center text in alertdialog flutter code example

Example 1: how to position action widget in alert dialog

AlertDialog(
        title: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text('Tilte'),
              CloseButton(
                  color: Color(0xFFD5D3D3),
                  onPressed: () {
                    Navigator.of(context).pop();
                  })
            ]),
        content: SingleChildScrollView(child: Text("Boby")),
        actions: [
          SizedBox(
              width: MediaQuery.of(context).size.width,
              child: Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    ButtonTheme(
                        minWidth: 25.0,
                        height: 25.0,
                        child: OutlineButton(
                            borderSide: BorderSide(color: Colors.blueAccent),
                            child: new Text("Save"),
                            shape: RoundedRectangleBorder(
                                borderRadius: BorderRadius.circular(20)),
                            onPressed: () {})),
                    SizedBox(width: 8.0),
                    ButtonTheme(
                        minWidth: 25.0,
                        height: 25.0,
                        child: OutlineButton(
                            borderSide: BorderSide(color: Colors.black26),
                            textColor: Colors.blue,
                            child: new Text("Close"),
                            shape: RoundedRectangleBorder(
                                borderRadius: BorderRadius.circular(20)),
                            onPressed: () {}))
                  ]))
        ]);

Example 2: how to position action widget in alert dialog

Row (
    mainAxisAlignment: MainAxisAlignment.spaceBetween,
    children: <Widget>[
        RaisedButton(), // button 1
        RaisedButton(), // button 2
    ]
)