Nextbillion Navigation Flutter

Instroduction

Prerequisites

• Access Key
• Android minSdkVersion 17+
• iOS 11+
• Flutter 3.10+
• Pod 1.11.3+
• Ensure that Build Libraries for Distribution (available under build settings) is set to No.

Installation

Dependency

Add the following dependency to your project pubspec.yaml file to use the NB Navigation Flutter Plugin add the dependency to the pubspec.yaml (change the version to actual version that you want to use):

dependencies:
  nb_navigation_flutter: {version}

Import

Import the navigation plugin in your code

import 'package:nb_navigation_flutter/nb_navigation_flutter.dart';

Initialization

To run the Navigation Flutter Plugin you will need to configure the NB Maps Token at the beginning of your flutter app using NextBillion.initNextBillion(YOUR_ACCESS_KEY).

import 'package:nb_navigation_flutter/nb_navigation_flutter.dart';

class _NavigationDemoState extends State<NavigationDemo> {
  @override
  void initState() {
    super.initState();
    NextBillion.initNextBillion(YOUR_ACCESS_KEY);
  }
}

Required Permissions

Configuration permissions

You need to grant location permission in order to use the location component of the NB Navigation Flutter Plugin, declare the permission for both platforms:

Android

Add the following permissions to the manifest:

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>

iOS

Add the following to the Runner/Info.plist to explain why you need access to the location data:

 <key>NSLocationWhenInUseUsageDescription</key>
    <string>[Your explanation here]</string>

Observe and Tracking User Location

• add the callback onUserLocationUpdated(UserLocation location)
• animate camera to user location within onStyleLoadedCallback

void _onMapCreated(NextbillionMapController controller) {
    this.controller = controller;
  }

_onUserLocationUpdate(UserLocation location) {
    currentLocation = location;
  }

_onStyleLoadedCallback() {
    if (currentLocation != null) {
      controller?.animateCamera(CameraUpdate.newLatLngZoom(currentLocation!.position, 14), duration: Duration(milliseconds: 400));
    }
  }

NBMap(
     onMapCreated: _onMapCreated,
     onStyleLoadedCallback: _onStyleLoadedCallback,
     initialCameraPosition: const CameraPosition(
            target: LatLng(0, 0),
            zoom: 14.0,
          ),
     trackCameraPosition: true,
     myLocationEnabled: true,
     myLocationTrackingMode: MyLocationTrackingMode.Tracking,
     onUserLocationUpdated: _onUserLocationUpdate,
)

Usage

NB Maps

If you need to use Maps related functions, for example: Display a Map widget, please refer to NB Flutter Maps Plugin

Fetch Routes

You can request routes with RouteRequestParams using NBNavigation, for the supported params, please refer to Navigation API

Create RouteRequestParams

RouteRequestParams requestParams = RouteRequestParams(
      origin: origin,
      destination: dest,
      // waypoints: [waypoint1, waypoint2],
      // language: 'en',
      // alternatives: true,
      // overview: ValidOverview.simplified,
      // avoid: [SupportedAvoid.toll, SupportedAvoid.ferry],
      // option: SupportedOption.flexible,
      // unit: SupportedUnits.imperial,
      // mode: ValidModes.car,
      // geometry: SupportedGeometry.polyline,
    );

Fetch routes

Fetch route with requestParams using NBNavigation.fetchRoute(), and obtain the route result from Future<DirectionsRouteResponse>.

DirectionsRouteResponse routeResponse = await NBNavigation.fetchRoute(requestParams);

Draw routes

After getting the routes, you can draw routes on the map view using NavNextBillionMap, If you need to use Maps related functions, for example: Display a Map widget, please refer to NB Flutter Maps Plugin

Create NavNextBillionMap with NextbillionMapController in NBMap widget’s onStyleLoadedCallback callback:

void _onMapCreated(NextbillionMapController controller) {
    this.controller = controller;
}

void _onStyleLoaded() {
    if (controller != null) async {
      navNextBillionMap = await NavNextBillionMap.create(controller!);
    }
  }

Draw routes

navNextBillionMap.drawRoute(routes);

Fit Map camera to route points

void fitCameraToBounds(List<DirectionsRoute> routes) {
    List<LatLng> multiPoints = [];
    for (var route in routes) {
       var routePoints = decode(route.geometry ?? '', _getDecodePrecision(route.routeOptions));
       multiPoints.addAll(routePoints);
    }
    if (multiPoints.isNotEmpty) {
      var latLngBounds = LatLngBounds.fromMultiLatLng(multiPoints);
      controller?.animateCamera(CameraUpdate.newLatLngBounds(latLngBounds, top: 50, left: 50, right: 50, bottom: 50));
    }
  }

  int _getDecodePrecision(RouteRequestParams? routeOptions) {
    return routeOptions?.geometry == SupportedGeometry.polyline ? PRECISION : PRECISION_6;
  }

Clear routes

 navNextBillionMap.clearRoute();

Toggle Alternative route visibility

 navNextBillionMap.toggleAlternativeVisibilityWith(visible);

Toggle RouteDurationSymbol visibility

 navNextBillionMap.toggleDurationSymbolVisibilityWith(visible);

Add RouteSelected Listener. You can add route switching listener in onMapClick callback

onMapClick(Point<double> point, LatLng coordinates) {
    navNextBillionMap.addRouteSelectedListener(coordinates, (selectedRouteIndex) {})
}

Start navigation

Start navigation with NavigationLauncherConfig

• route: The selected route for directions
• routes: A list of available routes
• themeMode: The theme mode for navigation UI, default value is system
  • system: following system mode
  • light
  • dark
• locationLayerRenderMode: The rendering mode for the location layer, default value is LocationLayerRenderMode.GPS
• shouldSimulateRoute: Whether to simulate the route during navigation, default value is false
• enableDissolvedRouteLine: Whether to enable the dissolved route line during navigation, default value is true

NavigationLauncherConfig config = NavigationLauncherConfig(route: routes.first, routes: routes, shouldSimulateRoute: true);

NBNavigation.startNavigation(config);

Launch Embedded NavigationView

NBNavigationView is a customizable navigation view widget designed to provide seamless navigation experiences in your Flutter application. It offers various configuration options to cater to different navigation requirements, such as theme modes, location layer render modes, and custom styles.

• Important :If you want to use the NavigationView, you need to to make the MainActivity extend FlutterFragmentActivity instead of FlutterActivity in the Android project.

  class MainActivity: FlutterFragmentActivity() {
  }
  

NBNavigationView constructor

const NBNavigationView({
  super.key,
  required this.navigationOptions,
  this.onNavigationViewReady,
  this.onProgressChange,
  this.onNavigationCancelling,
  this.onArriveAtWaypoint,
  this.onRerouteFromLocation,
});

Parameters

By utilizing the NavigationLauncherConfig class, you can customize the navigation experience to meet your specific needs, from theme settings to location layer modes and custom styles.

• navigationOptions (required): This parameter provides the necessary configuration for the navigation view.
• onNavigationViewReady: A callback that is triggered when the navigation view is ready.
• onProgressChange: A callback that is triggered when there is a change in the navigation progress.
• onNavigationCancelling: A callback that is triggered when navigation is being canceled.
• onArriveAtWaypoint: A callback that is triggered when arriving at a waypoint.
• onRerouteFromLocation: A callback that is triggered when rerouting from a specific location.

Example Usage

NBNavigationView(
  navigationOptions: NavigationLauncherConfig(
    route: selectedRoute,
    routes: allRoutes,
    themeMode: NavigationThemeMode.system,
  ),
  onNavigationViewReady: (controller) {
    // Handle navigation view ready
  },
  onProgressChange: (progress) {
    // Handle progress change
  },
  onNavigationCancelling: () {
    // Handle navigation canceling
  },
  onArriveAtWaypoint: (waypoint) {
    // Handle arriving at waypoint
  },
  onRerouteFromLocation: (location) {
    // Handle rerouting from location
  },
);

UI Components

You can customize the styles of Navigation View

Android

Add Custom style named CustomNavigationViewLight in your android project styles.xml with parent = "NavigationViewLight"

<style name="CustomNavigationViewLight" parent="NavigationViewLight">
//customize your navigation style
<item name="navViewBannerBackground">@color/color</item>
<item name="navViewBannerPrimaryText">@color/color</item>
...
</style>


<style name="CustomNavigationViewDark" parent="NavigationViewDark">
<item name="navViewBannerBackground">@color/colorAccent</item>

</style>

iOS

Import nb_navigation_flutter in the AppDelegate of your ios project, customize the Navigation View Style by extending DayStyle and NightStyle

import nb_navigation_flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
    override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        GeneratedPluginRegistrant.register(with: self)
        customStyle()
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }
    
     func customStyle() {
        NavStyleManager.customDayStyle = CustomDayStyle()
        NavStyleManager.customNightStyle = CustomNightStyle()
    }
}

import NbmapNavigation

class CustomDayStyle: DayStyle {
    required init() {
        super.init()
    }
    
    override func apply() {
        super.apply()
        ArrivalTimeLabel.appearance().font = UIFont.systemFont(ofSize: 18, weight: .medium).adjustedFont
        ArrivalTimeLabel.appearance().normalTextColor = #color
        BottomBannerContentView.appearance().backgroundColor = #color
    }
}

class CustomNightStyle: NightStyle {
    required init() {
        super.init()
    }
    
    override func apply() {
        super.apply()
        NavigationMapView.appearance().trafficUnknownColor = UIColor.green
    }
}

Running the example code

Please refer to the RUN_EXAMPLE_CODE.md