如何在颤动中改变收音机或RadioListTile的填充？

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

class RadioAnimationWidget extends StatefulWidget {
  @override
  _RadioAnimationWidgetState createState() => _RadioAnimationWidgetState();
}

class _RadioAnimationWidgetState extends State<RadioAnimationWidget>
    with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation<double> _animation;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(milliseconds: 500),
      vsync: this,
    );
    _animation = Tween<double>(begin: 0, end: 1).animate(_controller);
  }

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

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        if (_controller.status == AnimationStatus.completed) {
          _controller.reverse();
        } else {
          _controller.forward();
        }
      },
      child: AnimatedBuilder(
        animation: _animation,
        builder: (BuildContext context, Widget child) {
          return RadioListTile(
            title: Text('Radio'),
            value: true,
            groupValue: true,
            onChanged: (bool value) {},
            secondary: Icon(Icons.radio_button_checked),
            controlAffinity: ListTileControlAffinity.trailing,
            activeColor: Colors.blue,
            tileColor: Colors.blue.withOpacity(_animation.value),
          );
        },
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Radio Animation')),
        body: Center(
          child: RadioAnimationWidget(),
        ),
      ),
    );
  }
}