google-maps - 如何在 flutter 的谷歌地图自定义标记中添加额外的文本？

Question

问题是如何在自定义谷歌地图标记上使用代表车辆登记号的文本注入(inject)重叠文本。

我曾尝试使用此方法在图标上叠加文字 build 者:(上下文)=>() 但根本不认识。

  class MapsDemo extends StatefulWidget {
    @override
    State createState() => MapsDemoState();
  }

class MapsDemoState extends State<MapsDemo> {

  GoogleMapController mapController;
 //Map<PermissionGroup, PermissionStatus> permissions = await PermissionHandler().requestPermissions([PermissionGroup.contacts]);import 'package:permission_handler/permission_handler.dart';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
          body: Column(
            children: <Widget>[
            Container(
                height: MediaQuery.of(context).size.height,
                width: MediaQuery.of(context).size.width,
                child: GoogleMap(
                 onMapCreated: (GoogleMapController controller) {
                   mapController = controller;
                 },
                ),
            ),
           ],
         ),
         floatingActionButton: FloatingActionButton(onPressed: () {
        
          double mq1 = MediaQuery.of(context).devicePixelRatio;
          String icon = "images/car.png";
          if (mq1>1.5 && mq1<2.5) {icon = "images/car2.png";}
          else if(mq1 >= 2.5){icon = "images/car3.png";}
          print("Mq 1"+mq1.toStringAsFixed(5));
          String iconPath="lib/assets/move@3x.png";
          
          
         mapController.addMarker(
              MarkerOptions(
                position: LatLng(37.4219999, -122.0862462),
                infoWindowText: InfoWindowText("TEST","TEST"),
                icon: BitmapDescriptor.fromAsset(iconPath),
                consumeTapEvents: true,
                
                /*builder: (context) =>(

                )*/

                //icon:BitmapDescriptor.fromAsset(assetName)
              ),
         );
         
         mapController.addMarker(
              MarkerOptions(
                position: LatLng(38.4219999, -122.0862462),
                infoWindowText: InfoWindowText("tt","adfaf"),
                icon: BitmapDescriptor.fromAsset("lib/assets/logo.png"),
                anchor: Offset(100,160),
              
                //icon:BitmapDescriptor.fromAsset(assetName)
              ),
         );
       
         mapController.animateCamera(
            CameraUpdate.newCameraPosition(
              CameraPosition(
                target: LatLng(37.4219999, -122.0862462),
               
                zoom: 15.0,
              ),
            ),
          );
       
        })
      );
    
  }
  
}

如果您注意到图标右侧的空白区域是我希望注册号出现的位置，我所显示的是正确显示的图标。

Answer 1

试试这个:

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

class MapsDemo extends StatefulWidget {
  @override
  State createState() => MapsDemoState();
}

class MapsDemoState extends State<MapsDemo> {
  final Set<Marker> _markers = {};

  void _onAddMarkerButtonPressed() {
    print('in _onAddMarkerButtonPressed()');
    setState(() {
      _markers.add(Marker(
        // This marker id can be anything that uniquely identifies each marker.
        markerId: MarkerId("111"),
        position: LatLng(30.666, 76.8127),
        infoWindow: InfoWindow(
          title: "bingo! This works",
        ),
        icon: BitmapDescriptor.defaultMarker,
      ));
    });
    print('setState() done');
  }

  GoogleMapController mapController;
  //Map<PermissionGroup, PermissionStatus> permissions = await PermissionHandler().requestPermissions([PermissionGroup.contacts]);import 'package:permission_handler/permission_handler.dart';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Column(
          children: <Widget>[
            Container(
              height: MediaQuery.of(context).size.height,
              width: MediaQuery.of(context).size.width,
              child: GoogleMap(
                markers: _markers,
                onMapCreated: (GoogleMapController controller) {
                  mapController = controller;
                },
                initialCameraPosition:
                    CameraPosition(target: LatLng(30.666, 76.8127), zoom: 15),
              ),
            ),
          ],
        ),
        floatingActionButton: FloatingActionButton(onPressed: () {
          print('in fab()');
          double mq1 = MediaQuery.of(context).devicePixelRatio;



          _onAddMarkerButtonPressed();

          mapController.animateCamera(
            CameraUpdate.newCameraPosition(
              CameraPosition(
                target: LatLng(30.666, 76.8127),
                zoom: 15.0,
              ),
            ),
          );
        }));
  }
}