【flutter】ボタンウィジェット

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class _MyHomePageState extends State<MyHomePage> {
 
  static var _message = "ok.";
  static var _janken = <String>['グー','チョキ','パー'];
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('App Name'),
      ),
      body:
      new Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          mainAxisSize: MainAxisSize.max,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.all(20.0),
              child: Text(
                _message,
                style: TextStyle(
                  fontSize: 32.0,
                  fontWeight: FontWeight.w400,
                  fontFamily:"Robot"
                ),
              ),
            ),
              TextButton(
                onPressed: buttonPressed,
                child: Padding(
                  padding: EdgeInsets.all(10.0),
                  child: Text(
                    "Push me!",
                    style: TextStyle(
                      fontSize: 32.0,
                      color: const Color(0xff000000),
                      fontWeight: FontWeight.w400, fontFamily: "Robot"),
                )
              )
            )
          ]
        ),
 
      ),
 
    );
  }
 
  void buttonPressed(){
    setState((){
      _message = (_janken..shuffle()).first;
    });
  }
}
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  TextButton(
    onPressed: buttonPressed,
    child: Padding(
      padding: EdgeInsets.all(10.0),
      child: Icon(
        Icons.android,
        size: 50.0,
    )
  )
)

elevatedbutton, iconButtonなどがある