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Nextbillion Maps Flutter

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Introduction

Prerequisites

Installation

Dependency

Add the following dependency to your project pubspec.yaml file to use the NB Maps Flutter Plugin add the dependency to the pubspec.yaml:

dependencies:
  nb_maps_flutter: version

Import

Import the maps plugin in your code

import 'package:nb_maps_flutter/nb_maps_flutter.dart';

Initialization

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

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

NBMap Widget

Create a NBMap Widget with initial camera position

NBMap(
      onMapCreated: onMapCreated,
      initialCameraPosition: const CameraPosition(
           target: LatLng(0.0, 0.0),
           zoom: 11.0,
  ),
)

Location Component

Configuration permissions

You need to grant location permission in order to use the location component of the NB Maps 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" />

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>

Enable Location Tracking

Observe User Location Updating

NBMap(
     onMapCreated: _onMapCreated,
     initialCameraPosition: const CameraPosition(
            target: LatLng(0, 0),
            zoom: 14.0,
          ),
     trackCameraPosition: true,
     myLocationEnabled: true,
     myLocationTrackingMode: MyLocationTrackingMode.Tracking,
     onUserLocationUpdated: (userLocation) {},
)

Annotations

To operate the mapview, you need to get the map controller in the onMapReady(NextbillionMapController controller) callback.

Symbol Annotation

The Symbol annotation adds a symbol to the map. It is configured by the specified custom SymbolOptions. If you need to add an image symbol, you need to add the image source to the map style.

Add image source

final ByteData bytes = await rootBundle.load("assets/image.png");
final Uint8List list = bytes.buffer.asUint8List();
await controller?.addImage("ic_marker", list);

var symbol = controller.addSymbol(
      SymbolOptions(
          geometry: LatLng(-33.894372606072309, 151.17576679759523),
          iconImage: "ic_marker",
          iconSize: 2),
    );

//remove annotation
controller!.removeSymbol(symbol);

//update annotation
controller!.updateSymbol(symbol, updatedOptions)

Line Annotation

The Line annotation adds a line to the map. It is configured by the specified custom LineOptions.

var line = controller.addLine(
      LineOptions(
        geometry: [
          LatLng(-33.874867744475786, 151.170627211986584),
          LatLng(-33.881979408447314, 151.171361438502117),
          LatLng(-33.887058805548882, 151.175032571079726),
        ],
        lineColor: "#0000FF",
        lineWidth: 20,
      ),
    );

//remove annotation
controller!.removeLine(line);

//update annotation
controller!.updateLine(line, updatedOptions)

Fill Annotation

The Fill annotation adds a fill to the map. It is configured using the specified custom FillOptions.

var fill = controller!.addFill(
      FillOptions(
        geometry: [
          [
            LatLng(-33.901517742631846, 151.178099204457737),
            LatLng(-33.872845324482071, 151.179025547977773),
            LatLng(-33.868230472039514, 151.147000529140399),
            LatLng(-33.883172899638311, 151.150838238009328),
            LatLng(-33.901517742631846, 151.178099204457737),
          ],
        ],
        fillColor: "#FF0000",
        fillOutlineColor: "#000000",
      ),
    )

//remove annotation
controller!.removeFill(fill);

//update annotation
controller!.updateFill(fill, updatedOptions)

Circle Annotation

The Circle annotation adds a circle to the map. It is configured using the specified custom CircleOptions.

var addCircle = controller!.addCircle(
      CircleOptions(
        geometry: LatLng(-33.894372606072309, 151.17576679759523),
        circleStrokeColor: "#00FF00",
        circleStrokeWidth: 2,
        circleRadius: 30,
      ),
    );

Annotation onTap Callbacks

The following code snippet shows how to add Callbacks to receive tap events, and how to place annotations on this map, and how to remove these callbacks in dispose() function.

void _onMapCreated(NextbillionMapController controller) {
    this.controller = controller;
    controller.onFillTapped.add(_onFillTapped);
    controller.onCircleTapped.add(_onCircleTapped);
    controller.onLineTapped.add(_onLineTapped);
    controller.onSymbolTapped.add(_onSymbolTapped);
  }

 @override
  void dispose() {
    controller.onFillTapped.remove(_onFillTapped);
    controller.onCircleTapped.remove(_onCircleTapped);
    controller.onLineTapped.remove(_onLineTapped);
    controller.onSymbolTapped.remove(_onSymbolTapped);
    super.dispose();
  }

Camera

Defines a camera move, and supports absolute moves as well as moving relatively to a specified position.

CameraUpdate

A Camera update moves the camera to the specified CameraPosition with the camera’s [target] geographical location, its [zoom] level, [tilt] angle, and [bearing].

CameraUpdate.newCameraPosition(
       const CameraPosition(
              bearing: 270.0,
              target: LatLng(51.5160895, -0.1294527),
              tilt: 30.0,
              zoom: 17.0,
        ),
 )
controller.animateCamera(cameraUpdate)

The following code snippet shows how to move the camera target to a specified geographical location.

CameraUpdate.newLatLng(const LatLng(56.1725505, 10.1850512))

Move Camera

The animateCamera() function starts an animated change of the map camera position

controller.animateCamera(cameraUpdate, duration)

The moveCamera function will move the camera quickly, which can be visually jarring for a user. In real usage we should strongly consider using the animateCamera() method instead of moveCamera() because it’s less abrupt.

controller.moveCamera(cameraUpdate)

More

Download source code on GitHub

https://github.com/nextbillion-ai/nb-maps-flutter
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