Which code should I use to provide the ID to another StatelessWidget?

I want to give the ID to another StatelessWidget. But, there is two way for me to choose. The first way is to use the model’s ID. The data for this model comes from a Firebase Cloud Firestore document and I use the original ID as the document id. The second way is to use… Read More Which code should I use to provide the ID to another StatelessWidget?

Can't figure out this Error "The method 'map' can't be unconditionally invoked because the receiver can be 'null'"

I’m following this speed code tutorial(https://www.youtube.com/watch?v=KO_PYJKHglo) and I’m facing some problems during somewhere on 5:08 import ‘package:flutter/material.dart’; import ‘dart:math’; class WaveColorPainter extends CustomPainter { Paint? _paint; List<Color>? colors; @override void paint(Canvas canvas, Size size) { colors = List.from(Colors.accents); colors!.removeRange(6, 13); //null safety List<Color> gradColors = colors.map( (color) => color.withOpacity( Random().nextDouble().clamp(0.5, 0.9), ), ); final Gradient… Read More Can't figure out this Error "The method 'map' can't be unconditionally invoked because the receiver can be 'null'"

Inserting List of strings as list of objects

I need to add items to a Appointment item. Appointment is a class as follows: Appointment Appointment({ String? startTimeZone, String? endTimeZone, String? recurrenceRule, bool isAllDay = false, String? notes, String? location, List<Object>? resourceIds, Object? recurrenceId, Object? id, required DateTime startTime, required DateTime endTime, String subject = ”, Color color = Colors.lightBlue, List<DateTime>? recurrenceExceptionDates, }) I… Read More Inserting List of strings as list of objects

Why am I getting dart:html not found?

I am trying to make a quiz app and the app is running perfectly but there is this passive error lib/main.dart:4:8: Error: Not found: ‘dart:html’ import ‘dart:html’; Here is my code import ‘package:flutter/material.dart’; import ‘dart:html’; void main() { runApp(QuizApp()); } List questionBank = […]; class QuizApp extends StatefulWidget { @override State<QuizApp> createState() => _MyAppState(); }… Read More Why am I getting dart:html not found?

This code returns an error that says 'Unexpected Null Value'

Here is my code class FakturPage extends StatefulWidget { const FakturPage({Key? key}) : super(key: key); static String id = ‘fakturpage’; @override State<FakturPage> createState() => _FakturPageState(); } class _FakturPageState extends State<FakturPage> { @override Widget build(BuildContext context) { return Scaffold( body: Column( children: [ DropdownTextfield(), ], ), ); } } and this is the DropdownTextfield widget code,… Read More This code returns an error that says 'Unexpected Null Value'