How to remove null text on the screen in flutter - dart

Question

I build an app in which there are two pages(screens),the first page receives the data from second page.But the problem is that before getting the data from second page it is showing "null" on the first page screen.Below are the codes of these two pages.Note:The first page screen is the main launcher screen.
First Page
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
String value;
MyHomePage({Key key,this.value}):super(key:key);
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Flutter"),
),
body:Center(
child:new Text("${widget.value}") )
}
Second Page
class _List extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: MyList(),
);
}
}
class MyList extends StatefulWidget {
#override
_MyListState createState() => _MyListState();
}
class _MyListState extends State<MyList> {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: Text("List"),
),
body: new Container(
padding: new EdgeInsets.only(left: 5.0,top: 20.0,right: 5.0),
child: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
GestureDetector(
onTap: (){
var route=new MaterialPageRoute(builder: (BuildContext context)=>new MyHomePage(value: "Apple",),
);
Navigator.of(context).push(route);
},
child: new Card(
child:
new Column(
children: <Widget>[
new Text('Apple'),
new Text('Banana')
],
),
),
),
);
}
}

Answer 1

You can use a blank Container() widget instead of Text() widget like the code below :
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Flutter"),
),
body:Center(
child: widget.value==null ? Container() : new Text("${widget.value}")
)
);
}
}