The argument type 'Future Function(TapPosition)' can't be assigned to the parameter type 'void Function(TapPosition, LatLng)?'

Question

FlutterMap(
            options: MapOptions(
            onTap: (p, point) async {
              GeoData location = await Geocoder2.getDataFromCoordinates(
                  latitude: p.latitude, longitude: p.longitude, googleMapApiKey: '');
              );
            print("${location.country}");
              setState((){
                point=p;
              });
            },
            center: LatLng(49.5, -0.09),
            zoom: 10.0
          ),

I am trying to use geocoder2 in my flutter app to work with maps. But I am facing this error. If someone could help, that'd be great.

  LatLng point=LatLng(49, -1);

This is my declaration of variables. And now the errors are:

The getter 'latitude' isn't defined for the type 'TapPosition'.

The getter 'longitude' isn't defined for the type 'TapPosition'.

A value of type 'TapPosition' can't be assigned to a variable of type 'LatLng'.

                  point: point, builder: (ctx)=> Icon(

This is the error where I am trying to use point.

import 'package:latlong/latlong.dart'; – Pratishtha S Jul 13 '22 at 20:16 — Pratishtha S, Jul 13 '22 at 20:16
Using `latlong2` will be handy because `FlutterMap` use it – Md. Yeasin Sheikh Jul 13 '22 at 20:21 — Md. Yeasin Sheikh, Jul 13 '22 at 20:21

Md. Yeasin Sheikh · Accepted Answer · 2022-07-13T20:14:48.070

3

onTap callback provide tapPosition and point.

typedef TapCallback = void Function(TapPosition tapPosition, LatLng point);

Include another parameters to solve this case like

 onTap: (tapPos, p) async {

More about MapOptions and flutter_map/TapCallback

Update

Full snippet be like

  LatLng point = LatLng(49, -1);
  GeoData? location;
   ...
FlutterMap(
      options: MapOptions(
          onTap: (f, p) async {
            p.latitude;
            location = await Geocoder2.getDataFromCoordinates(
                latitude: p.latitude,
                longitude: p.longitude,
                googleMapApiKey: '');
            setState(() {
              point = p;
            });
          },
          zoom: 10.0,
          center: LatLng(49, -1)),
    );

Note thing about use of packages

latlong2 and geocoder2

edited Jul 13 '22 at 20:14

answered Jul 13 '22 at 19:22

Md. Yeasin Sheikh

54,221
7
29
56

How do I provide TapCallback for this, declare it separately from onTap? – Pratishtha S Jul 13 '22 at 19:36
1

nope, you just need to replace `onTap: (p) ` with `onTap: (tapPos, p) ` you just need to include another parameter on callback, it can be any , – Md. Yeasin Sheikh Jul 13 '22 at 19:37
Even if that works, there are errors on geocoder2 – Pratishtha S Jul 13 '22 at 19:42
1

The second argument provides `LatLng`, – Md. Yeasin Sheikh Jul 13 '22 at 19:44
The getter 'latitude' isn't defined for the type 'TapPosition'. This is new error then, for longitude too. – Pratishtha S Jul 13 '22 at 19:50
It will be like `onTap: (tapPos, p) async { ... p.latitude;` – Md. Yeasin Sheikh Jul 13 '22 at 20:00
test updated snippet – Md. Yeasin Sheikh Jul 13 '22 at 20:15
should I declare it as Latlng2 ? – Pratishtha S Jul 13 '22 at 20:35
I still get the error for getter ..latitute and longitude one. Also, how can I pass GeoData to list? – Pratishtha S Jul 13 '22 at 20:39
The error occurs from mismatch of latlng pck, try using [latlong2](https://pub.dev/packages/latlong2) or you can do it manually like `point = LatLng(p.latitude, p.longitude)` – Md. Yeasin Sheikh Jul 14 '22 at 13:44

The argument type 'Future Function(TapPosition)' can't be assigned to the parameter type 'void Function(TapPosition, LatLng)?'

1 Answers1