[Flutter] How to disable splash highlight of FlatButton in Flutter?

I have a FlatButton. I don't want the splash highlight when the button is clicked. I tried changing the splash colour to transparent, but that didn't work. Here is the code for my FlatButton.

Widget button = new Container(
child: new Container(
padding: new EdgeInsets.only(bottom: 20.0),
alignment: Alignment.center,
child: new FlatButton(
onPressed: () {
_onClickSignInButton();
},
splashColor: Colors.transparent,
child: new Stack(
alignment: Alignment.center,
children: <Widget>[
new Image.asset('images/1.0x/button1.png',
),
new Text("SIGN IN",
style: new TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 16.0
),
)
],
),
),
),
);

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