I'm kinda new to Flutter + Dart, for my second app I want to work on a spotify app for android.
I found the spotify sdk on pub dev and did my best to work with the docs from spotify and from pub dev but I dont get the token :(
First of all: I have a debug.keystore in my ../android/app/ and put the debug sha1 fingerprint on spotify console with a callback url.
I did everything from the spotify_sdk readme.
I tried it with different callback methods like:
redirectUrl: http://bundle_id/callback,
redirectUrl: bundle_id://callback,
redirectUrl: http://bundleid/auth,
and everything with the client_id and client_secret (because the docs are not clear for me what I should use).
It would be great if you guys could help out. I'm alone and dont have dev friends to ask D:
This is my code
import 'package:flutter/material.dart';
import 'package:spotify_sdk/spotify_sdk.dart';
void main() {
runApp(const MaterialApp(
home: HomePage(),
));
}
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
#override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('spotify auth test'),
),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Align(
alignment: Alignment.center,
child: ElevatedButton(
onPressed: getAccessToken,
child: const Text('GIMMI TOKEN PLS'),
),
),
],
),
);
}
Future<String> getAccessToken() async {
try {
var authenticationToken = await SpotifySdk.getAccessToken(
clientId: 'client_id',
redirectUrl: 'redirectUrl',
scope: 'app-remote-control, '
'user-modify-playback-state, '
'playlist-read-private, '
'playlist-modify-public,user-read-currently-playing');
print('Got a token: $authenticationToken');
return authenticationToken;
} catch (e) {
print('$e.code, message $e.message');
return Future.error('$e.code: $e.message');
} /*catch (e) {
print('not implemented');
return Future.error('not implemented');
}*/
}
}
And this is my error log message:
I/flutter ( 7987): ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
I/flutter ( 7987): │ #0 SpotifySdk._logException (package:spotify_sdk/spotify_sdk.dart:633:15)
package:spotify_sdk/spotify_sdk.dart:633
I/flutter ( 7987): │ #1 SpotifySdk.getAccessToken (package:spotify_sdk/spotify_sdk.dart:128:7)
package:spotify_sdk/spotify_sdk.dart:128
I/flutter ( 7987): ├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
I/flutter ( 7987): │ ⛔ getAccessToken failed with: Authentication went wrong
I/flutter ( 7987): │ ⛔ AUTHENTICATION_SERVICE_UNKNOWN_ERROR
I/flutter ( 7987): └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
I/flutter ( 7987): PlatformException(authenticationTokenError, Authentication went wrong, AUTHENTICATION_SERVICE_UNKNOWN_ERROR, null).code, message PlatformException(authenticationTokenError, Authentication went wrong, AUTHENTICATION_SERVICE_UNKNOWN_ERROR, null).message
E/flutter ( 7987): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: PlatformException(authenticationTokenError, Authentication went wrong, AUTHENTICATION_SERVICE_UNKNOWN_ERROR, null).code: PlatformException(authenticationTokenError, Authentication went wrong, AUTHENTICATION_SERVICE_UNKNOWN_ERROR, null).message
E/flutter ( 7987):
Related
I am using the google_maps_flutter plugin to use google maps, I followed their instructions of setting up the minSdkVersion and including the API key in AndroidManifest.xml file. I am using their example code to test the plugin but I keep getting these errors in my debug console
E/flutter (16699): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Bad state: Future already completed
E/flutter (16699): #0 _AsyncCompleter.complete (dart:async/future_impl.dart:35:31)
E/flutter (16699): #1 _GoogleMapState.onPlatformViewCreated
package:google_maps_flutter/src/google_map.dart:413
E/flutter (16699): <asynchronous suspension>
E/flutter (16699):
main.dart (I got it from the plugin page)
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Google Maps Demo',
home: MapSample(),
);
}
}
class MapSample extends StatefulWidget {
#override
State<MapSample> createState() => MapSampleState();
}
class MapSampleState extends State<MapSample> {
Completer<GoogleMapController> _controller = Completer();
static final CameraPosition _kGooglePlex = CameraPosition(
target: LatLng(37.42796133580664, -122.085749655962),
zoom: 14.4746,
);
static final CameraPosition _kLake = CameraPosition(
bearing: 192.8334901395799,
target: LatLng(37.43296265331129, -122.08832357078792),
tilt: 59.440717697143555,
zoom: 19.151926040649414);
#override
Widget build(BuildContext context) {
return new Scaffold(
body: GoogleMap(
mapType: MapType.hybrid,
initialCameraPosition: _kGooglePlex,
onMapCreated: (GoogleMapController controller) {
_controller.complete(controller);
},
),
floatingActionButton: FloatingActionButton.extended(
onPressed: _goToTheLake,
label: Text('To the lake!'),
icon: Icon(Icons.directions_boat),
),
);
}
Future<void> _goToTheLake() async {
final GoogleMapController controller = await _controller.future;
controller.animateCamera(CameraUpdate.newCameraPosition(_kLake));
}
}
I did some debugging and found that
GoogleMap(
mapType: MapType.hybrid,
initialCameraPosition: _kGooglePlex,
onMapCreated: (GoogleMapController controller) {
_controller.complete(controller);
},
),
in my main.dart file is causing the error, when I remove it I get no errors but no map as well.
In addition when I follow the link given to me in my debug console
E/flutter (16699): #1 _GoogleMapState.onPlatformViewCreated
package:google_maps_flutter/src/google_map.dart:413
It shows me this function which I think is the root problem causing the future error
Future<void> onPlatformViewCreated(int id) async {
final GoogleMapController controller = await GoogleMapController.init(
id,
widget.initialCameraPosition,
this,
);
_controller.complete(controller);
_updateTileOverlays();
final MapCreatedCallback? onMapCreated = widget.onMapCreated;
if (onMapCreated != null) {
onMapCreated(controller);
}
}
And highlights line 413 which is
_controller.complete(controller);
Try to declare the GoogleMapController as a late variable in your MapSampleState class instead of using the Completer:
late GoogleMapController _controller;
And update the onMapCreated function:
onMapCreated: (GoogleMapController controller) {
_controller = controller;
},
I don't know what is wrong with your code but it works for me this way (Flutter 3.3.8, google_maps_flutter 2.2.1).
If it works, make sure you don't try to use the controller before it is created or you will get a late initalization error. Alternatively, you can declare _controller as nullable, and check it is null before trying to use it:
GoogleMapController? _controller;
I am trying to share a file using SharePlus. However, I get the following error:
The task is to generate a PDF file and share it through ios and android. I see that share_plus is able to share the file. However, I am unable to share by saving it in the applicationDocumentDirectory.
Update: I have attached a demo repo with codes from below. The error is showing in my app even when the repo is working without permissions fine. share_plus complains with below issues.
Repo: Link
Error:
Unhandled Exception: PlatformException(error, Failed to find configured root that contains /data/user/0/com.example.flutter_share_demo/app_flutter/someRandom.pdf, null, java.lang.IllegalArgumentException: Failed to find configured root that contains /data/user/0/com.example.flutter_share_demo/app_flutter/someRandom.pdf
The code is as follows:
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:permission_handler/permission_handler.dart';
import 'package:share_plus/share_plus.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
const MyHomePage({
Key? key,
}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Share files')),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Center(
child: TextButton(
child: const Text('Generate and Share PDF'),
onPressed: () async {
final pdf = pw.Document();
pdf.addPage(pw.Page(
build: (context) =>
pw.Center(child: pw.Text('Hello, World!')),
));
final Directory storageDir = getApplicationDocumentDirectory();
try {
File file = File('${storageDir.path}/someRandom.pdf');
await file.writeAsBytes(await pdf.save());
print(file.path);
print('File exists: ${await file.exists()}');
Share.shareFiles([file.path], subject: 'Shared file');
} else {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('Permission denied')));
}
} on PlatformException catch (ex) {
print(ex);
} catch (ex) {
print(ex);
}
},
),
),
],
));
}
}
I am trying to implement a simple login/signup screen on flutter, connected to firebase.
The flow is supposed to be as follows:
Main => Wrapper
Wrappper => if user==NULL, then Authenticate, else Home
Authenticate => Login or Signup
The issue is occuring in the Wrapper file. When the code is run, initially the user will be NULL and has to go to the Login screen. However, my code goes directly to the Home screen.
The codes for each file are as follows:
main.dart
void main() async {
await Firebase.initializeApp();
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return StreamProvider<MyUser>.value(
value: AuthService().user,
initialData: null,
child: MaterialApp(
home: Wrapper(),
debugShowCheckedModeBanner: false,
)
);
}
}
wrapper.dart
class Wrapper extends StatelessWidget {
#override
Widget build(BuildContext context) {
final user = Provider.of<MyUser>(context);
if (user == null) {
return Authenticate();
} else {
//return PatientHome();
}
}
}
authenticate.dart
class Authenticate extends StatefulWidget {
#override
_AuthenticateState createState() => _AuthenticateState();
}
class _AuthenticateState extends State<Authenticate> {
bool showSignIn = true;
void toggleView() {
setState(() => showSignIn = !showSignIn);
}
#override
Widget build(BuildContext context) {
if (showSignIn) {
return Login(toggleView: toggleView);
} else {
return Register(toggleView: toggleView);
}
}
}
auth.dart
class AuthService {
final FirebaseAuth _auth = FirebaseAuth.instance;
// create user obj based on firebase user
MyUser _userFromFirebaseUser(User user) {
return user != null ? MyUser(uid: user.uid) : null;
}
// auth change user stream
Stream<MyUser> get user {
return _auth.authStateChanges()
//.map((FirebaseUser user) => _userFromFirebaseUser(user));
.map(_userFromFirebaseUser);
}
// sign in with email and password
Future signInWithEmailAndPassword(String email, String password) async {
try {
UserCredential result = await _auth.signInWithEmailAndPassword(email: email, password: password);
User user = result.user;
return _userFromFirebaseUser(user);
} catch (error) {
print(error.toString());
return null;
}
}
// register with email and password
Future registerWithEmailAndPassword(String email, String password) async {
try {
UserCredential result = await _auth.createUserWithEmailAndPassword(email: email, password: password);
User user = result.user;
return _userFromFirebaseUser(user);
} catch (error) {
print(error.toString()+"oollala");
return null;
}
}
// sign out
Future signOut() async {
try {
return await _auth.signOut();
} catch (error) {
print(error.toString());
return null;
}
}
}
register.dart
class Register extends StatefulWidget {
final Function toggleView;
Register({this.toggleView});
#override
RegisterPatient createState() => RegisterPatient();
}
class RegisterPatient extends State<Register> {
final AuthService _auth = AuthService();
final _formKey = GlobalKey<FormState>();
bool loading = false;
String email = '';
String password = '';
String error = '';
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
backgroundColor: Colors.deepPurple,
elevation: 0.0,
title: Text('Register'),
actions: <Widget>[
TextButton.icon(
onPressed: () => widget.toggleView(),
icon: Icon(Icons.person),
label: Text('Register as Patient'))
],
),
body: Container(
padding: EdgeInsets.symmetric(vertical: 20.0, horizontal: 50.0),
child: Form(
key: _formKey,
child: Column(
children: <Widget>[
SizedBox(height: 20.0),
TextFormField(
validator: (val) => val.isEmpty ? 'Enter email' : null,
onChanged: (val) {
setState(() => email = val);
},
),
SizedBox(height: 20.0),
TextFormField(
obscureText: true,
validator: (val) => val.length < 6 ? 'Enter a password 6+ chars long' : null,
onChanged: (val) {
setState(() => password = val);
},
),
SizedBox(height: 20.0),
RaisedButton(
color: Colors.deepPurple,
child: Text(
'Register',
style: TextStyle(color: Colors.white),
),
onPressed: () async {
if(_formKey.currentState.validate()){
setState(() => loading = true);
dynamic result = await _auth.registerWithEmailAndPassword(email, password);
if(result == null) {
setState(() {
error = 'Email/password incorrect';
loading = false;
});
} else {
Navigator.of(context).pop();
loading = false;
}
}
}
),
SizedBox(height: 12.0),
Text(
error,
style: TextStyle(color: Colors.red, fontSize: 14.0),
)
],
),
),
),
);
}
}
login.dart
similar to register.dart
The issue is that whenever I run this code, it always takes me to HomePage, even though it is supposed to go through the Authenticate file as user is supposed to be NULL.
EDIT 1:
I thought it was directing to Homepage rather than to Authenticate, however my screen is simply white. It does not do anything other than that.
Any idea what could be the issue?
EDIT 2:
The code runs like so, shows a white screen, and never terminated unless I forcibly do so. I changed from emulator to my phone, but it still the same. Any idea what could be the issue? I'm fairly new to flutter so I don't understand the error...
Launching lib\main.dart on sdk gphone x86 arm in debug mode...
Running Gradle task 'assembleDebug'...
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Debug service listening on ws://127.0.0.1:64181/vsky5JbFCKM=/ws
Syncing files to device sdk gphone x86 arm...
E/flutter ( 8057): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: Null check operator used on a null value
E/flutter ( 8057): #0 MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:142:86)
E/flutter ( 8057): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:148:36)
E/flutter ( 8057): #2 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:331:12)
E/flutter ( 8057): #3 MethodChannel.invokeListMethod (package:flutter/src/services/platform_channel.dart:344:41)
E/flutter ( 8057): #4 MethodChannelFirebase._initializeCore (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:30:37)
E/flutter ( 8057): #5 MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:77:13)
E/flutter ( 8057): #6 Firebase.initializeApp (package:firebase_core/src/firebase.dart:41:47)
E/flutter ( 8057): #7 main (package:hospicare_mobile/main.dart:14:18)
E/flutter ( 8057): #8 _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:142:25)
E/flutter ( 8057): #9 _rootRun (dart:async/zone.dart:1354:13)
E/flutter ( 8057): #10 _CustomZone.run (dart:async/zone.dart:1258:19)
E/flutter ( 8057): #11 _runZoned (dart:async/zone.dart:1789:10)
E/flutter ( 8057): #12 runZonedGuarded (dart:async/zone.dart:1777:12)
E/flutter ( 8057): #13 _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:138:5)
E/flutter ( 8057): #14 _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:283:19)
E/flutter ( 8057): #15 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
E/flutter ( 8057):
I think using shared preferences might help for saving some data inside the app even though the app is closed or restarted by the user .Even you can retrieve it again and if it has something in it you can navigate to homepage , if it is null you can navigate to authenticate page.
Visit :
https://pub.dev/packages/shared_preferences
Follow the steps to use it:
Add the following inside your authenticate page or signin page
SharedPreferences
data=awaitSharedPreferences.getInstance();
data.setString('your_key',your_data);
Add the following inside the main function before runapp function and make the main function as async
SharedPreferences data = await
SharedPreferences.getInstance();
var your_variable = data.getString('your_key');
i cant get subcollection that i created before. i am able to create subcollection named "sinav_gorselleri" after i pressed this RaisedButton and going to SinavOlusturPage with this code:
RaisedButton(
color: Colors.blue,
child: Text("Sınav oluştur"),
onPressed: () async{
final newDoc = await FirebaseFirestore.instance.collection("ders_sinavlari_olusturulanlar")
.add({"baslik": "4oluşturulanSınav2", "gorsel": "gorsel", "konu": "", "ogretmen": "ömer kalfa",
"sira": 3, "tarih": ""});
final idnewDoc = newDoc.id;
debugPrint(idnewDoc);
final newDoc_newCol = await newDoc.collection("sinav_gorselleri")
.add({"gorsel": "https://firebasestorage.googleapis.com/v0/b/sbycpaldemo.appspot.com/o/ders_notlari_gorseller%2Fyeni?alt=media&token=4af59ada-4a8b-45cc-86ef-2f691a5baf62"});
final idnewCol = await newDoc_newCol.id;
debugPrint(idnewCol);
Navigator.of(context,rootNavigator: true).pop('dialog');
Navigator.push(context, MaterialPageRoute(builder: (context)=> SinavOlusturPage(idnewDoc: idnewDoc,)));
}),
and in SinavOlusturPage i am expecting to get first doc in subcollection named "sinav_gorselleri" but cant get it with this code:
import 'dart:io';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
class SinavOlusturPage extends StatefulWidget{
final idnewDoc;
const SinavOlusturPage({Key key, this.idnewDoc}) : super(key: key);
#override
State<StatefulWidget> createState() {
// TODO: implement createState
return SinavOlusturPageState(this.idnewDoc);
}
}
class SinavOlusturPageState extends State {
final idnewDoc;
SinavOlusturPageState(this.idnewDoc);
File _imageSelected;
final _formKey = GlobalKey<FormState>();
final _scaffoldKey = GlobalKey<ScaffoldState>();
#override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(key: _scaffoldKey,
appBar: AppBar(
title: Text("SINAV OLUŞTURMA SAYFASI"),
),
body: ListView(
children: [
Center(
child: Text("..."),
StreamBuilder(
stream: FirebaseFirestore.instance.collection("ders_sinavlari_olusturulanlar/$idnewDoc/sinav_gorselleri").snapshots(),
builder: (context, snapshot){
final querySnapshot = snapshot.data();
return GridView.builder(
itemCount: 3,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
mainAxisSpacing: 10, crossAxisCount: 2,),
itemBuilder: (context, index){
final mapOlusturulan = querySnapshot.docs[index].data();
final idOlusturulan = querySnapshot.docs[index].id;
return GridTile(
child: Center(
child: Image.network(mapOlusturulan["gorsel"])),
);
});
})
],
),
);
}
}
i did tried
FirebaseFirestore.instance.collection("ders_sinavlari_olusturulanlar").doc(idnewDoc) .collection("sinav_gorselleri").snapshots(), also but cant do it. here is my error that i get all the time:
Performing hot reload...
Syncing files to device SNE LX1...
════════ Exception caught by image resource service ════════════════════════════════════════════════
The following ArgumentError was thrown resolving an image codec:
Invalid argument(s): No host specified in URI file:///gorsel
When the exception was thrown, this was the stack:
#0 _HttpClient._openUrl (dart:_http/http_impl.dart:2407:9)
#1 _HttpClient.getUrl (dart:_http/http_impl.dart:2328:48)
#2 NetworkImage._loadAsync (package:flutter/src/painting/_network_image_io.dart:89:59)
#3 NetworkImage.load (package:flutter/src/painting/_network_image_io.dart:50:14)
#4 ImageProvider.resolveStreamForKey.<anonymous closure> (package:flutter/src/painting/image_provider.dart:504:13)
...
Image provider: NetworkImage("gorsel", scale: 1.0)
Image key: NetworkImage("gorsel", scale: 1.0)
════════════════════════════════════════════════════════════════════════════════════════════════════
════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The method 'call' was called on null.
Receiver: null
Tried calling: call()
The relevant error-causing widget was:
StreamBuilder<QuerySnapshot> file:///C:/ornekler/sby_cpal_demo/lib/Dersler/SinavOlusturPage.dart:39:9
════════════════════════════════════════════════════════════════════════════════════════════════════
Reloaded 22 of 694 libraries in 3.748ms.
════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The following NoSuchMethodError was thrown building StreamBuilder<QuerySnapshot>(dirty, state: _StreamBuilderBaseState<QuerySnapshot, AsyncSnapshot<QuerySnapshot>>#41144):
Class 'QuerySnapshot' has no instance method 'call'.
Receiver: Instance of 'QuerySnapshot'
Tried calling: call()
The relevant error-causing widget was:
StreamBuilder<QuerySnapshot> file:///C:/ornekler/sby_cpal_demo/lib/Dersler/SinavOlusturPage.dart:39:9
When the exception was thrown, this was the stack:
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1 SinavOlusturPageState.build.<anonymous closure> (package:sby_cpal_demo/Dersler/SinavOlusturPage.dart:42:50)
#2 StreamBuilder.build (package:flutter/src/widgets/async.dart:525:81)
#3 _StreamBuilderBaseState.build (package:flutter/src/widgets/async.dart:129:48)
#4 StatefulElement.build (package:flutter/src/widgets/framework.dart:4744:28)
...
════════════════════════════════════════════════════════════════════════════════════════════════════
════════ Exception caught by image resource service ════════════════════════════════════════════════
Invalid argument(s): No host specified in URI file:///gorsel
════════════════════════════════════════════════════════════════════════════════════════════════════
"gorsel" is my unique field key of subcollection document. this error realy makes me tired but really need to use subcollections in my app.
i didnt solved this with codings i just removed all the codes, pages and stuffs recorded to firebase firestore and rewrite them all step by step. i guess i get the reason of the error. it was about navigation time. after i pressed the button named Sinav Oluştur i was expecting the creation of the subcollection named "soru_gorselleri" of new document firstly and then navigation to SinavOlusturPage but all of these were happennig reversely so the Page was returning null. after i did all of them step by step with different RisedButtons , all of errors gone and happy end.
I have a problem in intergrating a simple GoogleMap in my Flutter App.
I correctly inserted the API Key in my Manifest file and inserted the library in the app.
But the emulator is just showing a blank page. I am doing nothing special until now; just trying to create a GoogleMap.
This is the Code i am using in the App:
return Stack(
children: <Widget>[
GoogleMap(initialCameraPosition: CameraPosition(target:
LatLng(-33.870840,151.206286),
zoom: 12)
)
], );
What the emulator is showing:
The first lines in the console(which i think are of special meaning):
E/flutter ( 5736): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(error, java.lang.IllegalStateException: Trying to create a platform view of unregistered type: plugins.flutter.io/google_maps
I tried several workarounds but only ended up with more errors. Looking Forward to your answers!
I tried to add Google Map in a fresh project and was able to see it on emulator successfully. I followed this article step by step and used your code snippet to show the map and it worked.
Complete code used:
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
Completer<GoogleMapController> _controller = Completer();
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Maps Sample App'),
backgroundColor: Colors.green[700],
),
body: Stack(
children: <Widget>[
GoogleMap(initialCameraPosition: CameraPosition(target:
LatLng(-33.870840,151.206286),
zoom: 12)
)
],
)
),
);
}
}
Couple of points to note:
Double check if the api is enabled (Maps SDK for Android) when you generated key for it.
Do flutter clean once you cross-check to confirm you've latest dependencies.
Hope this helps.