地理定位器6.0.0+1 distance Between()在颤振中不起作用

Question

我希望每个人都是安全的，我正在使用flutter，我想计算两个位置之间的距离，所以我在这里安装了pub.dev的地理定位器6.0.0+1，这样我可以找到用户的位置，但我不能使用名为**distance between((**的内置方法，该方法用于计算两个纬度和经度之间的距离，它向我显示了一个错误，它说**方法"distance Between"没有为类型"_RegisterState"定义。**我使用了文档中显示的方法

这是我的代码：

import 'dart:html;
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:staffattendence05/Usermodel.dart';
import 'package:staffattendence05/add_user.dart';
import 'package:staffattendence05/authenticate.dart';
import 'package:staffattendence05/fauth.dart';
import 'package:staffattendence05/home.dart';
import 'package:staffattendence05/styling.dart';
import 'package:flutter_spinkit/flutter_spinkit.dart';
import 'package:staffattendence05/loading.dart';
import 'package:geolocator/geolocator.dart';
import 'Login_ins.dart';
class Register extends StatefulWidget {
@override
_RegisterState createState() => _RegisterState();
}
class _RegisterState extends State<Register> {
@override
final _formkey = GlobalKey<FormState>();
String email = '';
String error = '';
String password = '';
bool loading = false;
final Authservice _auth = Authservice();
Widget build(BuildContext context) {
return loading
? Loading()
: Scaffold(
backgroundColor: Colors.teal,
appBar: AppBar(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(5),
),
title: Text(
"Register your institute",
style:
TextStyle(fontWeight: FontWeight.bold, color: Colors.white),
),
actions: <Widget>[
Padding(
padding: const EdgeInsets.all(8.0),
child: FlatButton.icon(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10)),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Loginins()),
);
},
icon: Icon(Icons.perm_identity),
label: Text("institute Login"),
color: Colors.teal,
),
)
],
backgroundColor: Colors.green[400],
),
body: Padding(
padding: const EdgeInsets.all(36.0),
child: Form(
key: _formkey,
child: Column(
children: <Widget>[
SizedBox(
height: 120.0,
),
TextFormField(
decoration: styling.copyWith(hintText: "Admin email"),
validator: (val) {
return val.isEmpty
? "please enter an valid email id"
: null;
},
onChanged: (val) {
email = val;
},
),
SizedBox(
height: 20.0,
),
TextFormField(
obscureText: true,
decoration: styling.copyWith(hintText: "Admin password"),
validator: (val) => val.length < 6
? "a password should contain atleast 6 characters"
: null,
onChanged: (val) => password = val,
),
SizedBox(
height: 25.0,
),
RaisedButton(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(7)),
color: Colors.green[400],
child: Text(
"Register",
style: TextStyle(fontWeight: FontWeight.bold),
),
onPressed: () async {
if (_formkey.currentState.validate()) {
setState(() {
loading = true;
});
Position Insposition = await getCurrentPosition(
desiredAccuracy: LocationAccuracy.best);
dynamic result =
await _auth.Signupwithemailandpassword(
email, password, Insposition);
final String adminname = email;
double distanceInMeters = distanceBetween(
52.2165157, 6.9437819, 52.3546274, 4.8285838);
print("1111111111111$adminname");
print(Insposition);
if (result == null) {
setState(() {
loading = false;
error = 'Please enter a valid email address!';
});
} else {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Home(
adminname: adminname,
)),
);
}
}
},
),
SizedBox(height: 20.0),
Text(
error,
style: TextStyle(
color: Colors.red[400],
fontWeight: FontWeight.bold,
fontSize: 14),
)
],
),
),
),
);
}
}

`如果有人指出我犯的错误，那就太好了。提前谢谢。

Answer 1

[已解决]

之间的距离

GeolocatorPlatform.distanceBetween(startLatitude, startLongitude, endLatitude, endLongitude);

对于方位距离

GeolocatorPlatform.bearingBetween(startLatitude, startLongitude, endLatitude, endLongitude);

在撰写此答案时，官方文件是不正确的。我尝试了上面的其他两个答案，但都不起作用，如果你尝试这些代码，它对我起作用，希望这也能解决你的问题。[版本：地理定位器6.0.0+1]

吉特https://github.com/Baseflow/flutter-geolocator/issues/496#issuecomment-683861804

Answer 2

查看GitHub页面和包的源代码，pub.dev上的文档似乎已经过时。正确的用法似乎是：

double distanceInMeters = GeolocatorPlatform.instance.distanceBetween(
52.2165157, 
6.9437819, 
52.3546274, 
4.8285838,
);

Answer 3

这样做，

double distanceInMeters = await Geolocator().distanceBetween(
52.2165157, 6.9437819, 52.3546274, 4.8285838);

Answer 4

以上都不在我的地理定位器包中-我已经完成了flutter pub升级，在我的pubspec.yaml上，参考如下：地理定位器：解决我问题的代码是：

double distance = await geolocator.distanceBetween(double.tryParse(lat1),
double.tryParse(long1), double.tryParse(lat2), double.tryParse(long2));