farmer_client/lib/utils/location.dart

import 'package:location/location.dart';

Future requireLocation() async {
  Location location = Location();
  bool _serviceEnabled;
  PermissionStatus _permissionGranted;

  _serviceEnabled = await location.serviceEnabled();
  if (!_serviceEnabled) {
    _serviceEnabled = await location.requestService();
    if (!_serviceEnabled) {
      throw Exception("请开启系统定位功能");
    }
  }

  _permissionGranted = await location.hasPermission();
  if (_permissionGranted == PermissionStatus.denied) {
    _permissionGranted = await location.requestPermission();
    if (_permissionGranted != PermissionStatus.granted) {
      throw Exception("请设置允许当前程序定位功能");
    }
  }

  return location;
}