如何在我的flutter应用程序主页中添加自定义动画？

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

class CustomAnimationWidget extends StatefulWidget {
  @override
  _CustomAnimationWidgetState createState() => _CustomAnimationWidgetState();
}

class _CustomAnimationWidgetState extends State<CustomAnimationWidget>
    with SingleTickerProviderStateMixin {
  AnimationController _animationController;
  Animation<double> _animation;

  @override
  void initState() {
    super.initState();
    _animationController = AnimationController(
      duration: Duration(seconds: 2),
      vsync: this,
    );
    _animation = Tween<double>(begin: 0, end: 1).animate(_animationController);
    _animationController.forward();
  }

  @override
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _animation,
      builder: (BuildContext context, Widget child) {
        return Opacity(
          opacity: _animation.value,
          child: Transform.scale(
            scale: _animation.value,
            child: Container(
              width: 200,
              height: 200,
              color: Colors.blue,
            ),
          ),
        );
      },
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter App'),
      ),
      body: Center(
        child: CustomAnimationWidget(),
      ),
    );
  }
}