How to align Column's children in different positions in Flutter?

Question

How to achieve the following design in Flutter?

I'm trying to position a Card and a Button within a Column.

The Card must be positioned centered in the Column wihtout taking into consideration the height of the Button.

And the Button must be positioned at the bottom of the Column.

Answer 1

To answer the question's title (aligning items in a "Column" widget), you can do it with the Align widget:

Column(
  children: <Widget>[
    Align(
      alignment: Alignment.center,
      child: Container(...),
    ),
    Align(
      alignment: Alignment.bottomCenter,
      child: Container(...),
    ),
  ],
)