flame/doc/examples/aseprite/lib/main.dart

import 'package:flame/flame.dart';
import 'package:flame/game.dart';
import 'package:flame/sprite_animation.dart';
import 'package:flame/extensions/vector2.dart';
import 'package:flame/components/sprite_animation_component.dart';
import 'package:flutter/material.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final Vector2 size = await Flame.util.initialDimensions();
  runApp(MyGame(size).widget);
}

class MyGame extends BaseGame {
  MyGame(Vector2 screenSize) {
    size = screenSize;
  }

  @override
  Future<void> onLoad() async {
    final image = await images.load('chopper.png');
    final jsonData = await assets.readJson('chopper.json');
    final animation = SpriteAnimation.fromAsepriteData(
      image,
      jsonData,
    );
    final spriteSize = Vector2.all(200);
    final animationComponent = SpriteAnimationComponent(spriteSize, animation)
      ..position = size / 2 - Vector2.all(100);

    add(animationComponent);
  }
}