Flutter

https://medium.com/@nils.backe/flutter-alert-dialogs-9b0bb9b01d28 https://stackoverflow.com/questions/50964365/alert-dialog-with-rounded-corners-in-flutter Dialogs In essence, dialogs are pop-up for further user verification/notification. There are few types of dialogs: AlertDialog  (rows of buttons below body). SimpleDialog  (handles scrolling of contents and no buttons below body). showCupertinoDialog  (iOS-style). showGeneralDialog  (allows customisations). showDialog () 3 Parameters. child is deprecated.  Return child from builder, example below. BuildContext context, Widget child,//deprecated WidgetBuilder builder, showDialog( context: context , barrierDismissible: true , builder: (BuildContext context) { return AlertDialog( content: new Text( "Welcome" ), actions: <Widget>[ new IconButton( icon: new Icon(Icons. launch ), onPressed: (){Naviga...

1. Aim Through Snackbar, understand Context and how to use builder to access any context of a widget. 2.Snackbar Code from Codelab If you use Scaffold.of(context), there will be Context Error "Scaffold.of() called with a context that does not contain a Scaffold" import 'package:flutter/material.dart' ; void main() { runApp( new MaterialApp(home: new SnackApp())); } class SnackApp extends StatefulWidget { @override _SnackAppState createState() => _SnackAppState(); } class _SnackAppState extends State<SnackApp> { @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text( "Snackbar exercise" ), ), body: new Center( child: new RaisedButton( onPressed: (){ final snackBar = SnackBar(content: Text( 'Yay! A SnackBar!' )); Scaffold. of (context).showSnackBar(snackBar); }, ...