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ThorVG for Flutter

pub package License: MIT

This package provides the ThorVG runtime for Flutter, including efficient Lottie animation support via a native API.

Currently, we only support Lottie Animation feature in this package.

Supported Platforms

Platform Architecture
Android arm64-v8a, armeabi-v7a, x86_64
iOS arm64, x86_64, x86_64(simulator)

Usage

Lottie

The Lottie implementation aims to maintain the same interface as lottie-flutter. If you are currently using it, you can simply replace the import statement with import 'package:thorvg/thorvg.dart' to utilize the code.

import 'package:thorvg/thorvg.dart';
// ...
class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Column(
          children: [
            // Load a Lottie animation from the assets
            Lottie.asset('assets/lottie/dancing_star.json'),

            // Load a Lottie animation from a url
            Lottie.network(
              'https://lottie.host/6d7dd6e2-ab92-4e98-826a-2f8430768886/NGnHQ6brWA.json'
            ),
          ],
        ),
      ),
    );
  }
}

Generate Flutter binding

If you change the binding interface in these files

  • tvgFlutterLottieAnimation.h
  • tvgFlutterLottieAnimation.cpp

You must always run the following script:

# Run for the first time
flutter pub get
# Generate bindings with ffigen
flutter pub run ffigen --config ffigen.yaml

You will get ./lib/src/thorvg_bindings_generated.dart.

Build

Specify the ThorVG version in the .gitmodules file.

[submodule "thorvg"]
  path = thorvg
  url = git@github.com:thorvg/thorvg.git
  branch = v0.14.x # Change to version you want

Then you can run the following commands to align with that version before building.

git submodule init
git submodule update --remote

Android

Android build requires NDK(LTS), please specify following build systems info.

# Build for Animation(Lottie)
cd lottie
sh flutter_build.android.sh $NDK $HOST_TAG $API

Check whether these files are generated:

  • android/src/main/arm64-v8a/libthorvg.so
  • android/src/main/armeabi-v7a/libthorvg.so
  • android/src/main/x86_64/libthorvg.so

iOS

# Build for Animation(Lottie)
cd lottie
sh flutter_build.ios.sh

Check whether this file is generated:

  • ios/Frameworks/libthorvg.dylib








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