Change Flare animation's colors

flare_animation_widget.dart

import 'package:flare_dart/math/mat2d.dart';
import 'package:flare_flutter/flare.dart';
import 'package:flare_flutter/flare_actor.dart';
import 'package:flare_flutter/flare_controller.dart';
import 'package:flutter/material.dart';

class FlareAnimationWidget extends StatefulWidget {
  final Color fillColor;
  final Color strokeColor;

  const FlareAnimationWidget({
    Key key,
    this.fillColor,
    this.strokeColor,
  })  : 
        super(key: key);

  @override
  _FlareAnimationWidgetState createState() => _FlareAnimationWidgetState();
}

class _FlareAnimationWidgetState extends State<FlareAnimationWidget>
    with FlareController {
  
  FlutterActorArtboard _artboard;


  @override
  bool advance(FlutterActorArtboard artboard, double elapsed) {
    return false;
  }
  
  @override
  void initialize(FlutterActorArtboard artboard) {
    _artboard ??= artboard;

    var theme = Theme.of(context);
    if (theme == null) {
      return;
    }

    artboard.drawableNodes.forEach((node) {
      try {
        if (RegExp("Accent", caseSensitive: false).hasMatch(node.name)) {
          var s = node as FlutterActorShape;
          var fill = s.fill as FlutterColorFill;
          fill?.uiColor = widget.fillColor ?? theme.accentColor;
        }
        if (RegExp("Track", caseSensitive: false).hasMatch(node.name)) {
          var s = node as FlutterActorShape;
          var stroke = s.stroke as FlutterColorStroke;
          var fill = s.fill as FlutterColorFill;
          stroke?.uiColor = widget.strokeColor ?? theme.textTheme.bodyText1.color;
          fill?.uiColor = widget.strokeColor ?? theme.textTheme.bodyText1.color;
        }
      } on Exception catch (e) {
        print(
            "Error applying colors to Flare Animation: ${e.toString()}");
      }
    });
  }

  
  @override
  Widget build(BuildContext context) {
    
    return Center(
      child: FlareActor(
        'animation path',//other params
      ),
    );
  }

  @override
  void setViewTransform(Mat2D viewTransform) {
  }
}