location 2.0.0 location: ^2.0.0 copied to clipboard
A Flutter plugin for location with Callbacks.
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:location/location.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<MyApp> {
LocationData _startLocation;
LocationData _currentLocation;
StreamSubscription<LocationData> _locationSubscription;
Location _location = new Location();
bool _permission = false;
String error;
bool currentWidget = true;
Image image1;
@override
void initState() {
super.initState();
initPlatformState();
_locationSubscription =
_location.onLocationChanged().listen((LocationData result) {
setState(() {
_currentLocation = result;
});
});
}
// Platform messages are asynchronous, so we initialize in an async method.
initPlatformState() async {
LocationData location;
// Platform messages may fail, so we use a try/catch PlatformException.
try {
_permission = await _location.hasPermission();
location = await _location.getLocation();
error = null;
} on PlatformException catch (e) {
if (e.code == 'PERMISSION_DENIED') {
error = 'Permission denied';
} else if (e.code == 'PERMISSION_DENIED_NEVER_ASK') {
error = 'Permission denied - please ask the user to enable it from the app settings';
}
location = null;
}
// If the widget was removed from the tree while the asynchronous platform
// message was in flight, we want to discard the reply rather than calling
// setState to update our non-existent appearance.
//if (!mounted) return;
setState(() {
_startLocation = location;
});
}
@override
Widget build(BuildContext context) {
List<Widget> widgets;
if (_currentLocation == null) {
widgets = new List();
} else {
widgets = [
new Image.network(
"https://maps.googleapis.com/maps/api/staticmap?center=${_currentLocation.latitude},${_currentLocation.longitude}&zoom=18&size=640x400&key=YOUR_API_KEY")
];
}
widgets.add(new Center(
child: new Text(_startLocation != null
? 'Start location: ${_startLocation.latitude} & ${_startLocation.longitude}\n'
: 'Error: $error\n')));
widgets.add(new Center(
child: new Text(_currentLocation != null
? 'Continuous location: ${_currentLocation.latitude} & ${_currentLocation.longitude}\n'
: 'Error: $error\n')));
widgets.add(new Center(
child: new Text(_permission
? 'Has permission : Yes'
: "Has permission : No")));
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: new Text('Location plugin example app'),
),
body: new Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: widgets,
)));
}
}