main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MaterialApp(home: AnimationPage()));
}

class AnimationPage extends StatefulWidget {
  const AnimationPage({super.key});

  @override
  State<AnimationPage> createState() => _AnimationPageState();
}

class _AnimationPageState extends State<AnimationPage>
    with TickerProviderStateMixin {
  late final AnimationController controller;

  @override
  void initState() {
    super.initState();
    controller = AnimationController(
      vsync: this,
      duration: Duration(seconds: 1),
    )..addListener(() {
      // just print the current value
      debugPrint(controller.value.toString());
    });
    controller.forward();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold();
  }
}