show and close dialog flutter

showDialog( context: context, builder: (_) { return AlertDialog( title: Text('Wanna Exit?'), actions: [ FlatButton( onPressed: () => Navigator.pop(context, false), // passing false child: Text('No'), ), FlatButton( onPressed: () => Navigator.pop(context, true), // passing true child: Text('Yes'), ), ], ); }).then((exit) { if (exit == null) return; if (exit) { // user pressed Yes button } else { // user pressed No button } });

flutter show dialog on start

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"),
              ));
    }
  }

Posted by: Guest on December-23-2020

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