Indicatori cluster

Questo esempio definisce un gruppo di indicatori vicini come cluster in modo che la mappa possa riunirli in un unico indicatore, se opportuno.

Inizia

Prima di poter provare il codice di esempio, devi configurare il tuo ambiente di sviluppo. Per saperne di più, consulta Configurare un progetto Flutter.

Visualizza il codice

Dart

// Copyright 2025 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

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

/// Defines a group of nearby markers as a cluster so that the map can
/// collapse them into a single marker when appropriate.
class ClustersSample extends StatelessWidget {
  ClustersSample({super.key});

  final ClusterManager _myCluster = ClusterManager(
    clusterManagerId: ClusterManagerId('my cluster'),
  );

  @override
  Widget build(BuildContext context) {
    return GoogleMap(
      initialCameraPosition: CameraPosition(target: LatLng(0, 0)),

      // You have to supply the list of clusters that are referred to
      // by the map's markers.
      //
      // Note: For clusters to work on the web, you *must* import an additional
      // JavaScript library. Read the web README for info:
      // https://pub.dev/packages/google_maps_flutter_web
      clusterManagers: {_myCluster},
      markers: {
        // Google Maps will smartly cluster markers with the same
        // clusterManagerId. When zoomed in close enough, the cluster will
        // break up into individual markers.
        Marker(
          markerId: MarkerId('in 1'),
          position: LatLng(6.51, 3.37),
          clusterManagerId: _myCluster.clusterManagerId,
        ),
        Marker(
          markerId: MarkerId('in 2'),
          position: LatLng(6.64, 3.52),
          clusterManagerId: _myCluster.clusterManagerId,
        ),
        Marker(
          markerId: MarkerId('in 3'),
          position: LatLng(6.46, 3.58),
          clusterManagerId: _myCluster.clusterManagerId,
        ),
        Marker(
          markerId: MarkerId('in 4'),
          position: LatLng(6.85, 3.63),
          clusterManagerId: _myCluster.clusterManagerId,
        ),

        // Markers without a clusterManagerId will always show independently.
        Marker(markerId: MarkerId('out'), position: LatLng(5.31, -3.99)),
      },
    );
  }
}
marker_clusters.dart
    

Passaggi successivi

Visualizza l'insieme completo di esempi su GitHub:

Visualizza su GitHub

In alternativa, clona l'intero set di esempi per eseguirli localmente eseguendo i seguenti comandi:

  git clone -b flutter_samples https://github.com/googlemaps-samples/flutter-maps-samples.git
  cd flutter-samples
  flutter pub get