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class SimpleWidget extends StatefulWidget {
  @override
  SimpleWidgetState createState() => new SimpleWidgetState();
}

class SimpleWidgetState extends State<SimpleWidget> {
  int stepCounter = 0;
  List<Step> steps = [
    new Step(

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import 'package:flutter/material.dart';

class CommonThings {
  static Size width;
  static Size height;
}

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {

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import 'package:flutter/material.dart';

class TextWidget extends StatelessWidget {
  const TextWidget({
    this.labelText,
    this.iconPrefix,
    this.maxLines,
    this.isPassword = false,
  });

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import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatelessWidget {
  @override

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 void main(){
  var x = "4";
  int number = int.parse(x);//STRING to INT

  var y = "4.6";
  double doubleNum = double.parse(y);//STRING to DOUBLE

  var z = 55;
  String myStr = z.toString();//INT to STRING
}

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a non-null string must be provided to a text widget 
  
  // bu hatayı verirse verdiği sayfada text widet null olamaz aşağıdaki gibi null kontrol ekle
Text(usertxt != null ? usertxt : 'Default Value'),

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  'package:flutter/src/widgets/navigator.dart': Failed assertion: line 1748 pos 12: '!_debugLocked': is not true.
    
    // bu hatayı splash ekranında token kontrolü yaptığımda sayfa yönlendirmesinde veriyor. 
    //Sayfa yönlendirme işlemini aşağıdaki gibi yapmak lazım

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import 'package:flutter/material.dart';

class SwitchOnchangedListener extends StatefulWidget {
  @override
  SwitchOnchangedListenerState createState() {
    return new SwitchOnchangedListenerState();
  }
}

class SwitchOnchangedListenerState extends State<SwitchOnchangedListener> {

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 print(Countries.Cote_d_Ivoire.toString().split('.').last.replaceAll("_", " ")); // Cote d Ivoire 

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//import 'dart:math' as math;

Color((math.Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(1.0) 

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import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,