Bouncing Button In Flutter

Bouncing Button In Flutter :

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
  double _scale;
  AnimationController _controller;
  @override
  void initState() {
    _controller = AnimationController(
      vsync: this,
      duration: Duration(
        milliseconds: 200,
      ),
      lowerBound: 0.0,
      upperBound: 0.1,
    )..addListener(() {
        setState(() {});
      });
    super.initState();
  }
  
  @override
  void dispose() {
    super.dispose();
    _controller.dispose();
  }

  @override
  Widget build(BuildContext context) {
    _scale = 1 - _controller.value;
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('Tap on the Below Button',style: TextStyle(color: Colors.grey[400],fontSize: 20.0),),
            SizedBox(
              height: 20.0,
            ),
             Center(
            child: GestureDetector(
              onTapDown: _onTapDown,
              onTapUp: _onTapUp,
              child: Transform.scale(
                scale: _scale,
                child: _animatedButtonUI,
              ),
            ),
          ),
          ],
                  
        ),
      ),
    );
  }

  Widget get _animatedButtonUI => Container(
        height: 70,
        width: 200,
        decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(100.0),
            boxShadow: [
              BoxShadow(
                color: Color(0x80000000),
                blurRadius: 30.0,
                offset: Offset(0.0, 5.0),
              ),
            ],
            gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: [
                Color(0xFF0000FF),
                Color(0xFFFF3500),
              ],
            )),
        child: Center(
          child: Text(
            'tap',
            style: TextStyle(
                fontSize: 30.0,
                fontWeight: FontWeight.bold,
                color: Colors.white),
          ),
        ),
      );

  void _onTapDown(TapDownDetails details) {
    _controller.forward();
  }

  void _onTapUp(TapUpDetails details) {
    _controller.reverse();
  }
}

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