How To Create Bouncing Animation Using Flutter App

import 'package:flutter/material.dart';
void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData.light().copyWith(primaryColor: Colors.deepOrange),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;
  MyHomePage({this.title});
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage>   with SingleTickerProviderStateMixin {
  AnimationController _animationController;

  @override
  void initState() {
    super.initState();

    _animationController = AnimationController(
      vsync: this,
      duration: Duration(milliseconds: 600),
      lowerBound: 0.0,
      upperBound: 0.1,
    );
    _animationController.addListener(() {
      setState(() {});
    });
  }

  @override
  Widget build(BuildContext context) {
    double scale = 1 - _animationController.value;
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.pink,
          title: Text("Bouncing Animation")),
      body: Center(
        child: GestureDetector(
          onTapUp: _onTapUp,
          onTapDown: _onTapDown,
          child: Transform.scale(
            scale: scale,
            child: Container(
              width: 300,
              height: 75,
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(38.0),
                boxShadow: [
                  BoxShadow(
                    color: Colors.black26,
                    offset: Offset(0.0, 2.0),
                    blurRadius: 5.0,
                    spreadRadius: 0.25,
                  ),
                ],
              ),
              child: Text("Tap to Bounce"),
              alignment: Alignment.center,
            ),
          ),
        ),
      ),
    );
  }

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

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