Question 1

How do I change text in a Lottie animation at runtime in Flutter?

Accepted Answer

Use the text delegate in LottieDelegates with a callback to modify text dynamically. For example, text: (initialText) => 'New $initialText' updates the text based on the original layer names.

Question 2

Lottie-flutter vs rive for Flutter animations?

Accepted Answer

Lottie-flutter is ideal for importing Adobe After Effects animations via JSON, offering broad compatibility, while Rive is a real-time animation tool with a dedicated editor for interactive designs. Choose based on your animation workflow and control needs.

Question 3

How to loop a Lottie animation only a specific number of times in Flutter?

Accepted Answer

Use a custom AnimationController with the repeat method set to a count. In the onLoaded callback, configure the controller duration and call controller.repeat(count: 3) to loop three times.

Question 4

Does lottie-flutter support Flutter web rendering?

Accepted Answer

Yes, it fully supports Flutter web, but requires the canvaskit renderer for best results. Run your app with flutter run -d chrome --web-renderer canvaskit to ensure compatibility.

Question 5

How to reduce CPU usage with lottie-flutter animations?

Accepted Answer

Enable the render cache parameter when using the Lottie widget. This caches frames to reduce CPU/GPU usage, though it increases memory consumption, as mentioned in the performance section.

Question 6

Can I use Telegram sticker files (.tgs) in my Flutter app with lottie-flutter?

Accepted Answer

Yes, load .tgs files by specifying LottieComposition.decodeGZip as the decoder in the Lottie widget, such as Lottie.asset('file.tgs', decoder: LottieComposition.decodeGZip).

Lottie

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