flutter gps code example
Example 1: flutter geolocator web
@JS('navigator.geolocation')
library jslocation;
import "package:js/js.dart";
@JS('getCurrentPosition')
from Geolocation API
external void getCurrentPosition(Function success(GeolocationPosition pos));
@JS()
@anonymous
class GeolocationCoordinates {
external double get latitude;
external double get longitude;
external double get altitude;
external double get accuracy;
external double get altitudeAccuracy;
external double get heading;
external double get speed;
external factory GeolocationCoordinates(
{double latitude,
double longitude,
double altitude,
double accuracy,
double altitudeAccuracy,
double heading,
double speed});
}
@JS()
@anonymous
class GeolocationPosition {
external GeolocationCoordinates get coords;
external factory GeolocationPosition({GeolocationCoordinates
coords});
}
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import 'package:Shared/locationJs.dart';
success(pos) {
try {
print(pos.coords.latitude);
print(pos.coords.longitude);
} catch (ex) {
print("Exception thrown : " + ex.toString());
}
}
_getCurrentLocation() {
if (kIsWeb) {
getCurrentPosition(allowInterop((pos) => success(pos)));
}
}
Example 2: geolocation using flutter
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:geolocator/geolocator.dart';
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
final Geolocator geolocator = Geolocator()..forceAndroidLocationManager;
Position _currentPosition;
String _currentAddress;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Location"),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
if (_currentPosition != null) Text(_currentAddress),
FlatButton(
child: Text("Get location"),
onPressed: () {
_getCurrentLocation();
},
),
],
),
),
);
}
_getCurrentLocation() {
geolocator
.getCurrentPosition(desiredAccuracy: LocationAccuracy.best)
.then((Position position) {
setState(() {
_currentPosition = position;
});
_getAddressFromLatLng();
}).catchError((e) {
print(e);
});
}
_getAddressFromLatLng() async {
try {
List<Placemark> p = await geolocator.placemarkFromCoordinates(
_currentPosition.latitude, _currentPosition.longitude);
Placemark place = p[0];
setState(() {
_currentAddress =
"${place.locality}, ${place.postalCode}, ${place.country}";
});
} catch (e) {
print(e);
}
}
}