Flutter自动完成谷歌位置表单

Question

我想在我的文本表单字段实现自动完成谷歌的地方。然而，我有以下我无法理解。Google Places无法识别，Late被标记为文本。如果有人能帮我，那就太好了。提前谢谢你。我实际上有这个问题:

第一个错误:'GoogleMapPlaces'方法没有为'_RegisterScreen2State'类型定义。第二个错误:意外文本'late'.

你可以看到在我的图像中添加的红色标记的两个错误

**我使用的是最后一个flutter版本，flutter_google_places: ^0.3.0和geocoder: ^0.2.1

enum MobileVerificationState {
SHOW_MOBILE_FORM_STATE, // The user provides the phone number
SHOW_OTP_FORM_STATE // The user has to enter the code he received
}
class RegisterScreen2 extends StatefulWidget {
final UsersInformations user;
const RegisterScreen2(this.user);
@override
_RegisterScreen2State createState() => _RegisterScreen2State();
}
class _RegisterScreen2State extends State<RegisterScreen2> {
@override
void initState(){
super.initState();
_places = GoogleMapPlaces(apiKey: kGoogleApiKey);
}
final kGoogleApiKey = "MY IPA KEY";
late GoogleMapsPlaces _places = GoogleMapsPlaces(apiKey: kGoogleApiKey);
.....
getMobileFormWidget(context, user) {
return Scaffold(
backgroundColor: Colors.white,
body: Form(
child: SingleChildScrollView(
child: Column(
children: [
Stack(
children: [
Container(
height: 100,
decoration: BoxDecoration(
color: Colors.green.shade50,
borderRadius: const BorderRadius.only(
bottomLeft: Radius.circular(30),
bottomRight: Radius.circular(30))),
),
Padding(
padding: const EdgeInsets.only(top: 70),
child: Stack(
// ignore: prefer_const_literals_to_create_immutables
children: [
Center(
child: CircleAvatar(
radius: 60,
backgroundColor: Colors.white,
backgroundImage: image != null
? FileImage(image)
: const NetworkImage(
"https://cdn-icons-png.flaticon.com/512/1177/1177568.png"),
),
),
Positioned(
bottom: -5,
right: 145,
child: InkWell(
onTap: () => getImage(),
child: Icon(Icons.camera_alt_rounded)))
],
),
),
],
),
const SizedBox(
height: 20,
),
Padding(
padding: const EdgeInsets.all(10.0),
child: Padding(
padding: EdgeInsets.only(left: 15, right: 15, top: 5),
child: TextFormField(
decoration: InputDecoration(
enabledBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.grey.shade300)),
focusedBorder: UnderlineInputBorder(
borderSide:
BorderSide(color: Colors.deepPurple.shade900)),
focusedErrorBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.red.shade900)),
errorBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.red.shade900)),
hintText: "Adresse",
),
onChanged: (val) async {
Prediction p = await PlacesAutocomplete.show(
context: context,
apiKey: kGoogleApiKey,
mode: Mode.overlay, // Mode.fullscreen
language: "fr",
components: [
new Component(Component.country, "fr"),
]);
displayPrediction(p);
user.setAdress = val;
},
),
),
),

…

Future<Null> displayPrediction(Prediction p) async {
if (p != null) {
PlacesDetailsResponse detail =
await _places.getDetailsByPlaceId(p.placeId);
var placeId = p.placeId;
double lat = detail.result.geometry.location.lat;
double lng = detail.result.geometry.location.lng;
var address = await Geocoder.local.findAddressesFromQuery(p.description);
print(lat);
print(lng);
}
}
}

红色标记的问题

Answer 1

第一个错误是打字错误，您将GoogleMapPlaces写成了GoogleMapsPlaces

然后，您可以做两件事中的一件，这取决于您是否已经迁移到dart 2.13。

将您的late GoogleMapsPlaces _places = ....行更改为以下内容之一:

如果你有null-safety

late GoogleMapsPlaces _places;

如果你没有null-safety

GoogleMapsPlaces _places;

这应该可以修复你的两个错误。