如何在flutter中获取用户的位置

Question

我想定位用户并通过api将他的位置坐标发送到服务器，请用代码回答，我已经尝试过库地理定位器：^7.7.0

void getCurrentLocation() async {
     Position position = await Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
     var lat = position.latitude;
     var long = position.longitude;
 print("Latitude: $lat and Longitude: $long");
   }

此代码不起作用，错误：

[ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: MissingPluginException(No implementation found for method getCurrentPosition on channel flutter.baseflow.com/geolocator)
E/flutter (25476): #0      MethodChannel._invokeMethod
package:flutter/…/services/platform_channel.dart:156
E/flutter (25476): <asynchronous suspension>
E/flutter (25476): #1      MethodChannelGeolocator.getCurrentPosition (package:geolocator_platform_interface/src/implementations/method_channel_geolocator.dart:128:27)
E/flutter (25476): <asynchronous suspension>
E/flutter (25476): #2      getCurrentLocation
package:check_time/Screens/fingerprint_Screen.dart:84
E/flutter (25476): <asynchronous suspension>

Answer 1

再次构建应用程序。试试这个代码。

    Future<void> getCurrentLocation() async {
      Position position = await Geolocator.getCurrentPosition(
                           desiredAccuracy:LocationAccuracy.high);
      double lat = position.latitude;
      double long = position.longitude;
      print("Latitude: $lat and Longitude: $long");
  }

Answer 2

尝试重新启动应用程序！应该从那里开始工作。当你添加插件时热重启将不起作用。

Answer 3

如果您没有按照所需的应用平台对应用进行更改，通常会发生此错误。

即 Android、iOS、Web

转到Usage

下的包描述中的

包

遵循您正在构建的平台的实施步骤

Answer 4

您需要遵循一些有用的步骤，这些步骤在软件包的自述文件中提到。更新

android\app\build.gradle

android {
  compileSdkVersion 31

  ...
}

Answer 5

尝试下面的代码希望对您有帮助，请参考

geolocator

这里和

geocoding

这里获取纬度和经度以及您的位置名称

为您当前的位置创建位置和一个变量以及

init()

方法

Position? _currentPosition;
  String? _currentAddress;
  void initState() {
    super.initState();
    getCurrentLocation();
  }

获取经纬度函数

 getCurrentLocation() {
    Geolocator.getCurrentPosition(
            desiredAccuracy: LocationAccuracy.best,
            forceAndroidLocationManager: true)
        .then((Position position) {
      setState(() {
        _currentPosition = position;
         print(position.latitude);
         print(position.longitude);
        _getAddressFromLatLng();
      });
    }).catchError((e) {
      print(e);
    });
  }

根据您的纬度和经度定位的函数

_getAddressFromLatLng() async {
    try {
      List<Placemark> placemarks = await placemarkFromCoordinates(
          _currentPosition!.latitude, _currentPosition!.longitude);

      Placemark place = placemarks[0];

      setState(() {
        _currentAddress = "${place.subLocality}";//here you can used place.country and other things also
        print(_currentAddress);
      });
    } catch (e) {
      print(e);
    }
  }

您的小部件：

Column(
      children: [
        if (_currentPosition != null && _currentAddress != null)
          Text(
            _currentAddress!,
            style: TextStyle(
              fontWeight: FontWeight.bold,
              letterSpacing: .5,
              fontSize: 15,
              color: Colors.black,
            ),
          ),
      ],
    )

在

android\app\src\main\AndroidManifest.xml

标签上方的

application

文件中添加以下行

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

转到

android\app\build.gradle

文件并更改以下更改

compileSdkVersion 31
minSdkVersion 21
targetSdkVersion 29