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Exception thrown when using addMarkers #17

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Open
Exception thrown when using addMarkers#17

Description

@dimitri-berges
dimitri-berges
opened on Aug 6, 2020
══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (23709): The following NoSuchMethodError was thrown building StreamBuilder<int>(dirty, state:
I/flutter (23709): _StreamBuilderBaseState<int, AsyncSnapshot<int>>#4edd9):
I/flutter (23709): The method 'call' was called on null.
I/flutter (23709): Receiver: null
I/flutter (23709): Tried calling: call()
I/flutter (23709):
I/flutter (23709): The relevant error-causing widget was:
I/flutter (23709):   StreamBuilder<int>
I/flutter (23709):   file:///C:/Users/Dixmi/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_map-0.9.0/lib/src/layer/marker_layer.dart:110:12
I/flutter (23709):
I/flutter (23709): When the exception was thrown, this was the stack:
I/flutter (23709): #0      MarkerLayer.build.<anonymous closure> (package:flutter_map/src/layer/marker_layer.dart:134:39)
I/flutter (23709): #1      StreamBuilder.build (package:flutter/src/widgets/async.dart:509:81)
I/flutter (23709): #2      _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:127:48)
I/flutter (23709): #3      StatefulElement.build (package:flutter/src/widgets/framework.dart:4619:28)
I/flutter (23709): #4      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4502:15)
I/flutter (23709): #5      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4675:11)
I/flutter (23709): #6      Element.rebuild (package:flutter/src/widgets/framework.dart:4218:5)
I/flutter (23709): #7      StatefulElement.update (package:flutter/src/widgets/framework.dart:4707:5)
I/flutter (23709): #8      Element.updateChild (package:flutter/src/widgets/framework.dart:3201:15)
I/flutter (23709): #9      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4527:16)
I/flutter (23709): #10     Element.rebuild (package:flutter/src/widgets/framework.dart:4218:5)
I/flutter (23709): #11     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2627:33)
I/flutter (23709): #12     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:883:20)
I/flutter (23709): #13     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:284:5)
I/flutter (23709): #14     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1113:15)
I/flutter (23709): #15     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1052:9)
I/flutter (23709): #16     SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:861:7)
I/flutter (23709): (elided 4 frames from class _RawReceivePortImpl, class _Timer, and dart:async-patch)
I/flutter (23709):
I/flutter (23709): ════════════════════════════════════════════════════════════════════════════════════════════════════
flutter doctor -v
[√] Flutter (Channel stable, v1.17.5, on Microsoft Windows [version 10.0.18363.959], locale  
    fr-FR)
    • Flutter version 1.17.5 at D:\Lib\flutter
    • Framework revision 8af6b2f038 (5 weeks ago), 2020-06-30 12:53:55 -0700
    • Engine revision ee76268252
    • Dart version 2.8.4

 
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at C:\Users\Dixmi\AppData\Local\Android\sdk
    • Platform android-29, build-tools 29.0.3
    • Java binary at: D:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[√] Android Studio (version 4.0)
    • Android Studio at D:\Program Files\Android\Android Studio
    • Flutter plugin version 48.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] Connected device (1 available)
    • Redmi Note 8T • 141e86a0 • android-arm64 • Android 9 (API 28)

• No issues found!

I have this exception every times I try to add multiples markers at once.

Here is a part of the code I use :

var usersObject = Users.fromJson(Map<String, dynamic>.from(jsonDecode(users)));
setState(() {
   mapController.addMarkers(markers: usersObject.toMarkers());
});

And this is the Users class :

class Users {
  Users(this.names, this.locations);
  factory Users.fromJson(Map<String, dynamic> json) {
    var names = json.keys.toList();
    var locations = <Location>[];
    json.forEach((key, value) {
      locations.add(Location(
          latitude: value['latitude'],
          longitude: value['longitude'],
          accuracy: value['accuracy']));
    });
    return Users(names, locations);
  }

  List<String> names;
  List<Location> locations;

  Map<String, dynamic> toJson() {
    var map = <String, dynamic>{};
    names.forEach((element) {
      var index = names.indexOf(element);
      map.addAll({
        element: {
          'latitude': locations[index].latitude,
          'longitude': locations[index].longitude,
          'accuracy': locations[index].accuracy,
        }
      });
    });
    return map;
  }

  Map<String, Marker> toMarkers() {
    var map = <String, Marker>{};
    names.forEach((element) {
      var index = names.indexOf(element);
      map.addAll({
        element: Marker(
            point:
                LatLng(locations[index].latitude, locations[index].longitude))
      });
    });
    return map;
  }
}

JSON Pattern :

{
  "Test 2":
    {
      "latitude": <value>,
      "longitude": <value>,
      "accuracy": <value>
    },
  "Test":
    {
      "latitude": <value>,
      "longitude": <value>,
      "accuracy": <value>
    },
  "Test 3":
    {
      "latitude": <value>,
      "longitude": <value>,
      "accuracy": <value>
    }
}

I'm using Location from background_location but values are the same.
For LatLng I'm using latlong.dart

Is anyone can help me on this plz ?

Activity

  1. dimitri-berges commented on Aug 6, 2020

    @dimitri-berges
    dimitri-berges
    on Aug 6, 2020
    Author
    var usersObject = Users.fromJson(Map<String, dynamic>.from(jsonDecode(users)));
setState(() {
   mapController.addMarkers(markers: usersObject.toMarkers());
});

    In this case mapController is an instance of StatefulMapController

  2. dimitri-berges commented on Aug 6, 2020

    @dimitri-berges
    dimitri-berges
    on Aug 6, 2020
    Author
    setState(() {
        usersObject.toMarkers().forEach((name, marker) {
          mapController.addMarker(marker: marker, name: name);
        });
      });

    Also just tried to use addMarker instead but same error :

    ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (23709): The following NoSuchMethodError was thrown building StreamBuilder<int>(dirty, state:
I/flutter (23709): _StreamBuilderBaseState<int, AsyncSnapshot<int>>#4edd9):
I/flutter (23709): The method 'call' was called on null.
I/flutter (23709): Receiver: null
I/flutter (23709): Tried calling: call()
I/flutter (23709):
I/flutter (23709): The relevant error-causing widget was:
I/flutter (23709):   StreamBuilder<int>
I/flutter (23709):   file:///C:/Users/Dixmi/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_map-0.9.0/lib/src/layer/marker_layer.dart:110:12
I/flutter (23709):
I/flutter (23709): When the exception was thrown, this was the stack:
I/flutter (23709): #0      MarkerLayer.build.<anonymous closure> (package:flutter_map/src/layer/marker_layer.dart:134:39)
I/flutter (23709): #1      StreamBuilder.build (package:flutter/src/widgets/async.dart:509:81)
I/flutter (23709): #2      _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:127:48)
I/flutter (23709): #3      StatefulElement.build (package:flutter/src/widgets/framework.dart:4619:28)
I/flutter (23709): #4      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4502:15)
I/flutter (23709): #5      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4675:11)
I/flutter (23709): #6      Element.rebuild (package:flutter/src/widgets/framework.dart:4218:5)
I/flutter (23709): #7      StatefulElement.update (package:flutter/src/widgets/framework.dart:4707:5)
I/flutter (23709): #8      Element.updateChild (package:flutter/src/widgets/framework.dart:3201:15)
I/flutter (23709): #9      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4527:16)
I/flutter (23709): #10     Element.rebuild (package:flutter/src/widgets/framework.dart:4218:5)
I/flutter (23709): #11     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2627:33)
I/flutter (23709): #12     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:883:20)
I/flutter (23709): #13     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:284:5)
I/flutter (23709): #14     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1113:15)
I/flutter (23709): #15     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1052:9)
I/flutter (23709): #16     SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:861:7)
I/flutter (23709): (elided 4 frames from class _RawReceivePortImpl, class _Timer, and dart:async-patch)
I/flutter (23709):
I/flutter (23709): ════════════════════════════════════════════════════════════════════════════════════════════════════
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