main.dart

import 'dart:async';

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
  
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final CameraPosition _initialPosition = CameraPosition(
    target: LatLng(56.946285, 24.105078),
    zoom: 15,
  );

  final List<Marker> _markers = [];
  Completer<GoogleMapController> _mapController = Completer();

  MapType _currentMapType = MapType.normal;

  void _onMapCreated(GoogleMapController controller) {
    _loadAllMarkers();
    _mapController.complete(controller);
  }

  void _loadAllMarkers() {
    setState(() {
      _markers.add(Marker(
        markerId: MarkerId('marker1'),
        position: LatLng(56.94814589702577, 24.153787161095153),
        icon: BitmapDescriptor.defaultMarker,
        anchor: const Offset(1.0, 1.0),
      ));
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: GoogleMap(
        mapType: _currentMapType,
        initialCameraPosition: _initialPosition,
        onMapCreated: _onMapCreated,
        markers: _markers.toSet(),
        minMaxZoomPreference: MinMaxZoomPreference(10, 20),
      ),
    );
  }
}

pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
  google_maps_flutter: 2.0.3
  google_maps_flutter_web: 0.3.0
  google_maps_webservice: 0.0.20-nullsafety.3

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2

flutter doctor -v

[✓] Flutter (Channel stable, 2.0.4, on macOS 11.2.3 20D91 darwin-x64, locale en-GB)
    • Flutter version 2.0.4 at /Users/user1/Documents/flutter
    • Framework revision b1395592de (2 weeks ago), 2021-04-01 14:25:01 -0700
    • Engine revision 2dce47073a
    • Dart version 2.12.2

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/user1/Library/Android/sdk
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = /Users/user1/Library/Android/sdk
    • Java binary at: /Users/user1/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/201.7042882/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses

[!] Xcode - develop for iOS and macOS
    ✗ Xcode installation is incomplete; a full installation is necessary for iOS development.
      Download at: https://developer.apple.com/xcode/download/
      Or install Xcode via the App Store.
      Once installed, run:
        sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
        sudo xcodebuild -runFirstLaunch
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Users/user1/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/201.7042882/Android
      Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] Connected device (2 available)
    • sdk gphone x86 arm (mobile) • emulator-5554 • android-x86    • Android 11 (API 30) (emulator)
    • Chrome (web)                • chrome        • web-javascript • Google Chrome 89.0.4389.128

! Doctor found issues in 2 categories.

index.html

<!DOCTYPE html>
<html>
<head>
  <base href="/">
  <meta charset="UTF-8">
  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
  <meta name="description" content="A new Flutter project.">
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <meta name="apple-mobile-web-app-title" content="mapsample">
  <link rel="apple-touch-icon" href="icons/Icon-192.png">
  <link rel="icon" type="image/png" href="favicon.png"/>
  <title>mapsample</title>
  <link rel="manifest" href="manifest.json">
</head>
<body>

  <script>
    if ('serviceWorker' in navigator) {
      window.addEventListener('flutter-first-frame', function () {
        navigator.serviceWorker.register('flutter_service_worker.js');
      });
    }
  </script>
    <script src="main.dart.js" type="application/javascript"></script>
    <script src="https://maps.googleapis.com/maps/api/js?key=secret"></script>
</body>
</html>

[google_maps_flutter_web] Markers anchor and rotation have no effect #80578

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