[英]GeoLocation package doesn't work in flutter while running on a real device
import 'dart:async';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:geolocator/geolocator.dart';
//import 'package:provider/provider.dart';
class Map extends StatefulWidget {
@override
State<StatefulWidget> createState() => _MapState();
}
class _MapState extends State<Map> {
Completer<GoogleMapController> _controllerGoogleMap = Completer();
GoogleMapController newGoogleMapController;
Position currentPosition;
var geoLocator = Geolocator();
void locatePosition() async {
Position position = await Geolocator.getCurrentPosition(
desiredAccuracy: LocationAccuracy.best);
currentPosition = position;
LatLng latLngPos = LatLng(position.latitude, position.longitude);
CameraPosition cameraPosition =
CameraPosition(target: latLngPos, zoom: 15.0);
newGoogleMapController
.animateCamera(CameraUpdate.newCameraPosition(cameraPosition));
}
static final CameraPosition _kGooglePlex = CameraPosition(
target: LatLng(37.42796133580664, -122.085749655962),
zoom: 14.4746,
);
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: GoogleMap(
mapType: MapType.normal,
myLocationButtonEnabled: true,
initialCameraPosition: _kGooglePlex,
myLocationEnabled: true,
zoomGesturesEnabled: true,
zoomControlsEnabled: true,
onMapCreated: (GoogleMapController controller) {
_controllerGoogleMap.complete(controller);
newGoogleMapController = controller;
locatePosition();
},
),
),
);
}
}
調試終端下
Launching lib\main.dart on vivo 1906 in debug mode...
lib\main.dart:1 √ Built build\app\outputs\flutter-apk\app-debug.apk. I/flutter ( 9154):
Observatory listening on ************************************ I/flutter ( 9613):
Observatory listening on ************************************ E/flutter ( 9613): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception:
User denied permissions to access the device's location. E/flutter ( 9613):
#0 MethodChannelGeolocator._handlePlatformException package:geolocator_platform_interface/…/implementations/method_channel_geolocator.dart:199
E/flutter ( 9613): #1 MethodChannelGeolocator.getCurrentPosition package:geolocator_platform_interface/…/implementations/method_channel_geolocator.dart:
118 E/flutter ( 9613): <asynchronous suspension> E/flutter ( 9613): #2 _MapState.locatePosition package:donation_yoga/screens/maps.dart:
21 E/flutter ( 9613): <asynchronous suspension> E/flutter ( 9613):
我從來沒有拒絕我的許可,map 不顯示我的位置按鈕,即使我已經啟用它來獲取當前位置,只顯示放大和縮小按鈕和 map 就是這樣。
使用 Flutter 2.2.1 google_maps_flutter:^2.0.6 地理定位器:^7.0.3
PS:我已經嘗試過 location package 但它會引發很多錯誤,例如 location_web not found 等,
嘗試將 forceLocationManager 子句添加到您的 function:
void locatePosition() async {
Position position = await Geolocator.getLastKnownPosition({ bool forceAndroidLocationManager = true}
);
currentPosition = position;
LatLng latLngPos = LatLng(position.latitude, position.longitude);
CameraPosition cameraPosition =
CameraPosition(target: latLngPos, zoom: 15.0);
newGoogleMapController
.animateCamera(CameraUpdate.newCameraPosition(cameraPosition));
}
還要檢查您的 android 清單的位置:
<manifest ... >
<!-- To request foreground location access, declare one of these
permissions. -->
<uses-permission
android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
/>
</manifest>
還要保持您想要的低准確度,准確度充其量會在設備上造成隱私混亂,因此需要額外的步驟
pubspec.yaml
在依賴項下添加geolocator: ^8.0.1
:
dependencies:
flutter:
sdk: flutter
cupertino_icons: ^1.0.2
geolocator: ^8.0.1
AndroidManifest.xml
您將看到以下內容:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.get_weather">
在上述代碼下添加以下內容:
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.hardware.location.gps" />
main.dart
import 'package:flutter/material.dart';
import 'package:get_weather/screens/loading_screen.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData.dark(),
home: LoadingScreen(),
);
}
}
loading_screen.dart
import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
class LoadingScreen extends StatefulWidget {
@override
_LoadingScreenState createState() => _LoadingScreenState();
}
class _LoadingScreenState extends State<LoadingScreen> {
void getLocation() async {
bool serviceEnabled;
LocationPermission permission;
// Test if location services are enabled.
serviceEnabled = await Geolocator.isLocationServiceEnabled();
if (!serviceEnabled) {
// Location services are not enabled don't continue
// accessing the position and request users of the
// App to enable the location services.
return Future.error('Location services are disabled.');
}
permission = await Geolocator.checkPermission();
if (permission == LocationPermission.denied) {
permission = await Geolocator.requestPermission();
if (permission == LocationPermission.denied) {
// Permissions are denied, next time you could try
// requesting permissions again (this is also where
// Android's shouldShowRequestPermissionRationale
// returned true. According to Android guidelines
// your App should show an explanatory UI now.
return Future.error('Location permissions are denied');
}
}
if (permission == LocationPermission.deniedForever) {
// Permissions are denied forever, handle appropriately.
return Future.error(
'Location permissions are permanently denied, we cannot request permissions.');
}
Position position = await Geolocator.getCurrentPosition(
desiredAccuracy: LocationAccuracy.high);
print(position);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: ElevatedButton(
onPressed: () {
//Get the current location
getLocation();
},
child: Text('Get Location'),
),
),
);
}
}
loading_screen.dart
中的代碼將幫助您解決“用戶拒絕權限”問題。
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