Flutter how to get subtext aligned under title in appbar?

Question

I have the following app bar in flutter and trying to align the subtext "Your desired business name" under the title enter. I have tried different methods but still can't get to align. It should have "enter" at the top and then the subtext aligned center

Here is my current code

Widget build(BuildContext context) {
    return Scaffold(
      appBar: PreferredSize(
          preferredSize: Size.fromHeight(75.0), 
          child: AppBar(
            centerTitle: true,
            title: Text('enter'),
            actions: <Widget>[
              new Container(),
              new Center(
                  child: Text(
                'Your desired business name',
                textAlign: TextAlign.center,
                style: new TextStyle(
                  fontSize: 14.0,
                  color: Colors.white,
                ),
              )),
            ],
          )),  
    );
  }

Answer 1

To align Text under AppBar title you can use bottom property of AppBar which takes PreferredSize widget as a parameter which also helps you to adjust the height of AppBar according to your need.

Here's the code

AppBar(
    title: Text('Title 1'),
    centerTitle: true,
    bottom: PreferredSize(
        child: Text("Title 2"),
        preferredSize: null),
  )

Answer 2

The menu bar actions widgets get aligned on the right and as far as I know it is not possible to obtain your desidered layout.

Should you consider a column based widget with a title and subtitle:

Widget build(BuildContext context) {
  return Scaffold(
    appBar: new AppBar(
      centerTitle: true,
      title: Column(children: [
        Text(
          "Title",
        ),
        GestureDetector(
          child: Text('subtitle'),
          onTap: () {
            print("tapped subtitle");
          },
        )
      ]),
      ...

In this example there is a GestureDetector for give interactivity to subtitle, since it seems it is what you are trying to do.