**i am facing error while running error is this because of packges or something else i have remove all the old code and add new still facing following error.
Error: 'NavigationBar' is imported from both 'package:flutter/src/material/navigation_bar.dart' and 'package:flutter_onboarding_slider/navigation_bar.dart'. appBar: NavigationBar( ^^^^^^^^^^^^^ : Warning: Operand of null-aware operation '?.' has type 'GoogleMapController' which excludes null. lib/…/map/map.dart:62
'GoogleMapController' is from 'package:google_maps_flutter/google_maps_flutter.dart' ('/D:/flutter/.pub-cache/hosted/pub.dartlang.org/google_maps_flutter-2.1.7/lib/google_maps_flutter.dart'). package:google_maps_flutter/google_maps_flutter.dart:1 _controller?.animateCamera(CameraUpdate.newCameraPosition(CameraPosition( ^
import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:flutter_onboarding_slider/flutter_onboarding_slider.dart'; import 'package:fyppedometer/mainScreens/Navigation/navigationBar.dart'; import 'package:fyppedometer/widgets/constants.dart'; import 'package:fyppedometer/widgets/text.dart';
class MyHome extends StatefulWidget { const MyHome({Key? key}) : super(key: key);
@override State<MyHome> createState() => _MyHomeState();}
class _MyHomeState extends State { final Color kDarkBlueColor = Colors.cyan;
// ignore: non_constant_identifier_names List<String> numbers_Height = [ for (var i = 1.1; i <= 10.0; i = i + 0.1) i.toString() ]; // ignore: non_constant_identifier_names List<String> numbers_Weight = [for (var i = 1; i <= 1000; i++) i.toString()]; int _groupValue = -1; String _selectedGender = 'male'; @override Widget build(BuildContext context) { Size size = MediaQuery.of(context).size; return Container( // color: Colors.amber, child: OnBoardingSlider( buttonText: 'Start', onFinish: () { Navigator.push( context, CupertinoPageRoute( builder: (context) => Navbar(), ), ); }, buttonTextColor: Colors.cyan, // skipTextButton: Text( // 'Skip', // style: TextStyle( // fontSize: 16, // color: kDarkBlueColor, // fontWeight: FontWeight.w600, // ), // ), // trailing: Text( // 'Login', // style: TextStyle( // fontSize: 16, // color: kDarkBlueColor, // fontWeight: FontWeight.w600, // ), // ), // trailingFunction: () { // // Navigator.push( // // context, // // CupertinoPageRoute( // // builder: (context) => LoginPage(), // // ), // // ); // }, controllerColor: kDarkBlueColor, totalPage: 3, headerBackgroundColor: liteblue, pageBackgroundColor: liteblue, background: [ Padding( padding: const EdgeInsets.only(top: 210, left: 80), child: Image.asset( 'assets/gender.png', height: MediaQuery.of(context).size.height * 0.6, width: MediaQuery.of(context).size.width * 0.6, ), ), Padding( padding: const EdgeInsets.only(top: 160, left: 60), child: Image.asset( 'assets/walking.png', height: MediaQuery.of(context).size.height * 0.7, width: MediaQuery.of(context).size.width * 0.7, ), ), Padding( padding: const EdgeInsets.only(top: 200, left: 60), child: Image.asset( 'assets/human.png', height: MediaQuery.of(context).size.height * 0.6, width: MediaQuery.of(context).size.width * 0.6, ), ), ], speed: 1.8, pageBodies: [ Container( // padding: EdgeInsets.symmetric(horizontal: 40), child: Column( mainAxisAlignment: MainAxisAlignment.start, crossAxisAlignment: CrossAxisAlignment.center, children: <Widget>[ const Text( 'What’s Your Gender', textAlign: TextAlign.center, style: TextStyle( color: Colors.white, fontSize: 24.0, fontWeight: FontWeight.w600, ), ), const SizedBox( height: 10, ), const Text( 'Calories & Stride length calculation need it ', textAlign: TextAlign.center, style: TextStyle( color: Colors.white60, fontSize: 21.0, fontWeight: FontWeight.w600, ), ), const SizedBox( height: 20, ), Column( crossAxisAlignment: CrossAxisAlignment.start, children: [ Container( height: size.height * 0.1, width: size.width * 0.5, decoration: BoxDecoration( borderRadius: BorderRadius.circular(25), // radius of 10 color: Color.fromARGB(255, 19, 65, 103), ), child: Center( child: ListTile( leading: Radio<String>( activeColor: Colors.white, value: 'male', groupValue: _selectedGender, onChanged: (value) { setState(() { _selectedGender = value!; }); }, ), title: text( textData: "Male", color: Colors.white, fontsize: 20.0, fontweight: FontWeight.bold), // Text(_selectedGender == 'male' ? 'Hello gentlement!' : 'Hi lady!') ), ), ), SizedBox(height: 20), Container( height: size.height * 0.1, width: size.width * 0.5, decoration: BoxDecoration( borderRadius: BorderRadius.circular(25), // radius of 10 color: Color.fromARGB(255, 19, 65, 103), ), child: Center( child: ListTile( leading: Radio<String>( activeColor: Colors.white, value: 'female', groupValue: _selectedGender, onChanged: (value) { setState(() { _selectedGender = value!; }); }, ), title: text( textData: "Female", color: Colors.white, fontsize: 20.0, fontweight: FontWeight.bold), // Text(_selectedGender == 'male' ? 'Hello gentlement!' : 'Hi lady!') ), ), ), ], ) ]), ), Container( // padding: EdgeInsets.symmetric(horizontal: 40), child: Column( mainAxisAlignment: MainAxisAlignment.start, crossAxisAlignment: CrossAxisAlignment.center, children: <Widget>[ const Text( 'How Tall are you?', textAlign: TextAlign.center, style: TextStyle( color: Colors.white, fontSize: 28.0, fontWeight: FontWeight.w600, ), ), const SizedBox( height: 10, ), const Text( 'To Personalize Your Fitness Goal ', textAlign: TextAlign.center, style: TextStyle( color: Colors.white60, fontSize: 20.0, fontWeight: FontWeight.w600, ), ), const SizedBox( height: 20, ), Column( crossAxisAlignment: CrossAxisAlignment.start, children: [ Center( child: Container( height: size.height * 0.10, width: size.width * 0.5, decoration: BoxDecoration( borderRadius: BorderRadius.circular(15), border: Border.all( color: Color.fromARGB(255, 145, 174, 225))), child: Center( child: text( textData: "Height", fontsize: 30.0, fontweight: FontWeight.bold, color: Color.fromARGB(255, 147, 148, 152)), ), ), ), SizedBox( height: 30, ), Center( child: Container( height: size.height * 0.13, width: size.width * 0.5, decoration: BoxDecoration( borderRadius: BorderRadius.circular(20), border: Border.all( color: Color.fromARGB(255, 92, 89, 89)), // color: Colors.white, ), child: ListWheelScrollView.useDelegate( itemExtent: 100, // controller: fixedExtentScrollController, physics: FixedExtentScrollPhysics(), onSelectedItemChanged: (i) { print(numbers_Height[i]); }, childDelegate: ListWheelChildLoopingListDelegate( children: <Widget>[ ...numbers_Height.map((String number) { return Center( child: Text( number, style: const TextStyle( fontSize: 28.0, color: Colors.white, fontWeight: FontWeight.bold, fontStyle: FontStyle.normal, decoration: TextDecoration.none), ), ); }) ], ), ), ), ) ], ) ]), ), Container( // padding: EdgeInsets.symmetric(horizontal: 40), child: Column( mainAxisAlignment: MainAxisAlignment.start, crossAxisAlignment: CrossAxisAlignment.center, children: <Widget>[ const Text( 'How much do you Weight?', textAlign: TextAlign.center, style: TextStyle( color: Colors.white, fontSize: 28.0, fontWeight: FontWeight.w600, ), ), const SizedBox( height: 10, ), const Text( 'To Personalize Your Fitness Goal ', textAlign: TextAlign.center, style: TextStyle( color: Colors.white60, fontSize: 20.0, fontWeight: FontWeight.w600, ), ), const SizedBox( height: 20, ), Column( crossAxisAlignment: CrossAxisAlignment.start, children: [ Center( child: Container( height: size.height * 0.10, width: size.width * 0.5, decoration: BoxDecoration( borderRadius: BorderRadius.circular(15), border: Border.all( color: Color.fromARGB(255, 145, 174, 225))), child: Center( child: text( textData: "Weight", fontsize: 30.0, fontweight: FontWeight.bold, color: Color.fromARGB(255, 147, 148, 152)), ), ), ), SizedBox( height: 30, ), Center( child: Container( height: size.height * 0.13, width: size.width * 0.5, decoration: BoxDecoration( borderRadius: BorderRadius.circular(20), border: Border.all( color: Color.fromARGB(255, 92, 89, 89)), ), child: ListWheelScrollView.useDelegate( itemExtent: 100, physics: FixedExtentScrollPhysics(), onSelectedItemChanged: (i) { print(numbers_Weight[i]); }, childDelegate: ListWheelChildLoopingListDelegate( children: <Widget>[ ...numbers_Weight.map((String number) { return Center( child: Text( number, //Here is the child value I would like to get style: const TextStyle( fontSize: 28.0, color: Colors.white, fontWeight: FontWeight.bold, fontStyle: FontStyle.normal, decoration: TextDecoration.none), ), ); }) ], ), ), ), ) ], ) ]), ), ], ), ); }}