flutter_polyline_points 0.1.0

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flutter_polyline_points #

A flutter plugin that decodes encoded google polyline string into list of geo-coordinates suitable for showing route/polyline on maps

Getting Started #

This package contains functions to decode google encoded polyline string which returns a list of co-ordinates indicating route between two geographical position

Usage #

To use this package, add flutter_polyline_points as a dependency in your pubspec.yaml file.

Import the package #

import 'package:flutter_polyline_points/flutter_polyline_points.dart';

First method #

Get the list of points by Geo-coordinate

PolylinePoints polylinePoints = PolylinePoints();
List<PointLatLng> result = await polylinePoints.getRouteBetweenCoordinates(googleAPiKey,
        _originLatitude, _originLongitude, _destLatitude, _destLongitude);

Second method #

Decode an encoded google polyline string e.g _p~iF~ps|U_ulLnnqC_mqNvxq`@

List<PointLatLng> result = decodePolyline("_p~iF~ps|U_ulLnnqC_mqNvxq`@");

See the example directory for a complete sample app

[0.1] - 25-04-2019.

update readme.

[0.0.1] - 25-04-2019.

initial release.


import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:flutter_polyline_points/flutter_polyline_points.dart';

class MapScreen extends StatefulWidget {

  _MapScreenState createState() => _MapScreenState();

class _MapScreenState extends State<MapScreen> {

  GoogleMapController mapController;
  double _originLatitude = 6.5212402, _originLongitude = 3.3679965;
  double _destLatitude = 6.849660, _destLongitude = 3.648190;
  Map<MarkerId, Marker> markers = {};
  Map<PolylineId, Polyline> polylines = {};
  List<LatLng> polylineCoordinates = [];
  PolylinePoints polylinePoints = PolylinePoints();
  String googleAPiKey = "Your api key";

  void initState() {
    /// origin marker
    _addMarker(LatLng(_originLatitude, _originLongitude), "origin", BitmapDescriptor.defaultMarker);
    /// destination marker
    _addMarker(LatLng(_destLatitude, _destLongitude), "destination", BitmapDescriptor.defaultMarkerWithHue(90));

  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
          body: GoogleMap(
            initialCameraPosition: CameraPosition(
                target: LatLng(_originLatitude, _originLongitude),
                zoom: 15
            myLocationEnabled: true,
            tiltGesturesEnabled: true,
            compassEnabled: true,
            scrollGesturesEnabled: true,
            zoomGesturesEnabled: true,
            onMapCreated: _onMapCreated,
            markers: Set<Marker>.of(markers.values),
            polylines: Set<Polyline>.of(polylines.values),

  void _onMapCreated(GoogleMapController controller) async
    mapController = controller;

  _addMarker(LatLng position, String id, BitmapDescriptor descriptor)
    MarkerId markerId = MarkerId(id);
    Marker marker = Marker(markerId: markerId, icon: descriptor, position: position);
    markers[markerId] = marker;

    PolylineId id = PolylineId("poly");
    Polyline polyline = Polyline(
        polylineId: id,
        color: Colors.red, points: polylineCoordinates
    polylines[id] = polyline;
    setState(() {

    List<PointLatLng> result = await polylinePoints.getRouteBetweenCoordinates(googleAPiKey,
        _originLatitude, _originLongitude, _destLatitude, _destLongitude);
      result.forEach((PointLatLng point){
        polylineCoordinates.add(LatLng(point.latitude, point.longitude));


Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  flutter_polyline_points: ^0.1.0

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:flutter_polyline_points/flutter_polyline_points.dart';
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Learn more about scoring.

We analyzed this package on Oct 16, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.5.1
  • pana: 0.12.21
  • Flutter: 1.9.1+hotfix.4


Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Health suggestions

Format lib/src/PointLatLng.dart.

Run flutter format to format lib/src/PointLatLng.dart.

Format lib/src/network_util.dart.

Run flutter format to format lib/src/network_util.dart.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
http ^0.12.0+2 0.12.0+2
Transitive dependencies
async 2.4.0
charcode 1.1.2
collection 1.14.11 1.14.12
http_parser 3.1.3
meta 1.1.7
path 1.6.4
pedantic 1.8.0+1
sky_engine 0.0.99
source_span 1.5.5
string_scanner 1.0.5
term_glyph 1.1.0
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies