How to create a rounded button in flutter ?

As FlatButton and RaisedButton are deprecated in flutter 2.0 , you need to use the ElevatedButton, here's a quick examaple:

ElevatedButton(
  child: Text("ElevatedButton"),
  onPressed: () => print("it's pressed"),
  style: ElevatedButton.styleFrom(
    primary: Colors.red,
    onPrimary: Colors.white,
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(32.0),
    ),
  ),
)