How To Create Fade In Fade Out Animation Using Flutter App

import 'package:flutter/material.dart';
void main() {
  runApp(new MyApp());
}
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Transform',
      home: new MyHomePage(),
    );
  }
}
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  AnimationController animationController;
  Animation<double> animation;

  @override
  void initState() {
    super.initState();
    animationController = AnimationController(
      vsync: this,
      duration: Duration(seconds: 5),
    )..addListener(() => setState(() {}));

    animation = Tween<double>(
      begin: 0.0,
      end: 1.0,
    ).animate(animationController);

    animationController.forward();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.blue[100],
      appBar: AppBar(
        backgroundColor: Colors.blue[900],
          title: Text("Fade In Fade Out"
          )),
      body: Center(
        child: FadeTransition(
          opacity: animation,
          child: Container(
            child: Center(child: Text('Bajarangisoft.com',
              style: TextStyle(
                  color: Colors.white,
                  fontSize: 12,
                  fontWeight: FontWeight.bold),
            )),
            color: Colors.blue[900],
            height: 150,
            width: 150,
          ),
        ),
      ),
    );
  }
}