问题描述
我对 Covid 项目有问题，它依赖于带有蓝牙的 Nearby Google 服务。 我的问题是：我找不到附近的设备：-
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:Flutter/material.dart';
import 'package:location/location.dart';
import 'package:nearby_connections/nearby_connections.dart';
import 'components/contact_card.dart';
import 'constants.dart';
class NearbyInterface extends StatefulWidget {
static const String id = 'nearby_interface';
@override
_NearbyInterfaceState createState() => _NearbyInterfaceState();
}
class _NearbyInterfaceState extends State<NearbyInterface> {
Location location = Location();
Firestore _firestore = Firestore.instance;
final Strategy strategy = Strategy.P2P_STAR;
FirebaseUser loggedInUser;
String testText = '';
final _auth = FirebaseAuth.instance;
List<dynamic> contactTraces = [];
List<dynamic> contactTimes = [];
List<dynamic> contactLocations = [];
void addContactsToList() async {
await getCurrentUser();
_firestore
.collection('users')
.document(loggedInUser.email)
.collection('met_with')
.snapshots()
.listen((snapshot) {
for (var doc in snapshot.documents) {
String currUsername = doc.data['username'];
DateTime currTime = doc.data.containsKey('contact time')
? (doc.data['contact time'] as Timestamp).toDate()
: null;
String currLocation = doc.data.containsKey('contact location')
? doc.data['contact location']
: null;
if (!contactTraces.contains(currUsername)) {
contactTraces.add(currUsername);
contactTimes.add(currTime);
contactLocations.add(currLocation);
}
}
setState(() {});
print(loggedInUser.email);
});
}
void deleteOldContacts(int threshold) async {
await getCurrentUser();
DateTime timeNow = DateTime.Now(); //get today's time
_firestore
.collection('users')
.document(loggedInUser.email)
.collection('met_with')
.snapshots()
.listen((snapshot) {
for (var doc in snapshot.documents) {
// print(doc.data.containsKey('contact time'));
if (doc.data.containsKey('contact time')) {
DateTime contactTime = (doc.data['contact time'] as Timestamp)
.toDate(); // get last contact time
// if time since contact is greater than threshold than remove the contact
if (timeNow.difference(contactTime).inDays > threshold) {
doc.reference.delete();
}
}
}
});
setState(() {});
}
void discovery() async {
try {
print("---------------------------");
print((await location.getLocation()).toString());
print(DateTime.Now().toString());
bool a = await Nearby().startdiscovery(
loggedInUser.email,strategy,onEndpointFound: (id,name,serviceId) async {
print('I saw id:$id with name:$name'); // the name here is an email
var docRef =
_firestore.collection('users').document(loggedInUser.email);
// When I discover someone I will see their email and add that email to the database of my contacts
// also get the current time & location and add it to the database
docRef.collection('met_with').document(name).setData({
'username': await getUsernameOfEmail(email: name),'contact time': DateTime.Now(),'contact location': (await location.getLocation()).toString(),});
},onEndpointLost: (id) {
print(id);
},serviceId: "com.egypt.covid",);
print('disCOVERING: ${a.toString()}');
} catch (e) {
print(e);
}
}
void getPermissions() {
Nearby().askLocationAndExternalStoragePermission();
}
Future<String> getUsernameOfEmail({String email}) async {
String res = '';
await _firestore.collection('users').document(email).get().then((doc) {
if (doc.exists) {
res = doc.data['username'];
} else {
// doc.data() will be undefined in this case
print("No such document!");
}
});
return res;
}
Future<void> getCurrentUser() async {
try {
final user = await _auth.currentUser();
if (user != null) {
loggedInUser = user;
}
} catch (e) {
print(e);
}
}
@override
void initState() {
super.initState();
deleteOldContacts(14);
addContactsToList();
getPermissions();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: Icon(
Icons.menu,color: Colors.deepPurple[800],),centerTitle: true,title: Text(
'TracerX',style: TextStyle(
color: Colors.deepPurple[800],fontWeight: FontWeight.bold,fontSize: 28.0,backgroundColor: Colors.white,body: Column(
children: <Widget>[
Expanded(
child: Padding(
padding: EdgeInsets.only(
left: 25.0,right: 25.0,bottom: 10.0,top: 30.0,child: Container(
height: 100.0,width: double.infinity,decoration: Boxdecoration(
color: Colors.deepPurple[500],borderRadius: BorderRadius.circular(20.0),BoxShadow: [
BoxShadow(
color: Colors.black,blurRadius: 4.0,spreadRadius: 0.0,offset:
Offset(2.0,2.0),// shadow direction: bottom right
)
],child: Row(
children: <Widget>[
Expanded(
child: Image(
image: Assetimage('images/corona.png'),Expanded(
flex: 2,child: Text(
'Your Contact Traces',textAlign: TextAlign.left,style: TextStyle(
fontSize: 21.0,color: Colors.white,fontWeight: FontWeight.w500,)
],Padding(
padding: EdgeInsets.only(bottom: 30.0),child: RaisedButton(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20.0)),elevation: 5.0,color: Colors.deepPurple[400],onpressed: () async {
try {
bool a = await Nearby().startAdvertising(
loggedInUser.email,onConnectionInitiated: null,onConnectionResult: (id,status) {
print(status);
},ondisconnected: (id) {
print('disconnected $id');
},);
print('ADVERTISING ${a.toString()}');
} catch (e) {
print(e);
}
discovery();
},child: Text(
'Start Tracing',style: kButtonTextStyle,Expanded(
flex: 2,child: Padding(
padding: EdgeInsets.symmetric(horizontal: 25.0),child: ListView.builder(
itemBuilder: (context,index) {
return ContactCard(
imagePath: 'images/profile1.jpg',email: contactTraces[index],infection: 'Not-Infected',contactUsername: contactTraces[index],contactTime: contactTimes[index],contactLocation: contactLocations[index],);
},itemCount: contactTraces.length,],);
}
}
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:contacttracingprototype/components/rounded_button.dart';
import 'package:contacttracingprototype/constants.dart';
import 'package:contacttracingprototype/nearby_interface.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:Flutter/material.dart';
import 'package:modal_progress_hud/modal_progress_hud.dart';
class RegistrationScreen extends StatefulWidget {
static const String id = 'registration_screen';
@override
_RegistrationScreenState createState() => _RegistrationScreenState();
}
class _RegistrationScreenState extends State<RegistrationScreen> {
final _auth = FirebaseAuth.instance;
Firestore _firestore = Firestore.instance;
bool showSpinner = false;
String email;
String password;
String userName;
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,body: Container(
decoration: Boxdecoration(
image: decorationImage(
image: Assetimage('images/bg1.jpg'),fit: BoxFit.cover,child: ModalProgressHUD(
inAsyncCall: showSpinner,child: Padding(
padding: EdgeInsets.symmetric(horizontal: 24.0),child: Column(
mainAxisAlignment: MainAxisAlignment.center,crossAxisAlignment: CrossAxisAlignment.stretch,children: <Widget>[
TextField(
textAlign: TextAlign.center,onChanged: (value) {
userName = value;
},decoration:
kTextFielddecoration.copyWith(hintText: 'Username'),SizedBox(
height: 8.0,TextField(
keyboardType: TextInputType.emailAddress,textAlign: TextAlign.center,onChanged: (value) {
email = value;
},decoration: kTextFielddecoration.copyWith(
hintText: 'Enter your email'),TextField(
obscureText: true,onChanged: (value) {
password = value;
},decoration: kTextFielddecoration.copyWith(
hintText: 'Enter your password'),SizedBox(
height: 24.0,RoundedButton(
title: 'Register',colour: Colors.deepPurpleAccent,onpressed: () async {
setState(() {
showSpinner = true;
});
try {
final newUser =
await _auth.createuserWithEmailAndPassword(
email: email,password: password);
if (newUser != null) {
_firestore.collection('users').document(email).setData({
'username': userName,});
Navigator.pushNamed(context,NearbyInterface.id);
}
setState(() {
showSpinner = false;
});
} catch (e) {
print(e);
}
},);
}
}
上面的代码来发现附近的蓝牙设备并将他添加到他的列表中..所以我的问题是： 为什么我在附近找不到这些设备。 上面的代码发现附近的蓝牙设备并将他添加到他的列表中..所以我的问题是： 为什么我在附近找不到这些设备。
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。
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