How to implement Star Rating in Flutter

Last updated on February 16, 2022 A Goodman Loading... Post a comment

Most mobile applications and websites about e-commerce, ride-hailing, e-learning services, etc., have a function that allows users to rate products or services with the highest rating of 5 stars. or 10 stars. This tutorial shows you how to easily add a star rating feature to your Flutter application by using a plugin named flutter_rating_bar.

The Complete Example

Preview

The app we are going to make contains a star rating bar and a red circle. Users can rate one of our products on a scale from 0 stars to 5 stars. Odd steps like 0.5 stars, 1.5 stars are possible. The results will be reflected visually on the rating bar and displayed as a number in the red circle.

Install the Plugin

1. Add flutter_rating_bar and its latest version to the dependencies section in your pubspec.yaml file by performing this:

flutter pub add flutter_rating_bar

2. Run the following command to make sure the plugin is pulled to your project:

flutter pub get

3. Import it into your Dart code:

import 'package:flutter_rating_bar/flutter_rating_bar.dart';

Writing Dart Code

Star rating bar code:

 RatingBar(
                    initialRating: 0,
                    direction: Axis.horizontal,
                    allowHalfRating: true,
                    itemCount: 5,
                    ratingWidget: RatingWidget(
                        full: const Icon(Icons.star, color: Colors.orange),
                        half: const Icon(
                          Icons.star_half,
                          color: Colors.orange,
                        ),
                        empty: const Icon(
                          Icons.star_outline,
                          color: Colors.orange,
                        )),
                    onRatingUpdate: (value) {
                      setState(() {
                        _ratingValue = value;
                      });
}),

Full source code:

// main.dart
import 'package:flutter/material.dart';
import 'package:flutter_rating_bar/flutter_rating_bar.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      // Hide the debug banner
      debugShowCheckedModeBanner: false,
      title: 'Kindacode.com',
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  double? _ratingValue;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Kindacode.com'),
        ),
        body: Padding(
          padding: const EdgeInsets.all(25),
          child: Center(
            child: Column(
              children: [
                const Text(
                  'Rate our fictinal prodcut?',
                  style: TextStyle(fontSize: 24),
                ),
                const SizedBox(height: 25),
                // implement the rating bar
                RatingBar(
                    initialRating: 0,
                    direction: Axis.horizontal,
                    allowHalfRating: true,
                    itemCount: 5,
                    ratingWidget: RatingWidget(
                        full: const Icon(Icons.star, color: Colors.orange),
                        half: const Icon(
                          Icons.star_half,
                          color: Colors.orange,
                        ),
                        empty: const Icon(
                          Icons.star_outline,
                          color: Colors.orange,
                        )),
                    onRatingUpdate: (value) {
                      setState(() {
                        _ratingValue = value;
                      });
                    }),
                const SizedBox(height: 25),
                // Display the rate in number
                Container(
                  width: 200,
                  height: 200,
                  decoration: const BoxDecoration(
                      color: Colors.red, shape: BoxShape.circle),
                  alignment: Alignment.center,
                  child: Text(
                    _ratingValue != null ? _ratingValue.toString() : 'Rate it!',
                    style: const TextStyle(color: Colors.white, fontSize: 30),
                  ),
                )
              ],
            ),
          ),
        ));
  }
}

Alternatives

Besides flutter_rating_bar, there are some other good plugins for your purpose:

Conclusion

We’ve explored some good plugins to add the star rating feature to our app and examined a complete example that makes use of one of them. If you’d like to learn more new and amazing things about Flutter, take a look at the following articles:

You can also check out our Flutter category page or Dart category page for the latest tutorials and examples.

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