How to animate the color of a RaisedButton in Flutter?

You can use AnimatedContainer as raiseButton child . and when color changed it will be animated!

RaisedButton(
        onPressed: null,
        padding: EdgeInsets.all(0),
        child: AnimatedContainer(
          color: pageIndex == 1 ? Color(0xFF4B4B4B) : Color(0xFFD8D8D8),
          duration: Duration(milliseconds: 300),
        ),
      )

and its just a container so it can have child like text..