How to constrain height of AlertDialog

Wrap your content with a Column and set mainAxisSize to MainAxisSize.min:

AlertDialog(
  content: Column(
    mainAxisSize: MainAxisSize.min,
    children: <Widget>[
      //your content
    ],
  ),

You can wrap it inside a SizedBox or ConstrainedBox

ConstrainedBox(
  constraints: BoxConstraints(maxHeight: 100.0),
  child: AlertDialog(
    ...
  ),
);

Alternatively, you can set shrinkWrap to true in your ListView so that it takes the least amount of vertical space necessary.

ListView(
  shrinkWrap: true,
  ...
)

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