我正在尝试通过路线从一个屏幕导航到另一个屏幕。当我点击页面上的按钮以移动到提供的路线时，我得到了错误：
I/flutter ( 8790): Another exception was thrown: There are multiple heroes that share the same tag within a subtree.
与您共享源代码：
import 'dart:convert';
import 'dart:io';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter_counter/flutter_counter.dart';
import 'package:gender_selection/gender_selection.dart';
import 'package:group_chats/addContactUI.dart';
import 'package:group_chats/addPhone.dart';
import 'package:group_chats/letGoUI.dart';
import 'package:http/http.dart' as http;
import 'package:image_picker/image_picker.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'Animation/FadeAnimation.dart';
import 'Model/insertUserModel.dart';
class AddProfileUI extends StatefulWidget {
final List<String> listFriends;
final String phone;
AddProfileUI(this.listFriends, this.phone);
@override
_AddProfileUIState createState() => _AddProfileUIState();
}
class _AddProfileUIState extends State<AddProfileUI> {
File _image;
final picker = ImagePicker();
final _formKey = GlobalKey<FormState>();
String name = "";
String city = "";
TextEditingController dobController = TextEditingController();
bool single = false;
Gender gender;
final _scaffoldKey = GlobalKey<ScaffoldState>();
int defaultValue = 18;
List<String> selectedContact;
SharedPreferences prefs;
bool _loading = true;
Future initPrefs() async {
prefs = await SharedPreferences.getInstance();
}
uploadImage(String userId) async {
try {
FormData formData = new FormData.fromMap({
"file":
await MultipartFile.fromFile(_image.path, filename: "$userId.jpg"),
});
var response = await Dio().post(
"https://us-central1-app-backend-fc090.cloudfunctions.net/webApi/api/v1/upload_profile/$userId",
data: formData);
if (response.statusCode == 200)
return response.data;
else
return null;
} catch (e) {
print(e.toString());
return null;
}
}
Future<InsertUserModel> insertData() async {
try {
for (int i = 0; i < selectedContact.length; i++) {
if (selectedContact[i][0] == "0") {
selectedContact[i] = selectedContact[i].replaceRange(0, 1, "+972");
}
}
var body = jsonEncode({
"gender": gender.index == 0 ? "male" : "female",
"city": city,
"last_login": {},
"friends": selectedContact ?? [],
"single": single,
"name": name,
"phone_number": widget.phone,
"age": defaultValue
});
final String apiUrl =
"https://us-central1-app-backend-fc090.cloudfunctions.net/webApi/api/v1/users/${AddPhoneUI.uid}";
final response = await http.post(apiUrl,
headers: {"content-type": "application/json"}, body: body);
if (response.statusCode == 200) {
final responseString = response.body;
return insertUserModelFromJson(responseString);
}
} catch (e) {
setState(() {
_loading = false;
});
}
}
getUserData() async {
try {
final String apiUrl =
"https://us-central1-app-backend-fc090.cloudfunctions.net/webApi/api/v1/users/";
final response = await http.get(apiUrl);
if (response.statusCode == 200) {
final responseString = response.body;
return insertUserModelFromJson(responseString);
}
} catch (e) {
setState(() {
_loading = false;
});
Scaffold.of(context).showSnackBar(SnackBar(
backgroundColor: Colors.red,
content: Text('Error: ${e.toString()}'),
duration: Duration(milliseconds: 2500),
));
}
}
Future<void> _selectStartingDate(BuildContext context) async {
DateTime selectedDate = DateTime.now();
final DateTime picked = await showDatePicker(
context: context,
initialDate: selectedDate,
firstDate: DateTime(1950),
lastDate: DateTime(
DateTime.now().year, DateTime.now().month, DateTime.now().day),
);
if (picked != null && picked != selectedDate)
setState(() {
selectedDate = picked;
dobController.text = selectedDate.year.toString() +
"-" +
selectedDate.month.toString() +
"-" +
selectedDate.day.toString();
});
}
Future getImage() async {
final pickedFile = await picker.getImage(source: ImageSource.gallery);
setState(() {
_image = File(pickedFile.path);
});
}
showPopUp(BuildContext context) {
showDialog(
context: context,
builder: (context) => AlertDialog(
shape:
OutlineInputBorder(borderRadius: BorderRadius.circular(14.0)),
content: Container(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
SizedBox(
height: 20.0,
),
Text(
"My Profile",
style: TextStyle(
fontSize: 27.0, fontWeight: FontWeight.w600),
),
SizedBox(
height: 30.0,
),
RichText(
text: TextSpan(
text: "Your friends will be able to\nsee ",
style: TextStyle(
color: Colors.black,
fontSize: 18.0,
),
children: <TextSpan>[
TextSpan(
text: 'only',
style: TextStyle(
color: Colors.blue,
fontWeight: FontWeight.w500)),
TextSpan(text: 'your picture and\name.'),
],
)),
SizedBox(
height: 10.0,
),
RichText(
text: TextSpan(
text: "Other fields are used for\n",
style: TextStyle(
color: Colors.black,
fontSize: 18.0,
),
children: <TextSpan>[
TextSpan(
text: 'research issues',
style: TextStyle(
color: Colors.blue,
fontWeight: FontWeight.w500)),
TextSpan(text: "only."),
],
)),
SizedBox(
height: 10.0,
),
RichText(
text: TextSpan(
text: "Please fill all the fields.",
style: TextStyle(
color: Colors.black,
fontSize: 18.0,
),
)),
SizedBox(
height: 80.0,
),
MaterialButton(
shape: OutlineInputBorder(
borderSide: BorderSide(width: 1.0)),
color: Colors.white38,
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 10.0, horizontal: 20.0),
child: Text(
"Ok, got it",
style: TextStyle(fontSize: 18.0),
),
),
onPressed: () {
Navigator.pop(context);
},
),
],
),
),
));
}
@override
void initState() {
super.initState();
selectedContact = widget.listFriends;
initPrefs();
}
@override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey,
body: SafeArea(
child: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Padding(
padding: const EdgeInsets.only(right: 10.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () {},
),
GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => AddContactUI(),
)).then((value) {
setState(() {
selectedContact = value;
});
});
},
child: Column(
children: [
Icon(
Icons.supervisor_account,
size: 40.0,
),
Text("Add Friends"),
],
),
)
],
),
),
Container(
child: GestureDetector(
onTap: () async {
await getImage();
},
child: CircleAvatar(
radius: 60.0,
backgroundImage: _image != null
? Image.file(_image).image
: Image.asset("assets/empty.png").image,
backgroundColor: Colors.transparent,
),
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: FadeAnimation(
1.7,
Form(
key: _formKey,
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Colors.white,
boxShadow: [
BoxShadow(
color: Color(0xff5E17EB).withOpacity(0.3),
blurRadius: 20,
offset: Offset(0, 10),
)
]),
child: Column(
children: <Widget>[
Container(
padding: EdgeInsets.all(10),
decoration: BoxDecoration(
border: Border(
bottom:
BorderSide(color: Colors.grey[200]))),
child: TextFormField(
textInputAction: TextInputAction.next,
onFieldSubmitted: (_) =>
FocusScope.of(context).nextFocus(),
onChanged: (val) {
setState(() {
name = val;
});
},
validator: (val) =>
val.isEmpty ? "Enter Name" : null,
decoration: InputDecoration(
border: InputBorder.none,
hintText: "Name",
hintStyle: TextStyle(color: Colors.grey)),
),
),
Container(
decoration: BoxDecoration(
border: Border(
bottom:
BorderSide(color: Colors.grey[200]))),
padding: EdgeInsets.all(10),
child: TextFormField(
textInputAction: TextInputAction.next,
keyboardType: TextInputType.text,
onChanged: (val) {
setState(() {
city = val;
});
},
validator: (val) {
if (val.isEmpty) return "Enter City";
// if (val.length < 6)
// return "Password should be at least 6 characters";
return null;
},
decoration: InputDecoration(
border: InputBorder.none,
hintText: "City",
hintStyle: TextStyle(color: Colors.grey)),
),
),
Container(
height: 140.0,
padding: EdgeInsets.all(10),
child: GenderSelection(
selectedGender: gender,
maleText: "", //default Male
femaleText: "", //default Female
linearGradient: LinearGradient(colors: [
Colors.indigo,
Colors.black
]), //List: [Colors.indigo, Colors.black]
selectedGenderIconBackgroundColor:
Colors.indigo, // default red
checkIconAlignment:
Alignment.centerRight, // default bottomRight
selectedGenderCheckIcon:
null, // default Icons.check
onChanged: (Gender gender) {
this.gender = gender;
print(this.gender);
},
equallyAligned: true,
animationDuration: Duration(milliseconds: 400),
isCircular: true, // default : true,
isSelectedGenderIconCircular: true,
opacityOfGradient: 0.6,
padding: const EdgeInsets.all(3),
size: 120, //default : 120
),
),
SizedBox(
height: 10.0,
),
Row(
children: [
Checkbox(
value: single,
onChanged: (value) {
setState(() {
single = !single;
});
},
),
Text(
"Are you Single?",
style: TextStyle(fontSize: 16.0),
)
],
),
Padding(
padding: const EdgeInsets.all(14.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text(
"Age:",
style: TextStyle(fontSize: 18.0),
),
Counter(
initialValue: defaultValue,
buttonSize: 35.0,
textStyle: TextStyle(fontSize: 25.0),
minValue: 0,
color: Colors.black,
maxValue: 80,
step: 1,
decimalPlaces: 0,
onChanged: (value) {
// get the latest value from here
setState(() {
defaultValue = value;
});
},
),
],
),
),
],
),
),
),
),
),
SizedBox(
height: 20.0,
),
FadeAnimation(
1.9,
MaterialButton(
shape: OutlineInputBorder(borderSide: BorderSide(width: 1.0)),
color: Colors.black,
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 10.0, horizontal: 20.0),
child: Text(
"Next",
style: TextStyle(
fontSize: 18.0,
color: Colors.white,
),
),
),
onPressed: () async {
if (_formKey.currentState.validate()) {
InsertUserModel result = await insertData();
// var imageResult = await uploadImage(result.id);
print(result.data[0].id);
if (_image != null) {
await uploadImage(result.data[0].id);
}
setState(() {
_loading = false;
});
if (result != null) {
await prefs.setString("userID", result.data[0].id);
final snackBar = SnackBar(
content: Text(
result.message,
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.green,
duration: Duration(milliseconds: 2000),
);
_scaffoldKey.currentState.showSnackBar(snackBar);
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => LetGoUI(result.data[0].id),
));
} else {
final snackBar = SnackBar(
content: Text(
"Here is some error, please try again later!",
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.red,
duration: Duration(milliseconds: 2000),
);
_scaffoldKey.currentState.showSnackBar(snackBar);
}
}
},
),
)
],
),
),
),
);
}
}
我真的不明白问题出在哪里，因为我没有使用任何英雄，也没有双FloatingActionButton。
我该如何解决？ 谢谢
答案 0 :(得分：0)
导航时显示小吃栏可能存在问题。您应该在导航之前通过调用以下方法来解决该问题。
void removeSnackBarCallsBeforeNavigation() {
ScaffoldMessenger.of(context).removeCurrentSnackBar();
}