Mostra la mia posizione

Questo esempio mostra come rappresentare la posizione dell'utente come un punto blu e visualizzare il pulsante La mia posizione nell'angolo in basso a destra della mappa. Quando l'utente tocca il pulsante, la mappa esegue la panoramica fino alla sua posizione attuale.

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 'dart:async';

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

/// User's location is shown as a blue dot and the My Location button
/// is displayed in the bottom right corner of the map. When the user taps
/// the button, the map pans to the user's current location.
class MyLocationSample extends StatefulWidget {
  const MyLocationSample({super.key});

  @override
  State<MyLocationSample> createState() => _MyLocationSampleState();
}

class _MyLocationSampleState extends State<MyLocationSample> {
  /// To use My Location on some platforms (such as Android),
  /// you need to ask the user for permission at runtime. See below.
  bool? _permissionGranted;

  @override
  Widget build(BuildContext context) {
    return GoogleMap(
      initialCameraPosition: CameraPosition(target: LatLng(37.78, -122.42)),

      // Enables the My Location layer.
      //
      // This feature is not available on all platforms and you MUST have
      // the appropriate location permission enabled in order for this to work.
      // See documentation of [GoogleMap.myLocationEnabled] for details.
      myLocationEnabled: _permissionGranted ?? false,

      // You can choose whether to show the button that lets the user
      // transport the camera to their current location.
      // This has no effect when `myLocationEnabled` is false.
      myLocationButtonEnabled: true,
    );
  }

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

  /// A *fake* implementation of requesting the permission.
  ///
  /// Real apps will use 3rd party packages such as `package:permission_handler`
  /// or build their own bespoke solution.
  Future<void> _requestPermission() async {
    // Wait a bit before continuing. This is required here because we call this
    // function from initState(), and that's too soon to be showing dialogues.
    await Future<void>.delayed(const Duration(seconds: 1));
    if (!mounted) return;

    var result = await showDialog<bool>(
      context: context,
      builder: (context) => SimpleDialog(
        title: Text('Requesting permission'),
        children: [
          SimpleDialogOption(
            onPressed: () => Navigator.pop(context, true),
            child: Text('Grant'),
          ),
          SimpleDialogOption(
            onPressed: () => Navigator.pop(context, false),
            child: Text('Deny'),
          ),
        ],
      ),
    );

    if (!mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(
          'Fake permission granted: $result. '
          'Remember that for My Location to actually work, '
          'you need an actual runtime permission on some platforms. '
          'See the code of this sample for more info.',
        ),
        duration: const Duration(seconds: 10),
        showCloseIcon: true,
      ),
    );

    setState(() {
      _permissionGranted = result;
    });
  }
}
my_location.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