Code for DefaultAppBar

default_app_bar.dart

class DefaultAppBar extends StatefulWidget implements PreferredSizeWidget {
  @override
  Size get preferredSize => Size.fromHeight(56.0);

  @override
  _DefaultAppBarState createState() => _DefaultAppBarState();
}

class _DefaultAppBarState extends State<DefaultAppBar> {
  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        AppBar(
          title: Text("Flutter App"),
          actions: <Widget>[
            IconButton(
              icon: Icon(Icons.search),
            ),
            IconButton(
              icon: Icon(Icons.more_vert),
              onPressed: () {},
            )
          ],
        ),
      ]
    );
  }
}