Animated Opacity or Google Opacity In Flutter :

import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Tutorial', theme: ThemeData( primaryColor: Colors.white, ), home: GoogleOpacity(), ); } } class GoogleOpacity extends StatefulWidget { @override GoogleOpacityState createState() => new GoogleOpacityState(); } class GoogleOpacityState extends State<GoogleOpacity> { double _opacity = 1.0; @override Widget build(BuildContext context) { return Row(children: <Widget>[ Column(children: <Widget>[ Container(width: 100.0, height: 100.0, color: Colors.red), Container(width: 100.0, height: 100.0, color: Colors.green), Container(width: 100.0, height: 100.0, color: Colors.blue) ]), Column(children: <Widget>[ Container(width: 100.0, height: 100.0, color: Colors.blue), Opacity( opacity: 0.0, child: Container(width: 100.0, height: 100.0, color: Colors.green)), Container(width: 100.0, height: 100.0, color: Colors.red) ]), Stack(children: <Widget>[ Container( width: 200.0, height: 200.0, child: Image.network( 'http://img2.imgtn.bdimg.com/it/u=2755523882,2215399258&fm=200&gp=0.jpg'), ), AnimatedOpacity( duration: Duration(seconds: 1), opacity: _opacity, child: Container(width: 200.0, height: 200.0, color: Colors.blue)) ]) ]); } @override void initState() { super.initState(); Future.delayed(Duration(seconds: 1), () { setState(() { _opacity = 0.0; }); }); } }
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