Accessing route parameters in Dart and flutter-CodePudding

I am sending 2 parameters restaurantDetails.rest_latitude and restaurantDetails.rest_longitude to a class to get the map details

BarMapWidget(restaurantDetails.rest_latitude, restaurantDetails.rest_longitude),

In the class I have a stateful widget

class BarMapWidget extends StatefulWidget {

  String restLatitude;
  String restLongitude;

  BarMapWidget(this.restLatitude, this.restLongitude, {Key? key}) : super(key: key);

  @override

  _BarMapWidgetState createState() => _BarMapWidgetState();

}

I am passing a string so I know I have to make it a double

Here is the extended class,

class _BarMapWidgetState extends State<BarMapWidget> {


// Destination Longitude
final double _destLatitude = restLatitude;
final double _destLongitude = restLongitude;

void initState() {
    // Add destination marker

    _addMarker(
      LatLng(_destLatitude, _destLongitude),
      "destination",
      // BitmapDescriptor.defaultMarkerWithHue(90),
      BitmapDescriptor.defaultMarker
    );
    super.initState();
  }

Which give me a Undefined name 'restLatitude'. and Undefined name 'restLongitude'.

How can I access the variable in BarMapWidget?

CodePudding user response：

Your restLatitude and restLongitude on widget level, try using widget.variableName. Also, those aren't matching datatype.

If you need double convert BarMapWidget variable to double.

To initialize on state level you can trick with using late or use initState;

class BarMapWidget extends StatefulWidget {
  final double restLatitude;
  final double restLongitude;

  const BarMapWidget(this.restLatitude, this.restLongitude, {Key? key})
      : super(key: key);

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

class _BarMapWidgetState extends State<BarMapWidget> {
// Destination Longitude
  late final double _destLatitude = widget.restLatitude;
  late final double _destLongitude = widget.restLongitude;

CodePudding user response：

Just add in

widget.restLatitude