vk_location_sharing 1.0.0

A Flutter package for implementing location sharing with foreground streams and periodic background updates.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:vk_location_sharing/vk_location_sharing.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Location Sharing Example',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const LocationHome(),
    );
  }
}

class LocationHome extends StatefulWidget {
  const LocationHome({super.key});

  @override
  State<LocationHome> createState() => _LocationHomeState();
}

class _LocationHomeState extends State<LocationHome> {
  final _vkLocation = VkLocationSharing();
  Position? _foregroundPosition;
  Position? _backgroundPosition;
  bool _isSharing = false;
  bool _handleSeparately = false;

  @override
  void initState() {
    super.initState();
    _initializeLocation();
  }

  Future<void> _initializeLocation() async {
    // Initialize the package with configuration
    await _vkLocation.initialize(
      config: LocationConfig(
        handleForegroundAndBackgroundSeparately: _handleSeparately,
        accuracy: LocationAccuracy.best,
        distanceFilter: 5,
        backgroundUpdateFrequency: const Duration(minutes: 15),
        onLocationUpdate: (position, {required isBackground}) async {
          // Custom callback to handle location data
          // You can send it to your backend, analytics, etc.
          if (isBackground) {
            print(
              'Background Location: ${position.latitude}, ${position.longitude}',
            );
          } else {
            print(
              'Foreground Location: ${position.latitude}, ${position.longitude}',
            );
          }
        },
      ),
    );

    // Listen to foreground location updates
    _vkLocation.foregroundLocationStream.listen(
      (position) {
        if (mounted) {
          setState(() {
            _foregroundPosition = position;
          });
        }
      },
      onError: (error) {
        print('Foreground stream error: $error');
      },
    );

    // Listen to background location updates (if handling separately)
    if (_handleSeparately) {
      _vkLocation.backgroundLocationStream.listen(
        (position) {
          if (mounted) {
            setState(() {
              _backgroundPosition = position;
            });
          }
        },
        onError: (error) {
          print('Background stream error: $error');
        },
      );
    }
  }

  Future<void> _toggleSharing() async {
    if (!_isSharing) {
      // Start sharing
      final success = await _vkLocation.shareLocation(
        includeForeground: true,
        includeBackground: true,
      );

      if (success) {
        setState(() {
          _isSharing = true;
        });
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Location sharing started!')),
          );
        }
      } else {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(
              content: Text('Location permissions denied'),
              backgroundColor: Colors.red,
            ),
          );
        }
      }
    } else {
      // Stop sharing
      await _vkLocation.stopSharing(
        stopForeground: true,
        stopBackground: true,
      );

      setState(() {
        _isSharing = false;
      });

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Location sharing stopped')),
        );
      }
    }
  }

  @override
  void dispose() {
    _vkLocation.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('VK Location Sharing'),
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
      ),
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.all(20.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.start,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              // Configuration section
              Card(
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      const Text(
                        'Configuration',
                        style: TextStyle(
                          fontSize: 18,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                      const SizedBox(height: 12),
                      CheckboxListTile(
                        title: const Text(
                            'Handle Foreground & Background Separately'),
                        value: _handleSeparately,
                        onChanged: _isSharing
                            ? null
                            : (value) {
                                setState(() {
                                  _handleSeparately = value ?? false;
                                });
                              },
                        subtitle: const Text(
                          'If disabled, all updates go to foreground stream',
                          style: TextStyle(fontSize: 12),
                        ),
                      ),
                    ],
                  ),
                ),
              ),
              const SizedBox(height: 20),

              // Foreground location display
              Card(
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      const Text(
                        'Foreground Location',
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                      const SizedBox(height: 12),
                      if (_foregroundPosition != null)
                        Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Text(
                              'Latitude: ${_foregroundPosition!.latitude.toStringAsFixed(6)}',
                            ),
                            Text(
                              'Longitude: ${_foregroundPosition!.longitude.toStringAsFixed(6)}',
                            ),
                            Text(
                              'Accuracy: ${_foregroundPosition!.accuracy.toStringAsFixed(2)}m',
                            ),
                            Text(
                              'Altitude: ${_foregroundPosition!.altitude.toStringAsFixed(2)}m',
                            ),
                            Text(
                              'Speed: ${(_foregroundPosition!.speed * 3.6).toStringAsFixed(2)}km/h',
                            ),
                            Text(
                              'Time: ${_foregroundPosition!.timestamp}',
                              style: const TextStyle(fontSize: 12),
                            ),
                          ],
                        )
                      else
                        const Text(
                          'No foreground location data yet',
                          style: TextStyle(color: Colors.grey),
                        ),
                    ],
                  ),
                ),
              ),
              const SizedBox(height: 20),

              // Background location display (if handling separately)
              if (_handleSeparately)
                Card(
                  child: Padding(
                    padding: const EdgeInsets.all(16.0),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        const Text(
                          'Background Location',
                          style: TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                        const SizedBox(height: 12),
                        if (_backgroundPosition != null)
                          Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Text(
                                'Latitude: ${_backgroundPosition!.latitude.toStringAsFixed(6)}',
                              ),
                              Text(
                                'Longitude: ${_backgroundPosition!.longitude.toStringAsFixed(6)}',
                              ),
                              Text(
                                'Time: ${_backgroundPosition!.timestamp}',
                                style: const TextStyle(fontSize: 12),
                              ),
                            ],
                          )
                        else
                          const Text(
                            'No background location data yet',
                            style: TextStyle(color: Colors.grey),
                          ),
                      ],
                    ),
                  ),
                ),
              const SizedBox(height: 30),

              // Main action button
              ElevatedButton.icon(
                onPressed: _toggleSharing,
                icon: Icon(_isSharing ? Icons.stop : Icons.play_arrow),
                label: Text(
                  _isSharing
                      ? 'Stop Sharing Location'
                      : 'Start Sharing Location',
                  style: const TextStyle(fontSize: 16),
                ),
                style: ElevatedButton.styleFrom(
                  backgroundColor:
                      _isSharing ? Colors.red.shade400 : Colors.green.shade400,
                  foregroundColor: Colors.white,
                  padding: const EdgeInsets.symmetric(vertical: 16),
                ),
              ),
              const SizedBox(height: 20),

              // Info section
              Card(
                color: Colors.blue.shade50,
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: const [
                      Text(
                        'ℹ️ Info',
                        style: TextStyle(fontWeight: FontWeight.bold),
                      ),
                      SizedBox(height: 8),
                      Text(
                        '• Foreground: Real-time location updates',
                        style: TextStyle(fontSize: 12),
                      ),
                      Text(
                        '• Background: Periodic updates every 15 minutes',
                        style: TextStyle(fontSize: 12),
                      ),
                      Text(
                        '• Custom callback executes with each location update',
                        style: TextStyle(fontSize: 12),
                      ),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}