivedMap: map,),));
          },
        ),
      ),
    );
  }
}

Screen Two

class ScreenTwo extends StatefulWidget {
  Map<String, dynamic> receivedMap;

  ScreenTwo({this.receivedMap});

  @override
  _ScreenTwoState createState() => _ScreenTwoState();
}

class _ScreenTwoState extends State<ScreenTwo> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Screen Two"),
      ),
      body: Container(
        child: Text("Screen one sent me this : ${widget.receivedMap["field"]} and ${widget.receivedMap["another_field"]}"),
      ),
    );
  }
}

Edit
You can also use StatelessWidget if you want