Basic layout for showcase animations

basic_layout.dart

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin{

  //*-----defining animation and animation controller-----*
  AnimationController _controller;
  Animation _myAnimation;

  //*-----initializing animation and animation controller-----*
  @override
  void initState() {
    super.initState();

  }

  @override
  void dispose() {
    super.dispose();
    //-disposing the animation controller-
    _controller.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Flutter Animations"),
      ),

      body: Center(
          child:
          Container(
            width: 250,
            height: 250,
            decoration: BoxDecoration(
                image: new DecorationImage(
                    image: new AssetImage(
                      'assets/images/sample-image.png',
                    )
                )
            ),
          )
      ),

      floatingActionButtonLocation:
      FloatingActionButtonLocation.centerFloat,

      floatingActionButton:
      FloatingActionButton(
        child: Icon(Icons.play_arrow),
        onPressed: (){
          //*------Enabling the animation-----*
          _controller.forward();
        },
      ),
    );
  }
}