从FireBase检索扑扑的googlemaps标记

问题描述

对此我需要一些帮助，我正在尝试使我的火力基地中的所有标记都显示在地图上，但是只有一个想要显示！我最终也想在其上添加一个计时方面，但是我还没有弄清楚这一点：）

所以我主要对从Firebase检索感兴趣。但是我还想添加一个功能，说该功能在使用10分钟后会删除数据库中的条目。

我的代码

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';

class MapsPage extends StatefulWidget {
  @override
  _MapsPageState createState() => _MapsPageState();
}

class _MapsPageState extends State<MapsPage> {
  GoogleMapController controller;

  var currentLocation;

  Map<MarkerId,Marker> markers = <MarkerId,Marker>{};

  void initMarker(specify,specifyId) async {
    var markerIdVal = specifyId;
    final MarkerId markerId = MarkerId(markerIdVal);
    final Marker marker = Marker(
      markerId: markerId,position: LatLng(specify['loc'].latitude,specify['loc'].longitude),infoWindow: InfoWindow(title: 'Shop',snippet: specify['name']),);
    setState(() {
      markers[specifyId] = marker;
    });
  }

  getMarkerData() async {
    FirebaseFirestore.instance.collection('markers').get().then((myMockDoc) {
      if (myMockDoc.docs.isNotEmpty) {
        for (int i = 0; i < myMockDoc.docs.length; i++) {
          initMarker(myMockDoc.docs[i].data,myMockDoc.docs[i].id);
        }
      }
    });
  }

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    Set<Marker> getMarker() {
      return <Marker>[
        Marker(
            markerId: MarkerId('markers'),position: LatLng(43.6500194,-79.3916367),icon: BitmapDescriptor.defaultMarkerWithHue(
                BitmapDescriptor.hueMagenta),infoWindow: InfoWindow(title: 'Home'))
      ].toSet();
    }

    return Scaffold(
        appBar: AppBar(
          backgroundColor: Color.fromARGB(255,42,27,113),title: Text('Ride!'),),body: GoogleMap(
            markers: getMarker(),mapType: MapType.normal,initialCameraPosition: CameraPosition(
                target: LatLng(43.6500418,-79.3916043),zoom: 13.5),onMapCreated: (GoogleMapController controller) {
              controller = controller;
            }));
  }
}

我的终端机

Flutter run key commands.
r Hot reload. ???
R Hot restart.
h Repeat this help message.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).
An Observatory debugger and profiler on iPhone 11 Pro Max is available at: http://127.0.0.1:58253/XVsWUmPbmt8=/
Google Maps SDK for iOS version: 3.9.0.0
New version of Google Maps SDK for iOS available: 4.0.0.0
[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: RangeError (index): Invalid value: Not in inclusive range 0..3: 5
#0      List.[] (dart:core-patch/growable_array.dart:177:60)
#1      _MapsPageState.getMarkerData.<anonymous closure> (package:myttcmap/screen/home_screen/home_screen.dart:36:36)
#2      _rootRunUnary (dart:async/zone.dart:1198:47)
#3      _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#4      _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
#5      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45)
#6      Future._propagateToListeners (dart:async/future_impl.dart:725:32)
#7      Future._completeWithValue (dart:async/future_impl.dart:529:5)
#8      _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:40:15)
#9      _completeOnAsyncReturn (dart:async-patch/async_patch.dart:311:13)
#10     Query.get (package:cloud_firestore/src/query.dart)
<asynchronous suspension>
#11     _MapsPageState.getMarkerData (package:myttcm<…>
[VERBOSE-2:profiler_metrics_ios.mm(184)] Error retrieving thread information: (ipc/send) invalid destination port

Performing hot restart...                                               
Restarted application in 821ms.
[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: Closure call with mismatched arguments: function '[]'
Receiver: Closure: () => Map<String,dynamic> from Function 'data':.
Tried calling: []("loc")
Found: []() => Map<String,dynamic>
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      _MapsPageState.initMarker (package:myttcmap/screen/home_screen/home_screen.dart:24:31)
#2      _MapsPageState.getMarkerData.<anonymous closure> (package:myttcmap/screen/home_screen/home_screen.dart:36:11)
#3      _rootRunUnary (dart:async/zone.dart:1198:47)
#4      _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#5      _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
#6      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45)
#7      Future._propagateToListeners (dart:async/future_impl.dart:725:32)
#8      Future._completeWithValue (dart:async/future_impl.dart:529:5)
#9      _AsyncAwaitCompleter.complete (dart:async-p<…>
[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: Closure call with mismatched arguments: function '[]'
Receiver: Closure: () => Map<String,dynamic>
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      _MapsPageState.initMarker (package:myttcmap/screen/home_screen/home_screen.dart:24:31)
#2      _MapsPageState.getMarkerData.<anonymous closure> (package:myttcmap/screen/home_screen/home_screen.dart:36:11)
#3      _rootRunUnary (dart:async/zone.dart:1198:47)
#4      _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#5      _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
#6      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45)
#7      Future._propagateToListeners (dart:async/future_impl.dart:725:32)
#8      Future._completeWithValue (dart:async/future_impl.dart:529:5)
#9      _AsyncAwaitCompleter.complete (dart:async-p<…>
[VERBOSE-2:profiler_metrics_ios.mm(184)] Error retrieving thread information: (ipc/send) invalid destination port

Performing hot restart...                                               
Restarted application in 788ms.
[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: Closure call with mismatched arguments: function '[]'
Receiver: Closure: () => Map<String,dynamic>
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      _MapsPageState.initMarker (package:myttcmap/screen/home_screen/home_screen.dart:24:31)
#2      _MapsPageState.getMarkerData.<anonymous closure> (package:myttcmap/screen/home_screen/home_screen.dart:36:11)
#3      _rootRunUnary (dart:async/zone.dart:1198:47)
#4      _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#5      _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
#6      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45)
#7      Future._propagateToListeners (dart:async/future_impl.dart:725:32)
#8      Future._completeWithValue (dart:async/future_impl.dart:529:5)
#9      _AsyncAwaitCompleter.complete (dart:async-p<…>

解决方法

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