class _MyHomeState extends State
    
      {  @override  Widget build(BuildContext context) {    return Scaffold(        appBar: AppBar(          title: Text('Flutter Demo'),        ),        body: ListView(          children: 
     
      [            Dismissible(              background: Container(                color: Colors.green,                child: Align(                  alignment: AlignmentDirectional.centerStart,                  child: Padding(                    padding: EdgeInsets.only(left: 8),                    child: Icon(Icons.favorite),                  ),                ),              ),              secondaryBackground: Container(                color: Colors.red,                child: Align(                  alignment: AlignmentDirectional.centerEnd,                  child: Padding(                    padding: EdgeInsets.only(right: 8),                    child: Icon(Icons.delete),                  ),                ),              ),              child: ListTile(                title: Text('aaaaaa'),              ),              key: ValueKey('aaaaaa'),              onDismissed: (DismissDirection direction) {                print(direction);              },            ),          ],        ));  }}