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Flutter Background Geolocation hello_world.dart https://shop.transistorsoft.com/blogs/news
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/** | |
* flutter_background_geolocation Hello World | |
* https://github.com/transistorsoft/flutter_background_geolocation | |
*/ | |
import 'package:flutter/material.dart'; | |
import 'package:flutter_background_geolocation/flutter_background_geolocation.dart' as bg; | |
//// | |
// For pretty-printing location JSON. Not a requirement of flutter_background_geolocation | |
// | |
import 'dart:convert'; | |
JsonEncoder encoder = new JsonEncoder.withIndent(" "); | |
// | |
//// | |
void main() => runApp(new MyApp()); | |
class MyApp extends StatelessWidget { | |
// This widget is the root of your application. | |
@override | |
Widget build(BuildContext context) { | |
return new MaterialApp( | |
title: 'BackgroundGeolocation Demo', | |
theme: new ThemeData( | |
primarySwatch: Colors.amber, | |
), | |
home: new MyHomePage(title: 'BackgroundGeolocation Demo'), | |
); | |
} | |
} | |
class MyHomePage extends StatefulWidget { | |
MyHomePage({Key key, this.title}) : super(key: key); | |
final String title; | |
@override | |
_MyHomePageState createState() => new _MyHomePageState(); | |
} | |
class _MyHomePageState extends State<MyHomePage> { | |
bool _isMoving; | |
bool _enabled; | |
String _motionActivity; | |
String _odometer; | |
String _content; | |
@override | |
void initState() { | |
_isMoving = false; | |
_enabled = false; | |
_content = ''; | |
_motionActivity = 'UNKNOWN'; | |
_odometer = '0'; | |
// 1. Listen to events (See docs for all 12 available events). | |
bg.BackgroundGeolocation.onLocation(_onLocation); | |
bg.BackgroundGeolocation.onMotionChange(_onMotionChange); | |
bg.BackgroundGeolocation.onActivityChange(_onActivityChange); | |
bg.BackgroundGeolocation.onProviderChange(_onProviderChange); | |
bg.BackgroundGeolocation.onConnectivityChange(_onConnectivityChange); | |
// 2. Configure the plugin | |
bg.BackgroundGeolocation.ready(bg.Config( | |
desiredAccuracy: bg.Config.DESIRED_ACCURACY_HIGH, | |
distanceFilter: 10.0, | |
stopOnTerminate: false, | |
startOnBoot: true, | |
debug: true, | |
logLevel: bg.Config.LOG_LEVEL_VERBOSE, | |
reset: true | |
)).then((bg.State state) { | |
setState(() { | |
_enabled = state.enabled; | |
_isMoving = state.isMoving; | |
}); | |
}); | |
} | |
void _onClickEnable(enabled) { | |
if (enabled) { | |
bg.BackgroundGeolocation.start().then((bg.State state) { | |
print('[start] success $state'); | |
setState(() { | |
_enabled = state.enabled; | |
_isMoving = state.isMoving; | |
}); | |
}); | |
} else { | |
bg.BackgroundGeolocation.stop().then((bg.State state) { | |
print('[stop] success: $state'); | |
// Reset odometer. | |
bg.BackgroundGeolocation.setOdometer(0.0); | |
setState(() { | |
_odometer = '0.0'; | |
_enabled = state.enabled; | |
_isMoving = state.isMoving; | |
}); | |
}); | |
} | |
} | |
// Manually toggle the tracking state: moving vs stationary | |
void _onClickChangePace() { | |
setState(() { | |
_isMoving = !_isMoving; | |
}); | |
print("[onClickChangePace] -> $_isMoving"); | |
bg.BackgroundGeolocation.changePace(_isMoving).then((bool isMoving) { | |
print('[changePace] success $isMoving'); | |
}).catchError((e) { | |
print('[changePace] ERROR: ' + e.code.toString()); | |
}); | |
} | |
// Manually fetch the current position. | |
void _onClickGetCurrentPosition() { | |
bg.BackgroundGeolocation.getCurrentPosition( | |
persist: false, // <-- do not persist this location | |
desiredAccuracy: 0, // <-- desire best possible accuracy | |
timeout: 30000, // <-- wait 30s before giving up. | |
samples: 3 // <-- sample 3 location before selecting best. | |
).then((bg.Location location) { | |
print('[getCurrentPosition] - $location'); | |
}).catchError((error) { | |
print('[getCurrentPosition] ERROR: $error'); | |
}); | |
} | |
//// | |
// Event handlers | |
// | |
void _onLocation(bg.Location location) { | |
print('[location] - $location'); | |
String odometerKM = (location.odometer / 1000.0).toStringAsFixed(1); | |
setState(() { | |
_content = encoder.convert(location.toMap()); | |
_odometer = odometerKM; | |
}); | |
} | |
void _onMotionChange(bg.Location location) { | |
print('[motionchange] - $location'); | |
} | |
void _onActivityChange(bg.ActivityChangeEvent event) { | |
print('[activitychange] - $event'); | |
setState(() { | |
_motionActivity = event.activity; | |
}); | |
} | |
void _onProviderChange(bg.ProviderChangeEvent event) { | |
print('$event'); | |
setState(() { | |
_content = encoder.convert(event.toMap()); | |
}); | |
} | |
void _onConnectivityChange(bg.ConnectivityChangeEvent event) { | |
print('$event'); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
appBar: AppBar( | |
title: const Text('Background Geolocation'), | |
actions: <Widget>[ | |
Switch( | |
value: _enabled, | |
onChanged: _onClickEnable | |
), | |
] | |
), | |
body: SingleChildScrollView( | |
child: Text('$_content') | |
), | |
bottomNavigationBar: BottomAppBar( | |
child: Container( | |
padding: const EdgeInsets.only(left: 5.0, right: 5.0), | |
child: Row( | |
mainAxisSize: MainAxisSize.max, | |
mainAxisAlignment: MainAxisAlignment.spaceBetween, | |
children: <Widget>[ | |
IconButton( | |
icon: Icon(Icons.gps_fixed), | |
onPressed: _onClickGetCurrentPosition, | |
), | |
Text('$_motionActivity · $_odometer km'), | |
MaterialButton( | |
minWidth: 50.0, | |
child: Icon((_isMoving) ? Icons.pause : Icons.play_arrow, color: Colors.white), | |
color: (_isMoving) ? Colors.red : Colors.green, | |
onPressed: _onClickChangePace | |
) | |
] | |
) | |
) | |
), | |
); | |
} | |
} |
returning read-only value.
A resd-only value is all the plug-in wants.. This is not a problem. I’m aware of this warning.
A gist is not the place to seek tech support. Post an issue at the GitHub repo.
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I am using this flutter_background_geolocation package to fetch the user's current location from the background service (workmanager). but it shows this error
Error:
Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
How can I resolve it? Although I am fetching location correctly when I used code onPressed listener. but on background service, it gave me that error and did not fetch the location.