dart

[Solved] Error: Too few positional arguments: 1 required, 0 given

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You don’t need to specify the parameter label for BottomTabBtn. Instead of: BottomTabBtn(imagePath: “assets/images/tab_home.png”), Use: BottomTabBtn(“assets/images/tab_home.png”), If you really want to use parameter label, then change your constructor declaration to: BottomTabBtn({this.imagePath}); 1 solved Error: Too few positional arguments: 1 required, 0 given

[Solved] i am getting Error: Not found: ‘dart:html’

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As described on the front-page of the API documentation for Dart: https://api.dart.dev dart:html: DOM manipulation for web apps (available only to web apps). dart:io: I/O for non-web apps. So dart:html can only be used if your target platform is web (so Dart code compiled to JavaScript). In your case, you are trying to make an … Read more

[Solved] how to disable linter in flutter?

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The Flutter linter is a tool that scans your code for potential problems and makes recommendations for fixes. Generally speaking, it’s a good practice to have the linter active because it can aid in error detection and better code maintenance. However, if you want to disable the linter for some reason, you can do so … Read more

[Solved] what should I do flutter. _TypeError (type ‘String’ is not a subtype of type ‘int’ of ‘index’) [closed]

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This type mismatch error which means that you provide “String value ” but needs of integer type value for more information you refere this link Type ‘String’ is not a subtype of type ‘int’ of ‘index’ solved what should I do flutter. _TypeError (type ‘String’ is not a subtype of type ‘int’ of ‘index’) [closed]

[Solved] How to get specific document data from firebase and return as a string

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It works for me Widget build(BuildContext context) { return new StreamBuilder( stream: Firestore.instance.collection(‘COLLECTION_NAME’).document(‘TEST’).snapshots(), builder: (context, snapshot) { if (!snapshot.hasData) { return Center(child: CircularProgressIndicator()); } var userDocument = snapshot.data; return new Text(userDocument[“property_name”]); } ); } 1 solved How to get specific document data from firebase and return as a string

[Solved] A value of type ‘Null’ can’t be assigned to a parameter of type ‘Key’ in a const constructor. Try using a subtype, or removing the keyword ‘const’

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A value of type ‘Null’ can’t be assigned to a parameter of type ‘Key’ in a const constructor. Try using a subtype, or removing the keyword ‘const’ solved A value of type ‘Null’ can’t be assigned to a parameter of type ‘Key’ in a const constructor. Try using a subtype, or removing the keyword ‘const’

[Solved] The iPhone app closes immediately when I open the map [closed]

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You need to add the google map API key on ios/Runner/AppDelegate.swift file import UIKit import Flutter import GoogleMaps @UIApplicationMain @objc class AppDelegate: FlutterAppDelegate { override func application( _ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? ) -> Bool { GMSServices.provideAPIKey(“GOOGLE_API_KEY”) GeneratedPluginRegistrant.register(with: self) return super.application(application, didFinishLaunchingWithOptions: launchOptions) } } 2 solved The iPhone app closes immediately when … Read more

[Solved] Why does the code execute without waiting for await to return in dart/flutter?

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Taking a closer look at your Firebase function, I was able to identify two issues: Usage of both await and then keywords in the same function. These two statements do the same thing. Quoting this accepted answer. await is just an internal version of .then() (doing basically the same thing). The reason to choose one … Read more

[Solved] How to convert JSON to object in Flutter? [closed]

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Maybe, this website is what you’re looking for: https://javiercbk.github.io/json_to_dart/ You simply paste your json (usually the response coming from an API) and it creates a class in dart for that json. so then, you can use it like: MyJsonClass classResponse = MyJsonClass.fromJson(apiResponse); And access its parameters like this: print(classResponse.mon.a) // output: 3 generated code used: … Read more

[Solved] Flutter – Is there any way to change variable value without using setState() or notifyListeners()

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use stream.it is like a pipe you add value from a side (Sink) and recieve it on the other side (Stream).i will try to explain it: //make a stream controller StreamController<bool> valueController = StreamController(); //this will listen to every new value you add Stream valueOutput = valueController.stream; //you can add new values throw the sink … Read more

[Solved] how is dart compiled into javascript? [closed]

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There is quite a bit of code included that emulates features Dart provides, but that can’t be translated directly to ES5, (like classes, mixins, …). There is also quite some code included that polyfills missing browser features to make the same Dart code work in all browsers like for example jQuery does. This code could … Read more