Fetch Route and Launch Navigation

1import 'package:flutter/cupertino.dart';
2import 'package:flutter/material.dart';
3import 'package:nb_navigation_flutter/nb_navigation_flutter.dart';
4
5class LaunchNavigation extends StatefulWidget {
6  static const String title = "Route Request and Launch Navigation";
7
8  @override
9  LaunchNavigationState createState() => LaunchNavigationState();
10}
11
12class LaunchNavigationState extends State<LaunchNavigation> {
13  List<DirectionsRoute> routes = [];
14
15  @override
16  void initState() {
17    super.initState();
18  }
19
20  @override
21  Widget build(BuildContext context) {
22    return Scaffold(
23      appBar: AppBar(
24        title: const Text(LaunchNavigation.title),
25      ),
26      body: Padding(
27        padding: const EdgeInsets.all(8.0),
28        child: Column(
29          children: [
30            Row(
31              children: [
32                const Padding(padding: EdgeInsets.only(left: 8)),
33                ElevatedButton(
34                  style: ButtonStyle(
35                    backgroundColor: MaterialStateProperty.all(Colors.blueAccent),
36                  ),
37                  onPressed: () {
38                    _fetchRoute();
39                  },
40                  child: const Text("Fetch Route"),
41                ),
42                const Padding(padding: EdgeInsets.only(left: 8)),
43                ElevatedButton(
44                  style: ButtonStyle(
45                      backgroundColor: MaterialStateProperty.all(routes.isEmpty ? Colors.grey : Colors.blueAccent),
46                      enableFeedback: routes.isNotEmpty),
47                  onPressed: () {
48                    _startNavigation();
49                  },
50                  child: const Text("Start Navigation"),
51                ),
52              ],
53            ),
54            Padding(
55              padding: const EdgeInsets.all(8),
56              child: Text("route info: ${routes.isEmpty ? "" : routes.first.geometry ?? ""}"),
57            )
58          ],
59        ),
60      ),
61    );
62  }
63
64  void _fetchRoute() async {
65    LatLng origin = LatLng(1.312533169133601, 103.75986708439264);
66    LatLng dest = LatLng( 1.310473772283314, 103.77982271935586);
67
68    RouteRequestParams requestParams = RouteRequestParams(
69      origin: origin,
70      destination: dest,
71      unit: SupportedUnits.imperial,
72      mode: ValidModes.car,
73      geometryType: SupportedGeometry.polyline,
74    );
75
76    await NBNavigation.fetchRoute(requestParams, (routes, error) async {
77      if (routes.isNotEmpty) {
78        setState(() {
79          this.routes = routes;
80        });
81      } else if (error != null) {
82        print("====error====${error}");
83      }
84    });
85  }
86
87  void _startNavigation() {
88    if (routes.isEmpty) return;
89    NavigationLauncherConfig config = NavigationLauncherConfig(route: routes.first, routes: routes);
90    config.locationLayerRenderMode = LocationLayerRenderMode.GPS;
91    config.enableDissolvedRouteLine = false;
92    config.shouldSimulateRoute = true;
93    config.themeMode = NavigationThemeMode.system;
94    config.useCustomNavigationStyle = false;
95    NBNavigation.startNavigation(config);
96  }
97
98  @override
99  void dispose() {
100    super.dispose();
101  }
102}