您可以使用https://pub.dartlang.org/packages/flushbar
RaisedButton( child: Text('Show Top Snackbar'), onPressed: () { Flushbar( flushbarPosition: FlushbarPosition.TOP, ) ..title = "Hey Ninja" ..message = "Lorem Ipsum is simply dummy text of the printing and typesetting industry" ..duration = Duration(seconds: 3) ..show(context); },),
