Open frxk opened 7 months ago
liodali
commented
7 months ago startLocationUpdating is designed for that only receive user location without control the map
can you share some part of your code to see because if you use it the map should not move only receive the location in onLocationChanged
that give you possibility to do you own custom logic
we have enableTracking that contain our logic for that
frxk
commented
7 months ago HI, I found the error on my code. When I enable the tracking location, the controller.currentLocation() function inside onLocationChanged center the map. Commenting that line everything works. Below is the extract of the code. Thank you
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_osm_plugin/flutter_osm_plugin.dart';
//-----------------MAP--------
class OpenStreetMapsTest extends StatefulWidget {
const OpenStreetMapsTest({Key? key}) : super(key: key);
@override
State<OpenStreetMapsTest> createState() => _OpenStreetMapsState();
}
ValueNotifier<bool> showFab = ValueNotifier(true);
ValueNotifier<bool> statusTrackPosizione = ValueNotifier(false);
late MapController controller;
class _OpenStreetMapsState extends State<OpenStreetMapsTest> with OSMMixinObserver,TickerProviderStateMixin {
@override
void initState() {
super.initState();
controller = MapController(
initPosition: GeoPoint(latitude: 41.450202, longitude: 12.234500),
useExternalTracking: statusTrackPosizione.value,
);
controller.addObserver(this);
scaffoldKey = GlobalKey<ScaffoldState>();
}
@override
Future<void> mapIsReady(bool isReady) async {
if (isReady) {}
}
@override
void dispose() {
// Clean up the controller when the widget is removed from the
controller.dispose();
showFab = ValueNotifier(true);
statusTrackPosizione = ValueNotifier(false);
super.dispose();
}
late GlobalKey<ScaffoldState> scaffoldKey;
@override
Widget build(BuildContext context) {
//double sidebarInfoTrackWidth=MediaQuery.of(context).size.width;
return Scaffold(
key: scaffoldKey,
backgroundColor: Colors.white,
body: Mappa(),
floatingActionButton: ValueListenableBuilder<bool>(
valueListenable: showFab,
builder: (ctx, isShow, child) {
if (!isShow) {
return const SizedBox.shrink();
}
return child!;
},
child: FloatingActionButton(
backgroundColor: Colors.black,
onPressed: () {
TrackPosizione();
},
tooltip: "Tracking",
child: ValueListenableBuilder<bool>(
valueListenable: statusTrackPosizione,
builder: (ctx, isTracking, _) {
if (isTracking) {
return const Icon(Icons.my_location);
}
return const Icon(Icons.gps_off_sharp);
},
),
),
),
);
}
//----------FUNZIONI della Mappa-------------------------
//Mappa
OSMFlutter Mappa() {
return OSMFlutter(
controller: controller,
osmOption: OSMOption(
/*userTrackingOption: UserTrackingOption(
enableTracking: true,
unFollowUser: false,
),*/
enableRotationByGesture: false,
showContributorBadgeForOSM: false,
showDefaultInfoWindow: false,
//popup info waypoint
isPicker: false,
zoomOption: const ZoomOption(
initZoom: 16,
minZoomLevel: 2,
maxZoomLevel: 19,
stepZoom: 1.0,
),
userLocationMarker: UserLocationMaker(
personMarker: const MarkerIcon(
icon: Icon(
Icons.directions_walk,
color: Colors.red,
size: 80,
shadows: [
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 10.0,
color: Colors.blue),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 10.0,
color: Colors.blue),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 10.0,
color: Colors.blue),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 4.0,
color: Colors.black),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 4.0,
color: Colors.black),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 7.0,
color: Colors.black)
],
),
),
directionArrowMarker: const MarkerIcon(
icon: Icon(
Icons.navigation,
color: Colors.red,
size: 90,
shadows: [
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 18.0,
color: Colors.blue),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 18.0,
color: Colors.blue),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 18.0,
color: Colors.blue),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 4.0,
color: Colors.black),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 4.0,
color: Colors.black),
Shadow(offset: Offset(0.0, 0.0),
blurRadius: 7.0,
color: Colors.black)
],
),
),
),
),
onLocationChanged: (myLocation) {
if (statusTrackPosizione.value == true) {
//controller.currentLocation();
}
},
onGeoPointClicked: (geoPoint) async {},
);
}
//segui posizione--------
void TrackPosizione() {
if (!statusTrackPosizione.value) {
controller.startLocationUpdating(enableStopFollow: true, useDirectionMarker: true).whenComplete(() {
statusTrackPosizione.value = true;
});
ScaffoldMessenger.of(context)
..removeCurrentSnackBar()
..showSnackBar(Snackbar("Tracking GPS enabled"));
/*controller.currentLocation().whenComplete(() {
controller.enableTracking(enableStopFollow: true).whenComplete((){statusTrackPosizione.value=true;});
ScaffoldMessenger.of(context)
..removeCurrentSnackBar()
..showSnackBar(Snackbar("Tracking GPS enabled"));
});*/
} else {
//controller.disabledTracking().whenComplete((){statusTrackPosizione.value=false;});
controller.stopLocationUpdating().whenComplete(() {
statusTrackPosizione.value = false;
});
ScaffoldMessenger.of(context)
..removeCurrentSnackBar()
..showSnackBar(Snackbar("Tracking GPS disabled"));
}
}
SnackBar Snackbar(String Testo) {
return SnackBar(
behavior: SnackBarBehavior.floating,
margin: EdgeInsets.only(left: 8, right: 8, bottom: MediaQuery
.of(context)
.size
.height * 0.1),
backgroundColor: Colors.white,
elevation: 10,
action: SnackBarAction(
label: "Close", textColor: Colors.black, onPressed: () {
ScaffoldMessenger.of(context).hideCurrentSnackBar();
}),
//shape: StadiumBorder(),
content: Container(
constraints: BoxConstraints(maxWidth: (MediaQuery
.of(context)
.size
.width - 10)),
child: FittedBox(
fit: BoxFit.scaleDown,
child: Row(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: [
const Icon(
Icons.info_outline_rounded, color: Colors.white, size: 20),
const SizedBox(width: 5,),
Text(Testo, maxLines: 2,
style: TextStyle(fontSize: 15, color: Colors.black)),
],
),
),
),
duration: const Duration(seconds: 1),
);
}
}ah call controller.currentLocation() outside of the onLocationChanged and in general is used with enableTracking
or separate depend on the logic or use case
startLocationUpdation just that you will receive the user location without using our internal logic that we already impl in enableTracking
tmp78
commented
7 months ago @liodali , Could you please check if this piece of code is causing an error for you?
await _controller.currentLocation();
await _controller.enableTracking(
enableStopFollow: true,
disableUserMarkerRotation: false,
anchor: Anchor.center,
);On the iOS simulator everything works fine, on the Android simulator it gives the following error:
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(400, java.lang.NullPointerException: getLastKnownLocation(...) must not be null
E/flutter ( 5876): at hamza.dali.flutter_osm_plugin.overlays.CustomLocationManager.enableFollowLocation(CustomLocation.kt:119)
E/flutter ( 5876): at hamza.dali.flutter_osm_plugin.overlays.CustomLocationManager.toggleFollow(CustomLocation.kt:252)
E/flutter ( 5876): at hamza.dali.flutter_osm_plugin.FlutterOsmView.trackUserLocation(FlutterOsmView.kt:1171)
E/flutter ( 5876): at hamza.dali.flutter_osm_plugin.FlutterOsmView.onMethodCall(FlutterOsmView.kt:463)
E/flutter ( 5876): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/flutter ( 5876): at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
E/flutter ( 5876): at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/flutter ( 5876): at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/flutter ( 5876): at android.os.Handler.handleCallback(Handler.java:938)
E/flutter ( 5876): at android.os.Handler.dispatchMessage(Handler.java:99)
E/flutter ( 5876): at android.os.Looper.loopOnce(Looper.java:201)
E/flutter ( 5876): at android.os.Looper.loop(Looper.java:288)
E/flutter ( 5876): at android.app.ActivityThread.main(ActivityThread.java:7839)
E/flutter ( 5876): at java.lang.reflect.Method.invoke(Native Method)
E/flutter ( 5876): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
E/flutter ( 5876): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
E/flutter ( 5876): , , null)
E/flutter ( 5876): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:651:7)
E/flutter ( 5876): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:334:18)
E/flutter ( 5876): <asynchronous suspension>
E/flutter ( 5876): #2 MethodChannelOSM.enableTracking (package:flutter_osm_interface/src/channel/osm_method_channel.dart:280:5)
E/flutter ( 5876): <asynchronous suspension>
E/flutter ( 5876): #3 MobileOSMController.enableTracking (package:flutter_osm_plugin/src/controller/osm/osm_controller.dart:467:5)
E/flutter ( 5876): <asynchronous suspension>
E/flutter ( 5876): #4 MapController.enableTracking (package:flutter_osm_plugin/src/controller/map_controller.dart:330:5)
E/flutter ( 5876): <asynchronous suspension>
E/flutter ( 5876): #5 MapManager.switchTracking (package:kutno/models/map_manager.dart:156:7)
E/flutter ( 5876): <asynchronous suspension>
E/flutter ( 5876): The next executions are OK. This problem doesn't exist on iOS. And I think it worked fine on Android in previous versions as well.
liodali
commented
7 months ago I will do fix for that
Hi and thank you for this useful library. The question is that when i call the function
controller.startLocationUpdating(enableStopFollow: true,useDirectionMarker: true)
the map is centered on position, but not showing the user marker.
Instead if i execute this code, the user marker is showed.
controller.currentLocation().whenComplete((){ controller.enableTracking(enableStopFollow: true); });
Thank you