“alerta de alertdialog” Código de respuesta

Flutter alertdialog

AlertDialog(
          title: const Text('AlertDialog Title'),
          content: const Text('this is a demo alert diolog'),
          actions: <Widget>[
            TextButton(
              child: const Text('Approve'),
              onPressed: () { 
              	Navigator.of(context).pop();
              },
            ),
          ],
        );
Sore Serval

alerta de alertdialog

showAlertDialog(BuildContext context) {

  // set up the button
  Widget okButton = FlatButton(
    child: Text("OK"),
    onPressed: () { },
  );

  // set up the AlertDialog
  AlertDialog alert = AlertDialog(
    title: Text("My title"),
    content: Text("This is my message."),
    actions: [
      okButton,
    ],
  );

  // show the dialog
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return alert;
    },
  );
}
Fierce Flatworm

showcupertinoalertdialog código de código

showCupertinoDialog(
                                  context: context,
                                  builder: (BuildContext context) =>
                                      CupertinoAlertDialog(
                                        content: Text(
                                            'Hiiii You are Welcome'),
                                        actions: <Widget>[
                                          CupertinoButton(
                                              child: Text('Okay'),
                                              onPressed: () {
                                                Navigator.pop(context);
                                              })
                                        ],
                                      ));
Kalyan Chandra

Mostrar el diálogo de alerta automáticamente en Flutter cuando se abre la aplicación

import 'dart:async';
  import 'package:flutter/material.dart';

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

  class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return MaterialApp(
          title: 'Trial',
          home: Scaffold(
              appBar: AppBar(title: Text('List scroll')), body: new MyHome()));
    }
  }

  class MyHome extends StatelessWidget { // Wrapper Widget
    @override
    Widget build(BuildContext context) {
      Future.delayed(Duration.zero, () => showAlert(context));
      return Container(
        child: Text("Hello world"),
      );
    }

    void showAlert(BuildContext context) {
      showDialog(
          context: context,
          builder: (context) => AlertDialog(
                content: Text("hi"),
              ));
    }
  }
Motionless Macaque

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