Flutter Example - AlertDialog

import 'package:flutter/material.dart';

class AlertDialogDemo extends StatelessWidget {
  // Global Key of Scaffold
  final scaffoldKey = GlobalKey<ScaffoldState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: scaffoldKey,
      appBar: AppBar(title: Text("AlertDialog Demo")),
      body: Center(
          child: RaisedButton(
        child: Text("Show AlertDialog"),
        onPressed: () {
          showAlertDialog(context);
        },
      )),
    );
  }

  void showAlertDialog(BuildContext context) async {
    String result = await showDialog(
      context: context,
      barrierDismissible: false, // user must tap button!
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('AlertDialog Demo'),
          content: Text("Select button you want"),
          actions: <Widget>[
            FlatButton(
              child: Text('OK'),
              onPressed: () {
                Navigator.pop(context, "OK");
              },
            ),
            FlatButton(
              child: Text('Cancel'),
              onPressed: () {
                Navigator.pop(context, "Cancel");
              },
            ),
          ],
        );
      },
    );

    scaffoldKey.currentState
      ..hideCurrentSnackBar()
      ..showSnackBar(
        SnackBar(
          content: Text("Result: $result"),
          backgroundColor: Colors.orange,
          action: SnackBarAction(
            label: "Done",
            textColor: Colors.white,
            onPressed: () {},
          ),
        ),
      );
  }
}

 

 

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