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Learn how to track when the first frame is drawn in an Android embedding `FlutterActivity` using Flutter's `onFlutterUiDisplayed` method.
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Checking the First Frame on Embedding FlutterActivity

When developing applications using Flutter, one common requirement is to determine when the first frame of your application has been rendered. While this is straightforward on iOS thanks to the setFlutterViewDidRenderCallback method, Android developers using FlutterActivity may wonder how to achieve the same functionality. In this guide, we’ll explore how to check for the first frame on embedding FlutterActivity in Android.

Understanding the Challenge

On iOS, detecting when the first frame is drawn is a matter of calling a dedicated method. However, on Android, things are not always so clear cut. The io.flutter.embedding.android.FlutterActivity does not provide a similar built-in feature out of the box. This leaves developers looking for alternative solutions to ensure they can respond appropriately once their application's UI is ready for interaction.

The Solution: Override onFlutterUiDisplayed

After thorough investigation of the Flutter source code, I discovered that the key to solving this problem lies in overriding the method onFlutterUiDisplayed. This method serves as a hook that is triggered when the Flutter UI is displayed for the first time. Here’s how to implement this in your Android application.

Steps to Implement

Extend FlutterActivity: Create a class that extends FlutterActivity. This gives you access to override the relevant methods.

Override onFlutterUiDisplayed():

Within your class, override the onFlutterUiDisplayed() method. This is where you can implement your logic to respond to the first frame being drawn.

Here’s a simple example:

[[See Video to Reveal this Text or Code Snippet]]

Key Benefits of this Approach

Easy Tracking: You can easily track when the Flutter UI is rendered without having to implement complex listeners or callbacks.

Streamlined Integration: This solution is straightforward and fits well within the existing Flutter plugin architecture, making it easier to manage as you continue to develop your app.

Use Cases for Checking the First Frame

Knowing when the first frame is displayed can be crucial for various app functionalities, such as:

Loading Indicators: You can use this method to hide loading spinners or indicators as soon as the app is ready.

Analytics Tracking: This provides a moment to log analytical events, such as user engagement or app performance.

User Experience Enhancements: It allows the implementation of features that depend on the UI’s readiness.

Conclusion

While Android does not have a direct equivalent to iOS's setFlutterViewDidRenderCallback, overriding onFlutterUiDisplayed() in FlutterActivity offers a practical and efficient way to determine when your Flutter UI has been displayed. By following the outlined steps, you can successfully implement this functionality and enhance the user experience of your Flutter application.

Implementing this small but powerful piece of code ensures your app behaves as expected right from the moment it launches. Give it a try in your next Flutter project!