The Flutter Rating Bar is a simple yet fully customizable rating bar for Flutter applications, allowing you to incorporate a rating system easily. Whether you are building an app that requires user feedback or one that involves scoring, the Flutter Rating Bar has you covered. In this article, we will explore its salient features and how to implement it effectively.

Salient Features

• Set minimum and maximum rating
• Use any widget as rating bar indicator items
• Use different widgets in the same rating bar based on position
• Supports vertical layout
• Glows on interaction for better user experience
• Supports RTL (Right to Left) mode

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Usage

The Flutter Rating Bar can be implemented in three different ways. Let’s dive into each method.

First Way: Using RatingBar.builder()

This method allows you to create a customizable rating bar with a builder function.

RatingBar.builder(
    initialRating: 3,
    minRating: 1,
    direction: Axis.horizontal,
    allowHalfRating: true,
    itemCount: 5,
    itemPadding: EdgeInsets.symmetric(horizontal: 4.0),
    itemBuilder: (context, _) => Icon(
        Icons.star,
        color: Colors.amber,
    ),
    onRatingUpdate: (rating) => print(rating),
);

Second Way: Using RatingBar()

This method gives you a more declarative approach to create the rating bar.

RatingBar(
    initialRating: 3,
    direction: Axis.horizontal,
    allowHalfRating: true,
    itemCount: 5,
    ratingWidget: RatingWidget(
        full: _image('assets/heart.png'),
        half: _image('assets/heart_half.png'),
        empty: _image('assets/heart_border.png'),
    ),
    itemPadding: EdgeInsets.symmetric(horizontal: 4.0),
    onRatingUpdate: (rating) => print(rating),
);

Heart icons are available here.

Third Way: Using RatingBar.builder() with Index

In this method, you can define the icons based on their index in the rating bar.

RatingBar.builder(
    initialRating: 3,
    itemCount: 5,
    itemBuilder: (context, index) {
        switch (index) {
            case 0: return Icon(Icons.sentiment_very_dissatisfied, color: Colors.red);
            case 1: return Icon(Icons.sentiment_dissatisfied, color: Colors.redAccent);
            case 2: return Icon(Icons.sentiment_neutral, color: Colors.amber);
            case 3: return Icon(Icons.sentiment_satisfied, color: Colors.lightGreen);
            case 4: return Icon(Icons.sentiment_very_satisfied, color: Colors.green);
        }
    },
    onRatingUpdate: (rating) => print(rating),
);

Using Flutter Rating Bar Indicator

If you would like to display a rating instead of collecting one, you can use the Rating Bar Indicator:

RatingBarIndicator(
    rating: 2.75,
    itemBuilder: (context, index) => Icon(
        Icons.star,
        color: Colors.amber,
    ),
    itemCount: 5,
    itemSize: 50.0,
    direction: Axis.vertical,
);

Vertical Mode

To make the indicator scrollable, use the physics property as shown in the example.

Troubleshooting Ideas

If you encounter issues while implementing the Flutter Rating Bar, consider the following troubleshooting steps:

• Check for compatibility issues with the latest Flutter version.
• Ensure you have added the correct dependencies in your pubspec.yaml file.
• Follow the documentation on the API docs for detailed information.
• Review any error messages in your console for clues.
• Feel free to report issues or request missing features in the GitHub repo.

For more insights, updates, or to collaborate on AI development projects, stay connected with fxis.ai.

Conclusion

At fxis.ai, we believe that such advancements are crucial for the future of AI, as they enable more comprehensive and effective solutions. Our team is continually exploring new methodologies to push the envelope in artificial intelligence, ensuring that our clients benefit from the latest technological innovations.