How to assign custom colors to a map in Flutter without type mismatch errors?

Question

I'm developing a Flutter application in Android Studio and facing a challenge with customizing color assignments. My goal is to assign specific colors to different statuses in my app. For some statuses, using predefined Colors works fine, such as Colors.grey for PomodoroStatus.runningPomodoro. However, when I attempt to assign custom colors, I encounter type mismatch errors stating "The element type 'Color' can't be assigned to the map value type 'MaterialColor'".

Here's a bit of context: I'm implementing a feature that changes the UI color based on the current status of a Pomodoro timer. The timer has several statuses, like running, paused, and types of breaks. I've created a map to associate each status with a corresponding color.

Code:

import 'package:flutter/material.dart';
import '../model/pomodoro_status.dart';
import 'package:flutter/cupertino.dart';

const pomodoroTotalTime = 240 * 60;
const shortBreakTime = 20 * 60;
const lonBreakTime = 60 * 60;
const pomodoroPerSet = 4;

const Map<PomodoroStatus, String> statusDescription = {
  PomodoroStatus.runningPomodoro: 'Pomodoro is running, try to be focused',
  // Other status descriptions...
};

const Map<PomodoroStatus, MaterialColor> statusColor = {
  PomodoroStatus.runningPomodoro: Colors.grey, // Works fine
  // Custom color assignments below lead to errors
  PomodoroStatus.pausedPomodoro: const Color(0xFFC2C2C2),
  // Other status colors...
};

I've already tried consulting the Flutter documentation and searching for similar issues here, but couldn't find a scenario that matches mine exactly. Most solutions I found were related to using Colors directly, not custom Color values.

Questions:

1. How can I correctly assign custom Color values to my map without encountering type mismatch errors?
2. Is there a specific way to cast or convert Color objects to MaterialColor to fit the map's expected value type?

Any guidance or references to relevant documentation would be greatly appreciated.

Answer 1

Your statusColor map has MaterialColor as a value, so it will only accept colors within the Colors class.