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How to Use Hash Hexadecimal Color Code in flutter ?
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Flutter provides color class to use only integer value and RGB value but to use hash hexadecimal color code in flutter we need to add extra efforts so that we can use hash based hexadecimal string in flutter. Hexadecimal colors are those colors which starts with # char.

Flutter Color class creates color using the integer and we can create hash based color for black as follow

const Color(0xff000000); //#000000
const Color(0xff7f1c1c); //#7f1c1c

Creating by this above method can be difficult every time. So in this article we will also learn to use simple way to use Hash Hexadecimal Color Code in flutter with two other ways too. One is using the extension and other one is using the class by extending the base color class.

Method 2: Using the Extended Class to Use Hash Hexadecimal Color Code

In this method we will use a class and extend the base color class as follow

class HexColor extends Color {
  static int _getColorFromHex(String hexColor) {
    hexColor = hexColor.toUpperCase().replaceAll("#", "");
    if (hexColor.length == 6) {
      hexColor = "FF" + hexColor;
    }
    return int.parse(hexColor, radix: 16);
  }
  HexColor(final String hexColor) : super(_getColorFromHex(hexColor));
}

Now we can use it as below simply

Color color = HexColor("#7f1c1c");

Let’s understand hash hexadecimal color code in flutter with example

Step 1 : Create flutter project

Very first step is to create the fluter application using command line tool or in Android studio.

flutter create example_app

This will create a new project with name my_app then go in to the folder .

Step 2 : Create a class and extend color class

Next step is create the new class and extend the color class 

import 'package:flutter/material.dart';

class HexColor extends Color {
  static int _getColorFromHex(String hexColor) {
    hexColor = hexColor.toUpperCase().replaceAll("#", "");
    if (hexColor.length == 6) {
      hexColor = "FF" + hexColor;
    }
    return int.parse(hexColor, radix: 16);
  }
  HexColor(final String hexColor) : super(_getColorFromHex(hexColor));
}

Step 3 : Create a simple widget

Now, Create a simple stateless widget to add the color to container and any widget. So for this we will create a stateless widget named as RedContainer

File : lib/RedContainer.dart

import 'package:example_app/classes/HexColor.dart';
import 'package:flutter/material.dart';

class RedContainer extends StatelessWidget {
  const RedContainer({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
        title: 'Flutter Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: Scaffold(
          appBar: AppBar(
            title: const Text('Checkbox Example '),
          ),
          body: Center(
              child: Container(
                padding: EdgeInsets.all(10),
                color: HexColor("#000000"),
                child: Text(
                  "Simple Hash Color",
                  style: TextStyle(color: HexColor("#CB4335")),
                ),
              )),
        ));
  }
}

Step 4: Import and use the widget in main

We just created a new widget with name RedContainer, now we are going to use it in our main.dart file as below

import 'package:flutter/material.dart'; 
import 'package:example_app/RedContainer.dart';;

void main() {
  runApp(const RedContainer());
}

Step 5: Run the project

Simply run the project using command line or in android studio to check the implementation.

flutter run lib/main.dart

Live Preview and code:

Also Read : How to Create Checkbox in Flutter?

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