Android Studio – Unhandled Exception: type 'int' is not a subtype of type 'String' Error in flutter

Im really new to the flutter and stuck at this point im designing the uber clone but not able to get the searched place details and also the polyline is not coming only the progress bar its get stuck over there only loading loading…..

E/flutter (20208): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: type 'int' is not a subtype of type 'String'
E/flutter (20208): #0      HelperMethods.getDirectionDetails (package:cab_rider/helpers/helpermethods.dart:85:22)
E/flutter (20208): <asynchronous suspension>
E/flutter (20208): #1      _MainPageState.getDirection (package:cab_rider/mainpage.dart:349:23)
E/flutter (20208): <asynchronous suspension>
E/flutter (20208): #2      _MainPageState.build.<anonymous closure> (package:cab_rider/mainpage.dart:243:29)
E/flutter (20208): <asynchronous suspension>
E/flutter (20208):

This is my HelperMethods.dart file code :

import 'package:cab_rider/datamodels/address.dart';
import 'package:cab_rider/datamodels/directiondetails.dart';
import 'package:cab_rider/dataprovider/appdata.dart';
import 'package:cab_rider/globalvariable.dart';
import 'package:cab_rider/helpers/requesthelper.dart';
import 'package:connectivity/connectivity.dart';
import 'package:flutter/cupertino.dart';
import 'package:geolocator/geolocator.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:provider/provider.dart';

class HelperMethods{


  static Future<String> findCordinateAddress(Position position, context) async {
    String placeAddress = '';
    String st1, st2, st3, st4;

    var connectivityResult = await Connectivity().checkConnectivity();
    if (connectivityResult != ConnectivityResult.mobile && connectivityResult != ConnectivityResult.wifi) {
      return placeAddress;
    }

    String url = 'https://maps.googleapis.com/maps/api/geocode/json?latlng= ${position.latitude}, ${position.longitude}&key=$mapKey';

    var response = await RequestHelper.getRequest(url);

    if(response != 'failed'){
      placeAddress = response['results'][0]['formatted_address'];


      var placeId;
      var longitude;
      var latitude;
      var placeFormattedAddress;
      var placeName;

      st1 = placeAddress = response["results"][0]["address_components"][0]["long_name"];
      st2 = placeAddress = response["results"][0]["address_components"][1]["long_name"];
      st3 = placeAddress = response["results"][0]["address_components"][2]["long_name"];
      st4 = placeAddress = response["results"][0]["address_components"][3]["long_name"];
      placeAddress = st1 + ", " + st2 + ", " + st3 + ", " + st4;

      Address pickupAddress = new Address(placeId: placeId , longitude: longitude, latitude: latitude, placeFormattedAddress: placeFormattedAddress, placeName: placeName);
      pickupAddress.longitude = position.longitude;
      pickupAddress.latitude = position.latitude;
      pickupAddress.placeName = placeAddress;


      Provider.of<AppData>(context, listen: false).updatePickupAddress(pickupAddress);



    }

    return placeAddress;
  }

  static Future<DirectionDetails?> getDirectionDetails(LatLng startPosition, LatLng endPosition) async {

    String url = 'https://maps.googleapis.com/maps/api/directions/json?origin=${startPosition.latitude},${startPosition.longitude}&destination=${endPosition.latitude},${endPosition.longitude}&mode=driving&key=$mapKey';

    var response = await RequestHelper.getRequest(url);                  //errorline 

    if(response == 'failed'){
      return null;
    }

    var durationText;
    var durationValue;
    var distanceText;
    var distanceValue;
    var encodedPoints;


    DirectionDetails directionDetails = DirectionDetails(distanceText: distanceText, distanceValue: distanceValue, durationText: durationText, durationValue: durationValue, encodedPoints: encodedPoints);


    directionDetails.durationText = response['routes'][0]['legs'][0]['duration']['text'];
    directionDetails.durationValue = response['routes'][0]['legs'][0]['duration']['value'];         //error line

    directionDetails.distanceText = response['routes'][0]['legs'][0]['distance']['text'];
    directionDetails.distanceValue = response['routes'][0]['legs'][0]['distance']['value'];

    directionDetails.encodedPoints = response['routes'][0]['overview_polyline']['points'] ;

    return directionDetails;
  }
}

This is my MainPage.dart file code: –

import 'package:cab_rider/brand_colors.dart';
import 'package:cab_rider/dataprovider/appdata.dart';
import 'package:cab_rider/helpers/helpermethods.dart';
import 'package:cab_rider/searchpage.dart';
import 'package:cab_rider/styles/styles.dart';
import 'package:cab_rider/widgets/BrandDivider.dart';
import 'package:cab_rider/widgets/ProgressDialog.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:geolocator/geolocator.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'dart:async';
import 'package:outline_material_icons/outline_material_icons.dart';
import 'dart:io';
import 'package:provider/provider.dart';

class MainPage extends StatefulWidget {
  static const String id ='mainpage';


  @override
  _MainPageState createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {

  GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>();
  double searchSheetHeight = (Platform.isIOS) ? 300 : 275 ;


  Completer<GoogleMapController> _controller = Completer();
  late GoogleMapController mapController;
  double mapBottomPadding = 0;

  var geoLocator = Geolocator();
   Position? currentPosition;

    void setupPositionLocator() async {
    Position position = await Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.bestForNavigation);
    currentPosition = position;


    LatLng pos = LatLng(position.latitude, position.longitude);
    CameraPosition cp = new CameraPosition(target: pos, zoom: 14);
    mapController.animateCamera(CameraUpdate.newCameraPosition(cp));

    String address = await HelperMethods.findCordinateAddress(position, context);
    print(address);


  }

  static final CameraPosition _kGooglePlex = CameraPosition(
      target: LatLng(37.42796133580664, -122.085749655962),
      zoom: 14.4746,
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: scaffoldKey,
      drawer: Container(
        width: 250,
        color: Colors.white,
        child: Drawer(

          child: ListView(
            padding: EdgeInsets.all(0),
            children: <Widget>[
              
              Container(
                color: Colors.white,
                height: 160,
                child: DrawerHeader(
                  decoration: BoxDecoration(
                    color: Colors.white,
                  ),
                  child: Row(
                    children: <Widget>[
                      Image.asset('images/user_icon.png', height: 60, width: 60,),
                      SizedBox(width: 15,),

                      Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[
                          Text('Shubham',style: TextStyle(fontSize: 20, fontFamily: 'Brand-Bold'),),
                          SizedBox(height: 5,),
                          Text('View Profile'),

                        ],
                      )
                    ],
                  ),

                ),
              ),
              BrandDivider(),

              SizedBox(height: 10,),

              ListTile(
                leading: Icon(OMIcons.cardGiftcard),
                title: Text('Free Rides', style: kDrawerItemStyle,),
              ),

              ListTile(
                leading: Icon(OMIcons.creditCard),
                title: Text('Payments', style: kDrawerItemStyle,),
              ),

              ListTile(
                leading: Icon(OMIcons.history),
                title: Text('Ride History', style: kDrawerItemStyle,),
              ),

              ListTile(
                leading: Icon(OMIcons.contactSupport),
                title: Text('Support', style: kDrawerItemStyle,),
              ),

              ListTile(
                leading: Icon(OMIcons.info),
                title: Text('About', style: kDrawerItemStyle,),
              )

            ],
          ),

        ),
      ),

        body:Stack(
          children: <Widget>[
            GoogleMap(
              padding: EdgeInsets.only(bottom: mapBottomPadding),
              mapType: MapType.normal,
              myLocationButtonEnabled: true,
              initialCameraPosition: _kGooglePlex,
              myLocationEnabled: true,
              zoomGesturesEnabled: true,
              zoomControlsEnabled: true,

              onMapCreated: (GoogleMapController controller){
                _controller.complete(controller);
                mapController = controller;


                setState(() {

                  mapBottomPadding  = (Platform.isAndroid) ? 280 : 270 ;
                });

                setupPositionLocator();

              },


            ),

            /// MenuButton
            Positioned(
              top: 44,
              left: 20,
              child: GestureDetector(
                onTap: (){
                  scaffoldKey.currentState!.openDrawer();
                },
                child: Container(
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(20),
                    boxShadow: [
                      BoxShadow(
                       color: Colors.black26,
                        blurRadius: 5.0,
                        spreadRadius: 0.5,
                        offset: Offset(
                          0.7,
                          0.7,
                        ),

                      )
                    ]
                  ),
                  child: CircleAvatar(
                    backgroundColor: Colors.white,
                    radius: 20,
                    child: Icon(Icons.menu, color: Colors.black87,),
                  ),

                ),
              ),
            ),


            /// SearchSheet
            Positioned(
              left: 0,
              right: 0,
              bottom: 0,
              child: Container(
                height: searchSheetHeight,
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.only(topLeft: Radius.circular(15), topRight: Radius.circular(15)),
                  boxShadow: [
                    BoxShadow(
                      color: Colors.black26,
                      blurRadius: 15.0,
                      spreadRadius: 0.5,
                      offset: Offset(
                        0.7,
                        0.7,
                      )

                    )
                  ]


                ),
                child: Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 18),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      SizedBox(height: 5,),
                      Text('Nice to see you!', style: TextStyle(fontSize: 10),),
                      Text('Where are you going?', style: TextStyle(fontSize: 18, fontFamily: 'Brand-Bold'),),

                      SizedBox(height: 20,),

                      GestureDetector(
                        onTap: () async {

                          var response = await Navigator.push(context, MaterialPageRoute(
                              builder: (context) => SearchPage()
                          ));

                          if(response == 'getDirection'){

                            await getDirection();                                      // error line
                          }

                        },
                        child: Container(
                          decoration: BoxDecoration(
                            color: Colors.white,
                            borderRadius: BorderRadius.circular(4),
                            boxShadow: [
                              BoxShadow(
                                color: Colors.black26,
                                blurRadius: 5.0,
                                spreadRadius: 0.5,
                                offset: Offset(
                                  0.7,
                                  0.7,
                                )
                              )
                            ]
                          ),
                          child: Padding(
                            padding: const EdgeInsets.all(12.0),
                            child: Row(
                              children: <Widget>[
                                Icon(Icons.search, color: Colors.blueAccent,),
                                SizedBox(width: 10,),
                                Text('Search Destination'),
                              ],
                            ),
                          ),
                        ),
                      ),

                      SizedBox(height: 22,),

                      Row(
                        children: <Widget>[
                          Icon(OMIcons.home, color: BrandColors.colorDimText,),
                          SizedBox(width: 12,),
                          Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: <Widget>[
                              Text('Add Home'),
                              SizedBox(height: 3,),
                              Text('Your residental address ',
                              style: TextStyle(fontSize: 11, color: BrandColors.colorDimText,),

                              ),
                            ]
                          )

                        ],
                      ),

                      SizedBox(height: 10,),

                      BrandDivider(),

                      SizedBox(height: 16,),

                      Row(
                        children: <Widget>[
                          Icon(OMIcons.workOutline, color: BrandColors.colorDimText,),
                          SizedBox(width: 12,),
                          Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              children: <Widget>[
                                Text('Add Work'),
                                SizedBox(height: 3,),
                                Text('Your Office address ',
                                  style: TextStyle(fontSize: 11, color: BrandColors.colorDimText,),

                                ),
                              ]
                          )

                        ],
                      ),



                    ],
                  ),
                ),
              ),
            )
          ],
        )
      );


  }

   Future<void> getDirection() async {

    var pickup = Provider.of<AppData>(context, listen: false).pickupAddress;
    var destination = Provider.of<AppData>(context, listen: false).destinationAddress;

    var pickLatLng = LatLng(pickup!.latitude, pickup.longitude);
    var destinationLatLng = LatLng(destination!.latitude, destination.longitude);

    showDialog(
        barrierDismissible: false,
        context: context,
        builder: (BuildContext context) => ProgressDialog(status: 'Please wait',)
    );

    var thisDetails = await HelperMethods.getDirectionDetails(pickLatLng, destinationLatLng);

    Navigator.pop(context);

    print(thisDetails!.encodedPoints);


  }
}

This is my RequestHelper.dart file :

import 'dart:convert';
import 'package:http/http.dart' as http;


class RequestHelper{

 static Future<dynamic> getRequest(String url) async {


   http.Response response = await http.get(Uri.parse(url));

   try {
     if (response.statusCode == 200) {
       String data = response.body;
       var decodedData = jsonDecode(data);
       return decodedData;
     } else {
       return 'failed';
     }
   } catch (e) {
     return 'failed';
   }

 }
}

#1 error points out at this line

directionDetails.durationText = response['routes'][0]['legs'][0]['duration']['text'];
    directionDetails.durationValue = response['routes'][0]['legs'][0]['duration']['value'];         //error line

    directionDetails.distanceText = response['routes'][0]['legs'][0]['distance']['text'];
    directionDetails.distanceValue = response['routes'][0]['legs'][0]['distance']['value'];

    directionDetails.encodedPoints = response['routes'][0]['overview_polyline']['points'] ;

#2 error points out this line

var response = await RequestHelper.getRequest(url);      

#3 error points out this line

await getDirection();

Please help me to solve this error its my final year project…