如何在颤动中等待对话框等待间隙广告

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Flutter Dialog with Gap Ad')),
        body: Center(child: Builder(builder: (context) {
          return RaisedButton(
            child: Text('Show Dialog'),
            onPressed: () {
              showDialogWithGapAd(context);
            },
          );
        })),
      ),
    );
  }

  void showDialogWithGapAd(BuildContext context) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('Dialog Title'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              Text('This is a dialog with a gap ad.'),
              SizedBox(height: 20), // 添加间隙
              Container(
                width: double.infinity,
                height: 50,
                color: Colors.grey[300],
                child: Center(child: Text('Gap Ad')),
              ),
              SizedBox(height: 20), // 添加间隙
              Text('Continue with the dialog.'),
            ],
          ),
          actions: <Widget>[
            FlatButton(
              child: Text('Close'),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
          ],
        );
      },
    );
  }
}