im using this package image_downloader 0.31.0 i already look for the example to use this but i always got this error, don't know why
error results
E/flutter (28894): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: MissingPluginException(No implementation found for method downloadImage on channel plugins.ko2ic.com/image_downloader)
E/flutter (28894): #0 MethodChannel._invokeMethod
package:flutter/…/services/platform_channel.dart:165
E/flutter (28894): <asynchronous suspension>
E/flutter (28894): #1 ImageDownloader.downloadImage (package:image_downloader/image_downloader.dart:31:12)
E/flutter (28894): <asynchronous suspension>
E/flutter (28894): #2 _SurveyTicketState.openQrLink
package:onesmile/…/survey/survey_ticket.dart:45
E/flutter (28894): <asynchronous suspension>
E/flutter (28894):
this is my code
downloadImage() async {
var url = 'https://images.unsplash.com/photo-1644982647970-e72b0397e57b?ixlib=rb-1.2.1&raw_url=true&q=80&fm=jpg&crop=entropy&cs=tinysrgb&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=435';
try {
var imageId = await ImageDownloader.downloadImage(url);
if (imageId == null) {
return;
}
var path = await ImageDownloader.findPath(imageId);
} on PlatformException catch (error) {
print('======== $error');
}
}
Related
I need help.
I'm trying to extract files from an archive.
var byteData = await rootBundle.load('assets/res.zip');
var buffer = byteData.buffer;
var archive = ZipDecoder().decodeBytes(buffer.asUint8List(),
verify: true, password: '123');
for (final file in archive) {
final filename = file.name;
if (file.isFile) {
final data = file.content as List<int>;
File('$tempPath/files/$filename')
..createSync(recursive: true)
..writeAsBytesSync(data);
} else {
Directory('$tempPath/files/$filename').create(recursive: true);
}
}
But I'm getting this error..................
E/flutter ( 8813): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Unsupported operation: Cannot modify an unmodifiable list
E/flutter ( 8813): #0 _UnmodifiableUint8ArrayView.[]= (dart:typed_data-patch/typed_data_patch.dart:5391:5)
E/flutter ( 8813): #1 ZipFile._decodeZipCrypto (package:archive/src/zip/zip_file.dart:192:12)
E/flutter ( 8813): #2 ZipFile.content (package:archive/src/zip/zip_file.dart:129:27)
E/flutter ( 8813): #3 ZipDecoder.decodeBuffer (package:archive/src/zip_decoder.dart:32:41)
E/flutter ( 8813): #4 ZipDecoder.decodeBytes (package:archive/src/zip_decoder.dart:16:12)
E/flutter ( 8813): #5 _HomePageState.dataWriteToLocal (package:mytest/Pages/home_page.dart:417:36)
E/flutter ( 8813): <asynchronous suspension>
I have a simple function to request Permission for Firebase Messaging
Future requestPermissionFCM() async {
final FirebaseMessaging messaging = FirebaseMessaging.instance;
final NotificationSettings settings = await messaging.requestPermission();
if (settings.authorizationStatus == AuthorizationStatus.authorized) {
print('User granted permision');
} else if (settings.authorizationStatus == AuthorizationStatus.provisional) {
print('User granted provisional permission');
} else {
print('user declined or has not accepted permission');
}
}
I call in during initState in main.dart
and exactly this line
final NotificationSettings settings = await messaging.requestPermission();
causes the Unhandled Exception
E/flutter (11771): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [firebase_messaging/unknown] Attempt to invoke virtual method 'java.lang.Object android.content.Context.getSystemService(java.lang.String)' on a null object reference
E/flutter (11771): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:653:7)
E/flutter (11771): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:315:18)
E/flutter (11771): <asynchronous suspension>
E/flutter (11771): #2 MethodChannel.invokeMapMethod (package:flutter/src/services/platform_channel.dart:518:43)
E/flutter (11771): <asynchronous suspension>
E/flutter (11771): #3 MethodChannelFirebaseMessaging.requestPermission (package:firebase_messaging_platform_interface/src/method_channel/method_channel_messaging.dart:271:36)
E/flutter (11771): <asynchronous suspension>
E/flutter (11771): #4 requestPermissionFCM (package:dev/services/fcm_services.dart:30:41)
E/flutter (11771): <asynchronous suspension>
Despite this exception, the app does not crush and messaging works as it should be including background push notifications. So what can it be?
Getting a weird error while using signInWithCredential(), but I am able to sign in by signInAnonymously()
Have tried searching and remaking app in facebookDeveloper account.
My Function:
Future<UserCredential> _signInWithFacebook() async {
final loginResult = await FacebookAuth.instance.login(permissions: [
'email',
'public_profile',
]);
if (loginResult.status == LoginStatus.success) {
final accessToken = loginResult.accessToken!.token;
final OAuthCredential credential =
FacebookAuthProvider.credential(accessToken);
return await FirebaseAuth.instance
.signInWithCredential(credential)
.then((value) {
Navigator.pushReplacementNamed(context, '/home');
return value;
});
} else {
return FirebaseAuth.instance.signInAnonymously();
}
}
Error:
FLTFirebaseAuth: An error occurred while calling method Auth#signInWithCredential, errorOrNil => (null)
[VERBOSE-2:ui_dart_state.cc(198)] Unhandled Exception: [firebase_auth/unknown] An unknown error has occurred.
#0 StandardMethodCodec.decodeEnvelope
package:flutter/…/services/message_codecs.dart:607
#1 MethodChannel._invokeMethod
package:flutter/…/services/platform_channel.dart:167
<asynchronous suspension>
#2 MethodChannel.invokeMapMethod
package:flutter/…/services/platform_channel.dart:367
<asynchronous suspension>
#3 MethodChannelFirebaseAuth.signInWithCredential
package:firebase_auth_platform_interface/…/method_channel/method_channel_firebase_auth.dart:433
<asynchronous suspension>
#4 FirebaseAuth.signInWithCredential
package:firebase_auth/src/firebase_auth.dart:497
<asynchronous suspension>
The following steps can be helpful if you haven't tried it yet -
Check if the firebase app is instantiated at the beginning -> .initializeApp()
Firebase Auth doesn't work without initialization
If the above two doesn't work, replace google-services.json with a new one. Do a clean build
I'm studying flutter with Sqflite and trying to make a small app, but I'm getting this error when I run the code, I've looked literaly everywhere to findout what it could be.
Here the code code who use the Sqflite package:
Future<Database> getDatabase() async {
final String path = join(await getDatabasesPath(), 'bytebank.db');
return openDatabase(path, onCreate: (db, version) {
db.execute('CREATE TABLE contacts'
'(id INTEGER PRIMARY KEY, '
'name TEXT, '
'account_number INTEGER)');
}, version: 1);
}
Future<int> save(Contact contact) async {
final Database db = await getDatabase();
final Map<String, dynamic> contactMap = Map();
contactMap['name'] = contact.name;
contactMap['account_number'] = contact.account;
contactMap['id'] = contact.id;
return db.insert('contacts', contactMap);
}
Future<List<Contact>> findAll() async {
final Database db = await getDatabase();
final List<Map<String, dynamic>> result = await db.query('contacts');
final List<Contact> contacts = [];
for (Map<String, dynamic> row in result) {
final Contact contact = Contact(
row['id'],
row['name'],
row['account_number'],
);
contacts.add(contact);
}
return contacts;
}
And here is the only one place where I use This functions:
void main() {
save(Contact('William', 2, 13456)).then((id) {
findAll().then((contacts) => print(contacts));
});
runApp(ByteBankApp());
}
Model Class:
class Contact {
final String name;
final int account;
final int id;
Contact( this.id,
this.name,
this.account,
);
#override
String toString() {
return 'Contact{name: $name, account: $account}';
}
}
Error Trace back:
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.
Installing build\app\outputs\flutter-apk\app.apk...
Debug service listening on ws://127.0.0.1:52296/07rtnvW9tlQ=/ws
Syncing files to device sdk gphone x86 arm...
E/flutter (28649): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: Null check operator used on a null value
E/flutter (28649): #0 MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:142:86)
E/flutter (28649): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:148:36)
E/flutter (28649): #2 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:331:12)
E/flutter (28649): #3 invokeMethod (package:sqflite/src/sqflite_impl.dart:17:13)
E/flutter (28649): #4 SqfliteDatabaseFactoryImpl.invokeMethod (package:sqflite/src/factory_impl.dart:82:7)
E/flutter (28649): #5 SqfliteDatabaseFactoryMixin.safeInvokeMethod.<anonymous closure> (package:sqflite_common/src/factory_mixin.dart:41:38)
E/flutter (28649): #6 wrapDatabaseException (package:sqflite/src/exception_impl.dart:7:32)
E/flutter (28649): #7 SqfliteDatabaseFactoryImpl.wrapDatabaseException (package:sqflite/src/factory_impl.dart:78:7)
E/flutter (28649): #8 SqfliteDatabaseFactoryMixin.safeInvokeMethod (package:sqflite_common/src/factory_mixin.dart:41:7)
E/flutter (28649): #9 SqfliteDatabaseFactoryMixin.getDatabasesPath (package:sqflite_common/src/factory_mixin.dart:153:26)
E/flutter (28649): #10 getDatabasesPath (package:sqflite/sqflite.dart:161:54)
E/flutter (28649): #11 getDatabase (package:bytebank/database/app_database.dart:6:34)
E/flutter (28649): #12 save (package:bytebank/database/app_database.dart:16:29)
E/flutter (28649): #13 main (package:bytebank/main.dart:7:3)
E/flutter (28649): #14 _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:142:25)
E/flutter (28649): #15 _rootRun (dart:async/zone.dart:1354:13)
E/flutter (28649): #16 _CustomZone.run (dart:async/zone.dart:1258:19)
E/flutter (28649): #17 _runZoned (dart:async/zone.dart:1789:10)
E/flutter (28649): #18 runZonedGuarded (dart:async/zone.dart:1777:12)
E/flutter (28649): #19 _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:138:5)
E/flutter (28649): #20 _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:283:19)
E/flutter (28649): #21 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
E/flutter (28649):
I am not sure if will help, but I was running into a similar issue when initializing a database in an async "main" method. Adding the following:
WidgetsFlutterBinding.ensureInitialized();
inside the method before the code initializing the database solved the problem.
I upgraded the flutter sdk by flutter upgrade --force. The project was working fine before upgrade but I am getting error after upgrade. I am currently working in lastest stable version of flutter.
E/flutter (17687): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: NoSuchMethodError: The method 'call' was called on null.
E/flutter (17687): Receiver: null
E/flutter (17687): Tried calling: call()
E/flutter (17687): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
E/flutter (17687): #1 BasicLock.synchronized (package:synchronized/src/basic_lock.dart:31:24)
E/flutter (17687): #2 SembastDatabase.flush (package:sembast/src/database_impl.dart:593:27)
E/flutter (17687): #3 SembastDatabase.open (package:sembast/src/database_impl.dart:879:11)
E/flutter (17687): <asynchronous suspension>
E/flutter (17687): #4 DatabaseOpenHelper.openDatabase.<anonymous closure> (package:sembast/src/database_factory_mixin.dart:80:7)
E/flutter (17687): <asynchronous suspension>
E/flutter (17687): #5 BasicLock.synchronized (package:synchronized/src/basic_lock.dart:33:16)
E/flutter (17687): <asynchronous suspension>
E/flutter (17687): #6 DaoDatabase._openDatabase (package:kitabyatra/db/DaoDatabase.dart:43:26)
E/flutter (17687): <asynchronous suspension>
I have implemented as follows:
class DaoDatabase {
DaoDatabase();
static final DaoDatabase _singleton = DaoDatabase();
static DaoDatabase get instance => _singleton;
Completer<Database> _dbOpenCompleter;
Future<Database> get database async {
if (_dbOpenCompleter == null) {
_dbOpenCompleter = Completer<Database>();
_openDatabase();
}
return _dbOpenCompleter.future;
}
Future<dynamic> _openDatabase() async {
final Directory appDocumentDir = await getApplicationDocumentsDirectory();
final String dbPath = join(appDocumentDir.path, Strings.appDbName);
final Database database = await databaseFactoryIo.openDatabase(dbPath); //--> Getting error here
_dbOpenCompleter.complete(database);
}
}