Implement complete GPS speedometer functionality
Features implemented: - Real-time GPS speed tracking with permission handling - Customizable speed units (km/h, mph) with persistent settings - Digital and analog speedometer display styles - Dark/light theme support with system integration - Optional metrics: coordinates, distance, trip time, GPS accuracy - Trip reset functionality and error handling - Modular architecture with Provider state management Technical details: - Added dependencies: geolocator, permission_handler, provider, shared_preferences - Configured Android location permissions (FINE_LOCATION, COARSE_LOCATION) - Portrait orientation lock for mobile-first experience - Extensible settings system for future customization options - Clean separation of concerns: providers, screens, widgets 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Mikkeli Matlock
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import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:geolocator/geolocator.dart';
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import 'package:permission_handler/permission_handler.dart';
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class LocationProvider extends ChangeNotifier {
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Position? _currentPosition;
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double _currentSpeed = 0.0;
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double _totalDistance = 0.0;
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DateTime? _tripStartTime;
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bool _isTracking = false;
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bool _hasLocationPermission = false;
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String _errorMessage = '';
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StreamSubscription<Position>? _positionStreamSubscription;
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Position? _previousPosition;
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Position? get currentPosition => _currentPosition;
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double get currentSpeed => _currentSpeed;
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double get totalDistance => _totalDistance;
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DateTime? get tripStartTime => _tripStartTime;
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bool get isTracking => _isTracking;
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bool get hasLocationPermission => _hasLocationPermission;
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String get errorMessage => _errorMessage;
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double? get latitude => _currentPosition?.latitude;
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double? get longitude => _currentPosition?.longitude;
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double? get accuracy => _currentPosition?.accuracy;
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Duration get tripDuration {
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if (_tripStartTime == null) return Duration.zero;
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return DateTime.now().difference(_tripStartTime!);
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}
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Future<void> initializeLocation() async {
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await _checkLocationPermission();
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if (_hasLocationPermission) {
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await _startLocationTracking();
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}
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}
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Future<void> _checkLocationPermission() async {
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final permission = await Permission.locationWhenInUse.status;
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if (permission.isDenied) {
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final result = await Permission.locationWhenInUse.request();
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_hasLocationPermission = result.isGranted;
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} else if (permission.isPermanentlyDenied) {
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_hasLocationPermission = false;
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_errorMessage = 'Location permission is permanently denied. Please enable it in settings.';
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} else {
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_hasLocationPermission = permission.isGranted;
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}
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if (!_hasLocationPermission) {
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_errorMessage = 'Location permission is required for the speedometer to work.';
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} else {
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_errorMessage = '';
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}
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notifyListeners();
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}
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Future<void> _startLocationTracking() async {
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if (!_hasLocationPermission) return;
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try {
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final isLocationServiceEnabled = await Geolocator.isLocationServiceEnabled();
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if (!isLocationServiceEnabled) {
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_errorMessage = 'Location services are disabled. Please enable them.';
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notifyListeners();
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return;
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}
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const locationSettings = LocationSettings(
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accuracy: LocationAccuracy.bestForNavigation,
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distanceFilter: 0,
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);
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_positionStreamSubscription = Geolocator.getPositionStream(
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locationSettings: locationSettings,
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).listen(
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_onLocationUpdate,
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onError: (error) {
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_errorMessage = 'Location error: $error';
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notifyListeners();
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},
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);
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_isTracking = true;
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_tripStartTime = DateTime.now();
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notifyListeners();
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} catch (e) {
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_errorMessage = 'Failed to start location tracking: $e';
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notifyListeners();
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}
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}
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void _onLocationUpdate(Position position) {
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_currentPosition = position;
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_currentSpeed = position.speed;
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if (_previousPosition != null) {
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final distance = Geolocator.distanceBetween(
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_previousPosition!.latitude,
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_previousPosition!.longitude,
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position.latitude,
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position.longitude,
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);
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_totalDistance += distance;
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}
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_previousPosition = position;
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_errorMessage = '';
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notifyListeners();
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}
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void resetTrip() {
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_totalDistance = 0.0;
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_tripStartTime = DateTime.now();
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_previousPosition = _currentPosition;
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notifyListeners();
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}
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Future<void> stopTracking() async {
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await _positionStreamSubscription?.cancel();
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_positionStreamSubscription = null;
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_isTracking = false;
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notifyListeners();
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}
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@override
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void dispose() {
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stopTracking();
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super.dispose();
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}
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}
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@@ -0,0 +1,98 @@
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import 'package:flutter/material.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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enum SpeedUnit { kmh, mph }
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enum SpeedometerStyle { digital, analog }
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class SettingsProvider extends ChangeNotifier {
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bool _isDarkMode = false;
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SpeedUnit _speedUnit = SpeedUnit.kmh;
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SpeedometerStyle _speedometerStyle = SpeedometerStyle.digital;
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bool _showCoordinates = false;
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bool _showDistance = false;
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bool _showTripTime = false;
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bool _showAccuracy = false;
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bool get isDarkMode => _isDarkMode;
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SpeedUnit get speedUnit => _speedUnit;
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SpeedometerStyle get speedometerStyle => _speedometerStyle;
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bool get showCoordinates => _showCoordinates;
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bool get showDistance => _showDistance;
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bool get showTripTime => _showTripTime;
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bool get showAccuracy => _showAccuracy;
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String get speedUnitString => _speedUnit == SpeedUnit.kmh ? 'km/h' : 'mph';
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SettingsProvider() {
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_loadSettings();
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}
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Future<void> _loadSettings() async {
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final prefs = await SharedPreferences.getInstance();
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_isDarkMode = prefs.getBool('isDarkMode') ?? false;
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_speedUnit = SpeedUnit.values[prefs.getInt('speedUnit') ?? 0];
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_speedometerStyle = SpeedometerStyle.values[prefs.getInt('speedometerStyle') ?? 0];
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_showCoordinates = prefs.getBool('showCoordinates') ?? false;
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_showDistance = prefs.getBool('showDistance') ?? false;
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_showTripTime = prefs.getBool('showTripTime') ?? false;
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_showAccuracy = prefs.getBool('showAccuracy') ?? false;
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notifyListeners();
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}
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Future<void> setDarkMode(bool value) async {
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_isDarkMode = value;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setBool('isDarkMode', value);
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notifyListeners();
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}
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Future<void> setSpeedUnit(SpeedUnit unit) async {
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_speedUnit = unit;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setInt('speedUnit', unit.index);
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notifyListeners();
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}
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Future<void> setSpeedometerStyle(SpeedometerStyle style) async {
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_speedometerStyle = style;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setInt('speedometerStyle', style.index);
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notifyListeners();
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}
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Future<void> setShowCoordinates(bool value) async {
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_showCoordinates = value;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setBool('showCoordinates', value);
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notifyListeners();
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}
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Future<void> setShowDistance(bool value) async {
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_showDistance = value;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setBool('showDistance', value);
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notifyListeners();
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}
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Future<void> setShowTripTime(bool value) async {
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_showTripTime = value;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setBool('showTripTime', value);
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notifyListeners();
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}
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Future<void> setShowAccuracy(bool value) async {
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_showAccuracy = value;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setBool('showAccuracy', value);
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notifyListeners();
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}
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double convertSpeed(double speedMps) {
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if (_speedUnit == SpeedUnit.kmh) {
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return speedMps * 3.6;
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} else {
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return speedMps * 2.237;
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}
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}
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}
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