94 lines
2.8 KiB
Dart
94 lines
2.8 KiB
Dart
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import 'dart:async';
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import 'package:geolocator/geolocator.dart';
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import 'location_source.dart';
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/// Telefon beépített GPS-ét használó helymeghatározási forrás.
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///
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/// Android háttér-működéshez a [flutter_foreground_task] kezeli
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/// az előtér-szolgáltatást (notification), ez az osztály csak
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/// a Geolocator streamet konfigurálja.
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class PhoneGpsSource implements LocationSource {
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@override
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String get displayName => 'Telefon GPS';
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StreamController<SourcePosition>? _controller;
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StreamSubscription<Position>? _positionSub;
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/// Frissítési intervallum ms-ban.
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final int intervalMs;
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/// Minimális elmozdulás méterben új pont előtt.
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final double distanceFilter;
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PhoneGpsSource({
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this.intervalMs = 1000,
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this.distanceFilter = 1.0,
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});
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@override
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bool get isAvailable => _controller != null && !(_controller!.isClosed);
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@override
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Stream<SourcePosition> get positionStream {
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_controller = StreamController<SourcePosition>.broadcast();
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_startListening();
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return _controller!.stream;
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}
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Future<void> _startListening() async {
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// Engedélyek ellenőrzése
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LocationPermission permission = await Geolocator.checkPermission();
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if (permission == LocationPermission.denied) {
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permission = await Geolocator.requestPermission();
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}
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if (permission == LocationPermission.deniedForever ||
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permission == LocationPermission.denied) {
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_controller?.addError(
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Exception('Helymeghatározási engedély megtagadva. '
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'Kérjük, engedélyezze a beállításokban.'),
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);
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return;
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}
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final settings = AndroidSettings(
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accuracy: LocationAccuracy.high,
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distanceFilter: distanceFilter.toInt(),
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intervalDuration: Duration(milliseconds: intervalMs),
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// Háttér-helymeghatározáshoz szükséges — a foreground_task
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// notification biztosítja a jogszerű háttér-használatot.
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foregroundNotificationConfig: const ForegroundNotificationConfig(
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notificationText: 'Track rögzítése folyamatban',
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notificationTitle: 'Terepi Segéd – Nyomvonal',
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enableWakeLock: true,
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),
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);
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_positionSub = Geolocator.getPositionStream(
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locationSettings: settings,
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).listen(
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(Position pos) {
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_controller?.add(SourcePosition(
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latitude: pos.latitude,
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longitude: pos.longitude,
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altitude: pos.altitude,
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accuracy: pos.accuracy,
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verticalAccuracy: pos.altitudeAccuracy,
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speed: pos.speed,
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heading: pos.heading,
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timestamp: pos.timestamp,
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source: displayName,
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));
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},
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onError: (e) => _controller?.addError(e),
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);
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}
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@override
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Future<void> dispose() async {
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await _positionSub?.cancel();
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await _controller?.close();
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_controller = null;
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}
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}
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