CODEWITHSUNDEEP
flutterdart
Abdessamad Jadid
Abdessamad Jadid

Reputation: 401

A value of type 'Color' can't be assigned to a variable of type 'String'

i got an error while using Colors.black property from the material.dart library.

Error : A value of type 'Color' can't be assigned to a variable of type 'String'. Try changing the type of the variable, or casting the right-hand type to 'String'.

import 'package:flutter/material.dart';

class Category {
  final String id;
  final String title;
  final String color;

  const Category({
    @required this.id, 
    @required this.title, 
    this.color = Colors.black,
    });
}

enter image description here

any help will be appreciated

Upvotes: 1

Views: 9472

Answers (3)

pedro pimont
pedro pimont

Reputation: 3084

You're trying to assign a type Color to a Variable of type String, change:

final String color;

for:

final Color color;

Dart is a strongly-typed language, it prohibits you from assigning a value of another type to a variable that had it's type declared. Both Color and String are Objects in Dart, but have different types.

When you're not sure about the type you'll be passing to a variable, declare it with the keyword var:

var color;

This way you can assign any type to it. Thou it's not advised, since this way you won't be enjoying the benefits you gain from using a strongly-typed language such as Dart.

Upvotes: 6

user13857066
user13857066

Reputation:

you can make color's type

final Color color ; or final int color;

Upvotes: 1

Dave Wood
Dave Wood

Reputation: 13343

final String color;

Declares a variable called color of type String.

this.color = Colors.black

Is assigning an object of type Color to the String variable.

Change final String color to final Color color.

Upvotes: 2

Related Questions