What’s new in Flutter 3.22: let’s discuss the top 10 new things

Flutter 3.22 Release includes Web Assembly, Vulkan Graphics, Widget State Enhancements, and much more

Shirsh Shukla
7 min readMay 15, 2024

In this article, we will explore the Flutter 3.22 — What’s New In Flutter. In Flutter 3.22 introduce WebAssembly support for improved web app performance and a Vulkan backend for smoother graphics on Android. It enhances widget state management with Widget State Properties, improves UI adaptability with Dynamic View Sizing, and strengthens user input handling with Improved Form Validation.

Flavor-Conditional Asset Bundling allows selective asset bundling based on app flavors, while Gradle Kotlin DSL Support enhances code editing. Platform View Performance on iOS is significantly better, especially for scrolling. The Vertex AI for Firebase Dart SDK Preview enables building AI features, and Google Mobile Ads SDK 5.0.1 offers enhanced support for UMP SDK and more mediation partners. These updates collectively aim to enhance app performance, user experience, and developer productivity in Flutter.

So,here are the top 10 updates from the Flutter 3.22 release:

WebAssembly Support: Improved web app performance.

Vulkan Backend for Impeller: Better graphics and performance on Android.

Widget State Properties: Easier widget state management.

Dynamic View Sizing: Improved responsiveness for layouts.

Improved Form Validation: Enhanced user input handling.

Flavor-Conditional Asset Bundling: Selective asset bundling for different app flavors.

Gradle Kotlin DSL Support: Better Gradle build script editing.

Platform View Performance Improvements (iOS): Smoother platform views on iOS.

Vertex AI for Firebase Dart SDK Preview: AI features for Dart and Flutter apps.

Google Mobile Ads SDK 5.0.1: Enhanced ad monetization features.

1. WebAssembly Support

WebAssembly (Wasm) support in Flutter 3.22 is a major advancement for web app development. Wasm enables Flutter web apps to run at near-native speeds by compiling code into a binary format that browsers can execute efficiently.

This results in significantly improved performance compared to traditional web technologies. Additionally, Wasm is widely supported across major browsers, ensuring broad compatibility for Flutter web apps. By leveraging Wasm, Flutter reduces code size, leading to faster load times and better overall performance. Moreover, Wasm is a rapidly evolving technology, promising further enhancements in the future.

Overall, Wasm support in Flutter 3.22 enhances the platform’s capabilities for web development, offering developers a powerful and efficient tool for building high-performance web applications.

2. Vulkan Backend for Impeller

The Vulkan backend for Impeller in Flutter 3.22 is a significant enhancement to the rendering engine used by Flutter apps on Android. Vulkan is a low-overhead, cross-platform 3D graphics and computing API that provides high-efficiency, cross-platform access to modern GPUs.

By integrating Vulkan into Impeller, Flutter can take advantage of Vulkan’s capabilities to render graphics more efficiently, resulting in smoother graphics and improved performance in Flutter apps on Android devices. This enhancement is particularly beneficial for apps with animations and rich transitions, as it helps maintain a smooth frame rate and improves overall user experience.

3. Widget State Properties

Widget State Properties in Flutter 3.22 are about how widgets keep track of their appearance and behavior. Flutter has a special way to manage this called “MaterialState.” In this update, MaterialState has been renamed to “WidgetState” and can now be used by more parts of Flutter.

This change makes it easier for developers to control how their widgets look and behave, which is important for making Flutter apps that work well and look good.

4. Dynamic View Sizing

Dynamic view sizing in Flutter 3.22 is a feature that enhances the framework’s ability to handle responsive layouts. It introduces improvements that allow widgets to adapt their sizes based on available screen space. This is particularly useful for creating user interfaces that look consistent and appealing across a wide range of devices, from small smartphones to large tablets.

Before this update, developers often had to manually calculate and set the sizes of widgets to ensure they displayed correctly on different screen sizes. With dynamic view sizing, developers can use features like `Expanded`, `Flexible`, and `MediaQuery` to create layouts that adjust dynamically based on the screen’s dimensions.

For example, a widget wrapped in an `Expanded` or `Flexible` container can automatically expand or shrink to fill the available space, making it easier to create responsive designs. Similarly, the `MediaQuery` class allows developers to query the current screen size and adjust widget sizes accordingly.

Overall, dynamic view sizing simplifies the process of creating responsive Flutter layouts, resulting in apps that provide a consistent user experience across various devices and screen sizes.

5. Improved Form Validation

Improved form validation in Flutter 3.22 introduces more flexible and robust methods for handling user input. These enhancements offer developers greater control over how they validate user input, allowing for the implementation of custom validation logic tailored to specific application needs.

This improved validation capability leads to a more user-friendly experience, as it enables apps to provide more accurate feedback to users when they enter invalid data.

Additionally, these enhancements contribute to increased security by helping to prevent security vulnerabilities such as injection attacks. Overall, the improved form validation in Flutter 3.22 enhances the usability, security, and flexibility of Flutter apps, providing developers with powerful tools for creating more robust and user-friendly applications.

6. Flavor-Conditional Asset Bundling

Flavor-Conditional Asset Bundling in Flutter 3.22 is a feature that enhances developers’ ability to manage assets effectively across different versions or “flavors” of their apps. With this feature, developers can specify which assets (such as images, fonts, or configuration files) should be included in the app bundle based on the app’s flavor.

This means that assets specific to a particular version of the app, such as branding assets or configuration files, can be included without affecting other versions of the app.

By organizing assets in this way, developers can maintain a cleaner and more organized codebase, making it easier to manage and update assets as needed. Additionally, by including only the necessary assets for each version, developers can reduce the overall size of the app bundle, resulting in faster download and startup times for users.

Overall, Flavor-Conditional Asset Bundling is a valuable feature that enhances the development process and improves the performance of Flutter apps.

7. Gradle Kotlin DSL Support

Gradle Kotlin DSL Support in Flutter 3.22 is a feature that allows developers to use Kotlin instead of Groovy for writing Gradle build scripts.

Kotlin is a modern, expressive programming language that offers several advantages over Groovy, including better type safety, null safety, and improved tooling support. With Gradle Kotlin DSL Support, developers can take advantage of these benefits when writing their build scripts for Flutter projects.

This can lead to more readable, maintainable, and robust build scripts, ultimately improving the overall development experience for Flutter developers.

8. Platform View Performance Improvements (iOS)

Platform View Performance Improvements in Flutter 3.22 focus on enhancing the performance of platform views within iOS apps. Platform views are essential for integrating native components like maps or web views into Flutter apps.

This update specifically targets performance within scroll views, where multiple platform views are often used. The improvements include a 50% reduction in GPU usage, leading to improved battery efficiency and potentially smoother user interactions.

Additionally, average frame render times have decreased by 1.66ms (a 33% improvement), and worst-case render times have seen a 3.8ms reduction (a 21% improvement), resulting in smoother animations and reduced instances of stuttering during scrolling.

These optimizations are designed to significantly enhance the performance of Flutter apps that utilize platform views on iOS devices, offering users a more fluid and responsive experience.

9. Vertex AI for Firebase Dart SDK Preview

The Vertex AI for Firebase Dart SDK Preview in Flutter 3.22 introduces the Gemini API, which enables developers to integrate generative AI features into their Dart or Flutter apps.

This SDK is designed for production-level performance and scalability, with integration with Firebase App Check for enhanced security. Developers can use the SDK to access the Gemini API’s capabilities, such as image and text generation, in their apps.

This preview release is available at no cost with a promo code, allowing developers to explore and test the SDK’s features before integrating them into their apps.

10. Google Mobile Ads SDK 5.0.1

Google Mobile Ads SDK 5.0.1 in Flutter 3.22 brings several enhancements for developers monetizing their Flutter apps with ads.

This update includes enhanced support for the User Messaging Platform (UMP) SDK, offering new APIs to simplify the consent-gathering process for personalized ads. Additionally, the SDK now supports expanded mediation partners, including Unity, Meta, AppLovin, Iron Source, Mintegral, Pangle, DT Exchange, InMobi, and Liftoff.

These integrations broaden ad monetization options for developers, providing more opportunities to maximize app revenue.

In conclusion, Flutter 3.22 brings some big improvements for app developers. They’ve made it faster and smoother to use, especially for graphics and animations. They’ve also added new ways to organize and manage app assets, like images and fonts, making it easier to build and maintain apps. Plus, there are some cool new features for Android and iOS, like better support for deep links and smoother scrolling.

Overall, Flutter 3.22 makes it easier and more fun to create great apps, also I gathered this information by researching multiple websites. If you come across any incorrect or misinterpreted information, kindly bring it to my attention by commenting below.

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I am Shirsh Shukla, a creative Developer, and a Technology lover. You can find me on LinkedIn or maybe follow me on Twitter or just walk over my portfolio for more details. And of course, you can follow me on GitHub as well.

Have a nice day!🙂



Shirsh Shukla

SDE at Reliance Jio | Mobile Application Developer | Speaker | Technical Writer | community member at Stack Overflow | Organizer @FlutterIndore