在我的 Flutter 应用程序中，当我移动地图时，更改后的位置应该显示在底部的容器中，就像这个Image 1一样，它确实显示了，但是当我向上滚动该位置时，它正在闪烁Image 2。
这些是弹出的错误消息
我是 Flutter 的新手，我非常需要这方面的帮助，谢谢。
按照我正在处理的屏幕代码
// @dart=2.9
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:groceryapp/providers/auth_provider.dart';
import 'package:groceryapp/providers/location_provider.dart';
import 'package:groceryapp/screens/homeScreen.dart';
import 'package:groceryapp/screens/landing_screen.dart';
import 'package:groceryapp/screens/login_screen.dart';
import 'package:groceryapp/screens/main_screen.dart';
import 'package:provider/provider.dart';
import 'package:flutter_spinkit/flutter_spinkit.dart';
class MapScreen extends StatefulWidget {
static const String id= 'map-screen';
//const MapScreen({Key? key}) : super(key: key);
@override
_MapScreenState createState() => _MapScreenState();
}
class _MapScreenState extends State<MapScreen> {
LatLng currentLocation = LatLng(37.421632, 122.084664);
GoogleMapController _mapController;
bool _locating = false;
bool _loggedIn=false;
User user;
@override
void initState() {
getCurrentUser();
super.initState();
}
void getCurrentUser() {
User user = FirebaseAuth.instance.currentUser;
if(user!=null){
setState((){
_loggedIn=true;
user= FirebaseAuth.instance.currentUser;
});
}
else{
}
}
@override
Widget build(BuildContext context) {
final locationData = Provider.of<LocationProvider>(context);
final _auth = Provider.of<AuthProvider>(context);
setState((){
currentLocation = LatLng(
locationData.latitude,
locationData.longitude
);
});
void onCreated(GoogleMapController controller){
_mapController = controller;
}
return Scaffold(
body: SafeArea(
child:Column(
children:[
Expanded(
child: Stack(
children : [
GoogleMap(
initialCameraPosition: CameraPosition(
target: currentLocation,
zoom:14.4746,
),
zoomControlsEnabled: false,
minMaxZoomPreference: MinMaxZoomPreference(1.5,20.8),
myLocationEnabled: true,
myLocationButtonEnabled: true,
mapType: MapType.normal,
mapToolbarEnabled: true,
onCameraMove: (CameraPosition position)
{
setState((){
_locating=true;
});
locationData.onCameraMove(position);
},
onMapCreated: onCreated,
onCameraIdle: (){
setState((){
_locating=false;
});
locationData.getMoveCamera();
},
),
Center(
child: Container(
height:50,
margin:EdgeInsets.only(bottom:40),
child: Image.asset(
'images/marker.png',
color: Colors.indigoAccent
),
),
),
Center(
child: SpinKitPulse(
color:Colors.indigoAccent,
size:100.0,
) ,
),
],
),
),
Container(
height:230,
width:MediaQuery.of(context).size.width,
color: Colors.white,
child:Column(
crossAxisAlignment: CrossAxisAlignment.start,
children:[
_locating ? LinearProgressIndicator(
backgroundColor: Colors.transparent,
valueColor: AlwaysStoppedAnimation<Color>(Theme.of(context).primaryColor),
) : Container(),
Padding(
padding: const EdgeInsets.only(
left: 10,
right: 20
),
child: TextButton.icon(
onPressed:(){},
icon: Icon(
Icons.location_searching,
color: Theme.of(context).primaryColor,
),
label: Flexible(
child: Text(
_locating ? 'Locating..'
: locationData.selectedAddress == null?
'Locating..':
locationData.selectedAddress.featureName,
overflow:TextOverflow.ellipsis,
style: TextStyle(
fontWeight:FontWeight.bold,
fontSize: 20,
color: Colors.black,
),
),
),
),
),
Padding(
padding: const EdgeInsets.only(
left: 20,
right: 20
),
child: Text(
_locating ? '': locationData.selectedAddress == null?'':
locationData.selectedAddress.addressLine,
style: TextStyle(
color:Colors.black54,
),
),
),
SizedBox(height:30,),
Padding(
padding: const EdgeInsets.all(15.0),
child: SizedBox(
width: MediaQuery.of(context).size.width-40,
child: AbsorbPointer(
absorbing: _locating ? true : false,
child: TextButton(
style:TextButton.styleFrom(
backgroundColor:_locating ?
Colors.grey: Theme.of(context).primaryColor,
),
onPressed:(){
locationData.savePrefs();
if(_loggedIn==false){
Navigator.pushNamed(context, LoginScreen.id);
}
else{
setState((){
_auth.latitude= locationData.latitude;
_auth.longitude= locationData.longitude;
_auth.address=locationData.selectedAddress.addressLine;
_auth.location=locationData.selectedAddress.featureName;
});
_auth.updateUser(
id: user?.uid,
number: user?.phoneNumber,
);
Navigator.pushNamed(context, MainScreen.id);
}
},
child: Text(
'CONFIRM LOCATION',
style: TextStyle(
color: Colors.white,
),
),
),
),
),
),
],
),
),
],
),
),
);
}
}