Flutter : Gesture Recognition

Class MyButton extends StatelessWidget {

@override
Widget build(BuildContext context) {
    return GestureDetector (
        onTap() {
        final snackbar = SnackBar (content:Text("Tap"))
        Scaffold.of(context).showSnackBar(snackBar)
    }
    child:Container(padding: EdgeInsets.all(12.0),decoration : BoxDecoration(color:Theme.of(context).buttonColor,borderRadius:BorderRadius.circular(8.0))),
    child:Text("My Button");
    )

}

}

References:
https://flutter.io/cookbook/gestures/handling-taps/