I'm using the file_picker plugin to provide me with a path where to store my result which is an Uint8List. Here is (a simple version) of my code:
//this is way bigger in reality
Uint8List result = Uint8List.fromList([1,2,3,4]);
String? path = await FilePicker.platform.getDirectoryPath(dialogTitle: "Pick destination");
if (path == null) return;
io.File encryptedFile = io.File("$path/myfilename.myExtension");
encryptedFile.writeAsBytes(result);
I've got the following error:
[VERBOSE-2:ui_dart_state.cc(209)] Unhandled Exception: FileSystemException:
Cannot open file, path = '/private/var/mobile/Containers/Shared/AppGroup/
7FEABE47-9622-41B8-91F7-A4147840C272/File Provider Storage/Encrypted/
Gescanntes Dokument.pdf.aescryptor'
(OS Error: Operation not permitted, errno = 1)
#0 _File.open.<anonymous closure> (dart:io/file_impl.dart:356:9)
#1 _rootRunUnary (dart:async/zone.dart:1436:47)
#2 _CustomZone.runUnary (dart:async/zone.dart:1335:19)
<asynchronous suspension>
How can I fix this?
Related
I have downloaded a Wikipedia dump and I am trying to read it line by line. But when doing the utf8-decode I get the following error
12633: FormatException: Unfinished UTF-8 octet sequence (at offset 65536)
Stacktrace :#0 _Utf8Decoder.convertSingle (dart:convert-patch/convert_patch.dart:1789:7)
#1 Utf8Decoder.convert (dart:convert/utf.dart:351:42)
#2 Utf8Codec.decode (dart:convert/utf.dart:63:20)
#3 _MapStream._handleData (dart:async/stream_pipe.dart:213:31)
#4 _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:153:13)
#5 _RootZone.runUnaryGuarded (dart:async/zone.dart:1618:10)
#6 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#7 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#8 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:774:19)
#9 _StreamController._add (dart:async/stream_controller.dart:648:7)
#10 _StreamController.add (dart:async/stream_controller.dart:596:5)
#11 _FileStream._readBlock.<anonymous closure> (dart:io/file_impl.dart:98:19)
<asynchronous suspension>
That is this line
ar جزر_غالاباغوس 1 0
So I tried saving the file utf-8 encoded with this button
But that does not seem to work
This is my code
final filePath = p.join(
Directory.current.path,
'bin\\migrate_most_views\\data\\pageviews-20220416-170000',
);
final file = File(filePath);
logger.stderr('exporting pageviews...');
StreamSubscription? reader;
int lineNumer = 0;
reader = file.openRead().map(utf8.decode).transform(LineSplitter()).listen(
(line) {
final page = MostViewedPageDaily.fromLine(line);
db.collection('page_views').insert(page.toMap());
lineNumer++;
if (lineNumer % 1000 == 0) {
logger.stdout('inserting at line $lineNumer');
}
},
onDone: () {
logger.stdout('Reader read $lineNumer lines');
reader?.cancel();
exit(0);
},
onError: (error, stackTrace) {
final message = '$lineNumer: $error\n\nStacktrace :$stackTrace';
logger.stdout(logger.ansi.error(message));
exit(1);
},
cancelOnError: true,
);
What can I do?
I downloaded the file from here
https://dumps.wikimedia.org/other/pageviews/2022/2022-04/pageviews-20220417-010000.gz
You should use file.openRead().transform(utf8.decoder) instead of file.openRead().map(utf8.decode). (Also note the argument difference: utf8.decoder is a Utf8Decoder object, and utf8.decode is a method tear-off.)
The Stream.map documentation specifically discusses this:
Unlike transform, this method does not treat the stream as chunks of a single value. Instead each event is converted independently of the previous and following events, which may not always be correct. For example, UTF-8 encoding, or decoding, will give wrong results if a surrogate pair, or a multibyte UTF-8 encoding, is split into separate events, and those events are attempted encoded or decoded independently.
I'm getting those error when using FCM plugin in IOS, anyone know why and how I can solve this issue ?
Btw it works in Android.
════════════════════════════════════════════════════════════════════════════════════════════════════
[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method requestNotificationPermissions on channel plugins.flutter.io/firebase_messaging)
#0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:154:7)
<asynchronous suspension>
#1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:329:12)
#2 FirebaseMessaging.requestNotificationPermissions (package:firebase_messaging/firebase_messaging.dart:87:21)
#3 _HomeState.getIOSPermission (package:in_jesus_name/screens//home.dart:153:24)
#4 _HomeState.configurePushNotificationsFirebaseUser (package:in_jesus_name/screens//home.dart:227:7)
<asynchronous suspension>
#5 _HomeState.handleFirebaseSignIn (package:in_jesus_name/screens//home.dart:143:9)
<asynchronous suspension>
#6 _HomeState.initState.<anonymous closure> (package:in_jesus_name/screens//home.dart:822:7)
#7 _rootRunUnary (dart:async/zone.dart:1192:38)
#8 <…>
[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method getToken on channel plugins.flutter.io/firebase_messaging)
#0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:154:7)
<asynchronous suspension>
#1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:329:12)
#2 FirebaseMessaging.getToken (package:firebase_messaging/firebase_messaging.dart:150:27)
#3 _HomeState.configurePushNotificationsFirebaseUser (package:in_jesus_name/screens//home.dart:245:24)
#4 _rootRunUnary (dart:async/zone.dart:1192:38)
#5 _CustomZone.runUnary (dart:async/zone.dart:1085:19)
#6 _FutureListener.handleValue (dart:async/future_impl.dart:141:18)
#7 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#8 Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#9 Future._completeWithValue (dart:async/future_impl.dart:526:5)
<…>
[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method configure on channel plugins.flutter.io/firebase_messaging)
#0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:154:7)
<asynchronous suspension>
#1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:329:12)
#2 FirebaseMessaging.configure (package:firebase_messaging/firebase_messaging.dart:114:14)
#3 _HomeState.configurePushNotificationsFirebaseUser (package:in_jesus_name/screens//home.dart:250:24)
#4 _rootRunUnary (dart:async/zone.dart:1192:38)
#5 _CustomZone.runUnary (dart:async/zone.dart:1085:19)
#6 _FutureListener.handleValue (dart:async/future_impl.dart:141:18)
#7 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#8 Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#9 Future._completeWithValue (dart:async/future_impl.dart:526:5<…>
Here a code sample where those error came from :
[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method requestNotificationPermissions on channel plugins.flutter.io/firebase_messaging)
getIOSPermission() {
_firebaseMessaging.requestNotificationPermissions(
IosNotificationSettings(alert: true, badge: true, sound: true));
_firebaseMessaging.onIosSettingsRegistered.listen((settings) {
print("Settings registered:$settings");
});
}
[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method getToken on channel plugins.flutter.io/firebase_messaging)
_firebaseMessaging.getToken().then((token) {
print("Firebase Messaging Token: $token\n");
usersRef.document(firebaseUser.uid).updateData({"FCMToken": token});
});
[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method configure on channel plugins.flutter.io/firebase_messaging)
_firebaseMessaging.configure(
onLaunch: onPush,
onResume: onPush,
onMessage: onPush,
onBackgroundMessage: Platform.isIOS ? null :onBackgroundPush,
);
}
Here my AppDelegate.swift:
import UIKit
import Flutter
import Firebase
#UIApplicationMain
#objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
if #available(iOS 10.0, *) {
UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate
}
FirebaseApp.configure()
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}
I already followed all the steps specified in the https://pub.dev/packages/firebase_messaging for IOS integration :
APNs and all... Anyone know how to solve this ?
I just found the solutions to my problem, I was getting those errors because I add flutter apns plugin in my project, which disable fcm plugins.
Removing it solve my problem.
I am trying to perform a widget test, specifically navigation test. I am using bloc architecture, setting a stream on the bloc triggers a series of events inside the bloc, gets session info from the server call (which returns a future of session info object), on successful server call a login stream is set and the widget has a stream subscription to this stream and navigates to the next screen.
I am using mockito to mock the server call and stubbing the server call to return a future of success response. The problem is the when I am calling pumpAndSettle() it is getting timed out as it is not waiting for the future to complete and return the success response.
I apologize if I am not making it very clear, but here is the sample code:
login_bloc.dart
class LoginBloc {
LoginRepository _loginRepository;
final String searchKeyword = "special-keyword";
final _urlString = PublishSubject<String>();
final _isLoggedIn = BehaviorSubject<bool>(seedValue: false);
final _errorMessage = PublishSubject<String>();
Observable<bool> get isLoggedIn => _isLoggedIn.stream;
Observable<String> get isErrorState => _errorMessage.stream;
LoginBloc({LoginRepository loginRepository})
: _loginRepository = loginRepository ?? LoginRepository() {
// Listen on the _urlString stream to call the function which checks for the special keyword and if a match is found make a server call
_urlString.stream.listen((String url) {
_authorizationFullService(url);
});
}
// Search for special keyword and if a match is found call the server call function
void _authorizationFullService(String url) {
if (url.contains(searchKeyword)) {
int index = url.indexOf(searchKeyword);
String result = url.substring(index + searchKeyword.length);
result = result.trim();
String decodedUrl = Uri.decodeFull(result);
if (decodedUrl != null && decodedUrl.length > 0) {
_fullServiceServerCall(decodedUrl);
} else {
_isLoggedIn.sink.add(false);
}
}
}
// Call server call function from repository which returns a future of the Authorization object
void _fullServiceServerCall(String decodedUrl) {
_loginRepository
.getSession(decodedUrl)
.then(_handleSuccessAuthorization)
.catchError(_handleErrorState);
}
// Handle success response and set the login stream
void _handleSuccessAuthorization(Authorization authorization) {
if (authorization != null && authorization.idnumber != 0) {
_isLoggedIn.sink.add(true);
} else {
_isLoggedIn.sink.add(false);
}
}
// Handle error response and set the error stream
void _handleErrorState(dynamic error) {
_isLoggedIn.sink.add(false);
_errorMessage.sink.add(error.toString());
}
void dispose() {
_urlString.close();
_isLoggedIn.close();
_errorMessage.close();
}
}
widget_test.dart
group('Full Login Navigation test', () {
LoginRepository mockLoginRepository;
LoginBloc loginBloc;
NotificationBloc notificationBloc;
NavigatorObserver mockNavigatorObserver;
Authorization _auth;
String testUrl;
setUp(() {
mockLoginRepository = MockLoginRepository();
_auth = Authorization((auth) => auth
..param1 = "foo"
..param2 = "bar"
..param3 = "foobar"
..param4 = "barfoo");
loginBloc = LoginBloc(loginRepository: mockLoginRepository);
mockNavigatorObserver = MockNavigatorObserver();
testUrl = "http://test.test.com";
});
Future<Null> _buildFullLoginPage(LoginBloc loginBloc,
NotificationBloc notificationBloc, WidgetTester tester) async {
when(mockLoginRepository.getSession(testUrl))
.thenAnswer((_) => Future.value(_auth));
await tester.pumpWidget(LoginBlocProvider(
child: NotificationBlocProvider(
child: MaterialApp(
home: LoginFullService(),
onGenerateRoute: NavigationRoutes.routes,
navigatorObservers: [mockNavigatorObserver],
),
notificationBloc: notificationBloc,
),
loginBloc: loginBloc,
));
//TODO: Remove casting to dynamic after dart sdk bug fix: https://github.com/dart-lang/mockito/issues/163
verify(mockNavigatorObserver.didPush(any, any) as dynamic);
loginBloc.getAuthorization(
"http://testing.testing.com?search-keyword=http%3A%2F%2Ftest.test.com");
}
testWidgets('Navigate to landing page on correct login url',
(WidgetTester tester) async {
await _buildFullLoginPage(loginBloc, notificationBloc, tester);
await tester.pumpAndSettle();
expect(find.byKey(Key('webview_scaffold')), findsNothing);
//TODO: Remove casting to dynamic after dart sdk bug fix: https://github.com/dart-lang/mockito/issues/163
verify(mockNavigatorObserver.didPush(any, any) as dynamic);
});
});
On running the widget test the tester.pumpAndSettle() inside testWidgets times out before the future is completed. This is the error log:
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following assertion was thrown running a test:
pumpAndSettle timed out
When the exception was thrown, this was the stack:
#0 WidgetTester.pumpAndSettle.<anonymous closure> (package:flutter_test/src/widget_tester.dart:299:11)
<asynchronous suspension>
#3 TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:69:41)
#4 WidgetTester.pumpAndSettle (package:flutter_test/src/widget_tester.dart:295:27)
#5 main.<anonymous closure>.<anonymous closure> (file:///Users/ssiddh/Documents/projects/mobile-flutter/test/ui/pages/login/login_full_test.dart:114:20)
<asynchronous suspension>
#6 testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:72:23)
#7 TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:555:19)
<asynchronous suspension>
#10 TestWidgetsFlutterBinding._runTest (package:flutter_test/src/binding.dart:539:14)
#11 AutomatedTestWidgetsFlutterBinding.runTest.<anonymous closure> (package:flutter_test/src/binding.dart:883:24)
#17 AutomatedTestWidgetsFlutterBinding.runTest (package:flutter_test/src/binding.dart:880:15)
#18 testWidgets.<anonymous closure> (package:flutter_test/src/widget_tester.dart:71:22)
#19 Declarer.test.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test/src/backend/declarer.dart:168:27)
<asynchronous suspension>
#20 Invoker.waitForOutstandingCallbacks.<anonymous closure> (package:test/src/backend/invoker.dart:249:15)
<asynchronous suspension>
#25 Invoker.waitForOutstandingCallbacks (package:test/src/backend/invoker.dart:246:5)
#26 Declarer.test.<anonymous closure>.<anonymous closure> (package:test/src/backend/declarer.dart:166:33)
#31 Declarer.test.<anonymous closure> (package:test/src/backend/declarer.dart:165:13)
<asynchronous suspension>
#32 Invoker._onRun.<anonymous closure>.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test/src/backend/invoker.dart:403:25)
<asynchronous suspension>
#46 _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19)
#47 _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5)
#48 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:169:12)
(elided 30 frames from class _FakeAsync, package dart:async, and package stack_trace)
I would really appreciate any kind of help or feedback.
Try wrapping your test with
testWidgets('Navigate to landing page on correct login url',
(WidgetTester tester) async {
await tester.runAsync(() async {
// test code here
});
});
After update flutter I have this error bellow, only when I erase app and release a new app. If I just hot reload I havn't this error and map is launch correctly.
I'm certain it's was after update flutter. I saved each blocs validations, and now this issue is repeatable with all previous backup, and I certain that I validate this fonction after remove and reinstall app
in libobject_patch.dart
#patch
dynamic noSuchMethod(Invocation invocation) {
// TODO(regis): Remove temp constructor identifier 'withInvocation'.
throw new NoSuchMethodError.withInvocation(this, invocation);
}
in the console
E/flutter (28250): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (28250): NoSuchMethodError: The method 'substring' was called on null.
E/flutter (28250): Receiver: null
E/flutter (28250): Tried calling: substring(1, 10)
E/flutter (28250): #0 Object.noSuchMethod (dart:core/runtime/libobject_patch.dart:46:5)
E/flutter (28250): #1 _ContentState.initState.<anonymous closure> (file:///C:/Users/utilisateur/Desktop/nirbiapp/lib/Content.dart:145:40)
E/flutter (28250): #2 _RootZone.runUnaryGuarded (dart:async/zone.dart:1316:10)
E/flutter (28250): #3 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:330:11)
E/flutter (28250): #4 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:257:7)
E/flutter (28250): #5 _ForwardingStreamSubscription._add (dart:async/stream_pipe.dart:132:11)
E/flutter (28250): #6 _MapStream._handleData (dart:async/stream_pipe.dart:232:10)
E/flutter (28250): #7 _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:164:13)
E/flutter (28250): #8 _RootZone.runUnaryGuarded (dart:async/zone.dart:1316:10)
E/flutter (28250): #9 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:330:11)
E/flutter (28250): #10 _DelayedData.perform (dart:async/stream_impl.dart:578:14)
E/flutter (28250): #11 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:694:11)
E/flutter (28250): #12 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:654:7)
E/flutter (28250): #13 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter (28250): #14 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
flutter doctor
C:\flutter\bin\flutter.bat --no-color doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel beta, v0.4.4, on Microsoft Windows [version
10.0.16299.431], locale fr-FR)
[√] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[√] Android Studio (version 3.0)
[√] VS Code, 64-bit edition (version 1.21.1)
[√] Connected devices (1 available)
• No issues found!
Process finished with exit code 0
I have this error when I place showMap here:
_loadgeoValue() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
lat = (prefs.getDouble('lat'));
long = (prefs.getDouble('long'));
});
showMap();
}
If I launch showMap(); after Onpressed Button I have no issues.
but if I do that, I don't know how to update map with lat and long variable.
Currently I launch the map when I receive sms with coordinate, for this ,
1/ I send sms with Onpressed button
2/ I read the reply with : SmsReceiver().onSmsReceived.listen((SmsMessage msg)
3/ I extract coordinate (lat long) with regex
4/ I save values with shared preference
5/ After saved, I launch mapview with the lat and long coordinate
I have replace if (msg.address == "+33$nirbinumber1") by my own number to test and to be certain of the achievement of the comparaison. Tried calling: substring(1, 10) is remove with the other lines but I have always libobject_patch.dart who is display
Here is the code with substring(1, 10)
String nirbinumber ;
loadnirbinumber() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
nirbinumber = (prefs.getString('number1'));
});
}
#override
void initState() {
super.initState();
loadnirbinumber(); //function to read programed number
new SmsReceiver().onSmsReceived.listen((SmsMessage msg) { // function to listen entry sms
var nirbinumber1= nirbinumber.substring(1, 10); //function to extract first number 0X XX XX XX XX
if (msg.address == "+33$nirbinumber1") // Action after compare input sms with programed number +33X XX XX XX XX
{
setState(() {
_lastMessage = msg;
});
RegExp regExp = new RegExp( //Here is the regex function to isolate first word of sms
r"^([\w\-]+)",
);
var match = regExp.firstMatch(_lastMessage.body);
group1 = match.group(1);
if ( group1 =="maps"){
MapView.setApiKey('AIzaSyCNYMslm35FPWYFGkJVMk7aAOd174TUCGQ');
_savegeoValue(); // this function use shared preference to save, extract, and load map
}
}
}
);
}
I replace by regex, it remove the substring error but no the noSuchMethode
new SmsReceiver().onSmsReceived.listen((SmsMessage msg) {
RegExp regExp = new RegExp(
r"^0([0-9]{9})",
);
var match = regExp.firstMatch(nirbinumber);
group1 = match.group(1);
if (msg.address == "+33$group1") {
setState(() {
_lastMessage = msg;
});
Am I possibly creating the stream and consequently the media instance incorrectly?
Modifying googleapis_examples/drive_upload_download_console, I'm attempting to convert already stored .docx, .xlsx, etc files to their corresponding Google Drive counterpart.
The following code
import 'dart:async';
import 'dart:io';
import 'package:http/http.dart' show Client;
import 'package:googleapis/common/common.dart' show Media, DownloadOptions;
import 'package:googleapis/drive/v2.dart' as drive;
import 'package:path/path.dart' as path;
Future convertFile(drive.DriveApi api,
Client client,
String objectId) {
var completer = new Completer();
api.files.get(objectId).then((drive.File file) {
var fileName = path.basenameWithoutExtension(file.title);
var parents = file.parents;
client.readBytes(file.downloadUrl).then((bytes) {
var driveFile = new drive.File()
..title = fileName
..mimeType = 'application/vnd.google-apps.document'
..parents = parents;
api.files.insert(driveFile)
.then((driveFile){
var byteList = bytes.toList();
var stream = new Stream.fromIterable(byteList);
var media = new Media(stream, byteList.length);
api.files.update(new drive.File(), driveFile.id, uploadMedia: media)
.then((drive.File f){
stream.close().whenComplete((){
api.files.delete(objectId)
.then((_){
completer.complete(true);
print("Converted ${f.id}");
});
});
});
});
});
});
return completer.future;
}
results in the following error.
Unhandled exception:
Uncaught Error: Class 'int' has no instance getter 'length'.
NoSuchMethodError: method not found: 'length'
Receiver: 80
Arguments: []
Stack Trace:
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#1 Base64Encoder.bind.onData (package:googleapis/src/common_internal.dart:325:42)
#2 _RootZone.runUnaryGuarded (dart:async/zone.dart:1093)
#3 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341)
#4 _IterablePendingEvents.handleNext (dart:async/stream_impl.dart:549)
#5 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:671)
#6 _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#7 _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#8 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
#9 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)
#0 _rootHandleUncaughtError.<anonymous closure> (dart:async/zone.dart:886)
#1 _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#2 _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#3 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
#4 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)
The Media constructor expects a Stream<List<int>>, and your code is providing a Stream<int>. To solve this, just replace this line:
var stream = new Stream.fromIterable(byteList);
by:
var stream = new Stream.fromIterable([byteList]);