Question

我的代码没有错误地获取用户位置。当用户拒绝对该位置的访问并且稍后他想允许它时，就会出现问题。我不知道如何处理这个过程。

这些是步骤：

initState 询问位置 -> 如果用户允许访问一切正常。

initState -> 用户拒绝访问。如果用户拒绝访问，我将无法再次请求访问，因此我将永远不会获得用户的职位。我需要了解如何处理拒绝阶段。这是代码：

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:geocoder/geocoder.dart';
import 'package:geolocator/geolocator.dart';

class Maps extends StatefulWidget {
static Future<void> show(
  BuildContext context,
) async {
  await Navigator.of(context).push(
    MaterialPageRoute(
      builder: (context) => Maps(),
      fullscreenDialog: true,
    ),
  );
  }
@override
_MapsState createState() => _MapsState();
}

Future<Position> locateUser() async {
return Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
}

class _MapsState extends State<Maps> {
Geolocator geolocator = Geolocator();

String _location;
String _addressLine;
bool done = false;

@override
void initState() {
  _getCurrentLocation();
  super.initState();
}

@override
Widget build(BuildContext context) {
  return CupertinoPageScaffold(
    navigationBar: _navBar(),
    child: Center(
      child: Container(
        height: MediaQuery.of(context).size.height * 0.4,
        width: MediaQuery.of(context).size.width * 0.6,
        child: Center(
          child: Column(
            children: [
              done == false
                  ? textOnScreen("Need to get the position")
                  : textOnScreen("val 1: $_location, val 2: $_addressLine"),
              FlatButton(
                child: Text("Get location"),
                onPressed: () {
                  setState(() {
                    done = false;
                    _getCurrentLocation();
                  });
                },
              ),
            ],
          ),
        ),
      ),
    ),
  );
}

Widget textOnScreen(String text) {
  return FlatButton(
    onPressed: null,
    child: Text(text),
  );
}

Widget _navBar() {
  return CupertinoNavigationBar(
    backgroundColor: Colors.blue,
    middle: Text(
      'Get position',
      style: TextStyle(
        color: Colors.white,
      ),
    ),
  );
}

Future<void> _getLocation(Position position) async {
  debugPrint('location: ${position.latitude}');
  final coordinates = new Coordinates(position.latitude, position.longitude);
  List<Address> addresses =
      await Geocoder.local.findAddressesFromCoordinates(coordinates);
  Address first = addresses.first;
  _location = "${first.featureName}";
  _addressLine = " ${first.addressLine}";
  setState(() {
    done = true;
  });
}

void _getCurrentLocation() {
  // if (await )
  Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.best)
      .then((Position position) {
    _getLocation(position);
  }).catchError((e) {
    print(e);
  });
}
}

多次请求位置权限颤动

0 个答案: