flutter – AlertDialog example

main.dart

import 'package:flutter/material.dart';

void main() => runApp(const FlutterExample());

class FlutterExample extends StatelessWidget {
  const FlutterExample({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Flutter Example',
        theme: ThemeData(primarySwatch: Colors.pink),
        home: const StateExample()
    );
  }
}

class StateExample extends StatefulWidget {
  const StateExample({Key? key}) : super(key: key);

  @override
  _StateExampleState createState() => _StateExampleState();
}

class _StateExampleState extends State<StateExample> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        backgroundColor: const Color(0xFFF5F5F5),
        appBar: AppBar(
            title: const Text("Flutter - AlertDialog Example")
        ),
        body: bodyContent()
    );
  }


  bodyContent(){
    return Center(
      child: ElevatedButton(
        child: const Text("Show Dialog"),
        onPressed: (){
          showAlertDialog();
        },
      ),
    );
  }


  showAlertDialog(){
    Widget cancelButton = TextButton(
        onPressed: (){
          Navigator.pop(context);
          SnackBar snackBar = const SnackBar(
              content: Text("Cancel Clicked.")
          );
          ScaffoldMessenger.of(context).showSnackBar(snackBar);
        },
        child: const Text("Cancel")
    );

    Widget positiveButton = TextButton(
        onPressed: (){
          Navigator.pop(context);
          SnackBar snackBar = const SnackBar(
              content: Text("Positive button clicked.")
          );
          ScaffoldMessenger.of(context).showSnackBar(snackBar);
        },
        child: const Text("Yes")
    );

    AlertDialog dialog = AlertDialog(
      title: const Text("Dialog Title"),
      content: const Text("This is alert dialog Content."),
      actions: [
        cancelButton,
        positiveButton
      ],
    );

    showDialog(
        context: context,
        builder: (BuildContext context){
          return dialog;
        });
  }
}

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