如何将谷歌地图视图移动到Flutter中键入的地址

Question

目前，我在android中创建了一个地图应用程序。用户将在文本字段中键入地址，然后地图将显示位置。应用程序总是被迫关闭，我不知道有什么问题，如果有任何帮助，我们将不胜感激。

这是我的控制台结果：

E/AndroidRuntime(26283(：致命异常：AsyncTask#2E/AndroidRuntime(26283(：进程：com.example.service_platform，PID:26283E/AndroidRuntime(26283(：java.lang.IollegalArgumentException：locationName==nullE/AndroidRuntime(26283(：位于android.location.Geocoder.getFromLocationName(Geocoder.java:171(E/AndroidRuntime(26283(：位于com.baseflow.geolocator.tasks.ForwardGeocodingTask$1.run(ForwardGeoodingTask.java:42(E/AndroidRuntime(26283(：在android.os.AsyncTask$SerialExecutor$1.run上(AsyncTask.java:245(E/AndroidRuntime(26283(：位于java.util.concurrent.ThreadPoolExecutiator.runWorker(ThreadPoolExecutiator.java:1167(E/AndroidRuntime(26283(：位于java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641(E/AndroidRuntime(26283(：在java.lang.Thread.run(Thread.java：764(I/Process(26283(：发送信号。PID：26283 SIG:9

这是我转换searchAddress的代码：

searchandNavigate(){
Geolocator().placemarkFromAddress(searchAddr).then((result) => {
mapController.animateCamera(CameraUpdate.newCameraPosition(
CameraPosition(target: LatLng(result[0].position.latitude,result[0].position.longitude), zoom: 15)
))
});
}

这是完整的代码：

import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:service_platform/common/helper/size_config.dart';
class ProfileMap extends StatefulWidget {
@override
_ProfileMapState createState() => _ProfileMapState();
}
class _ProfileMapState extends State<ProfileMap> {
LatLng point = LatLng(-6.200000, 106.816666);

Set<Marker> _marker={};
String searchAddr;
GoogleMapController mapController;
searchandNavigate(){
Geolocator().placemarkFromAddress(searchAddr).then((result) => {
mapController.animateCamera(CameraUpdate.newCameraPosition(
CameraPosition(target: LatLng(result[0].position.latitude,result[0].position.longitude), zoom: 15)
))
});
}
void onMapCreated(GoogleMapController controller){
mapController = controller;
}
void _onMapTap(p){
setState(() {
point = p;
_marker.clear();
_marker.add(Marker(
markerId: MarkerId('id_0'),
position: point,
draggable: true,
));
});
}
@override
Widget build(BuildContext context) {
SizeConfig().init(context);
var size = MediaQuery.of(context).size;
return Scaffold(
resizeToAvoidBottomInset: true,
appBar: AppBar(
backgroundColor: Colors.white,
title: Text('Place Pin Point', style: TextStyle(color: Color(0xff222222))),
centerTitle: true,
titleTextStyle: TextStyle(color: Color(0xff222222), fontWeight: FontWeight.w700, fontSize: 16),
iconTheme: IconThemeData(
color: Color(0xffee3124)
),
),
body: Stack(
alignment: Alignment.bottomCenter,
children: [
GoogleMap(
onMapCreated: onMapCreated,
initialCameraPosition: CameraPosition(
target: LatLng(22.22, 88.88),
zoom: 15
),
markers: _marker,
onTap: _onMapTap,
zoomControlsEnabled: false,
),
Padding(
padding: const EdgeInsets.all(16),
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(4)
),
child: Card(
child: TextFormField(
onChanged: (val){
setState(() {
searchAddr = val;
});
},
onEditingComplete: searchandNavigate,
),
),
),

)
]
),
);
}
}

提前感谢

Answer 1

好的，我发现了错误，这是因为程序处理时地址仍然是null。只需添加If(address!="")就可以解决所有问题。