Streambuilder did not update Flutter - flutter

Question

STREAMBUILDER
Did not update.
I already tried to work with initState.
On another page the data changes and when you go back to this HOMEPAGE the Streambuilder did not update.
I would be really happy, when you can give me an advice.
I think thats right to use a stateful widget isn't it.
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class Homepage extends StatefulWidget {
#override
HomepageState createState() => _HomepageState();
}
class _HomepageState extends State<Homepage> {
UserLevelStandGrossKlein lus = UserLevelStandGrossKlein();
SharedPreferences prefs;
UserLevelStand usl = UserLevelStand();
String name = 'Tom';
#override
void initState() {
super.initState();
}
#override
void dispose() {
lus.startWork();
usl.startWork();
super.dispose();
}
#override
Widget build(BuildContext context) {
setState(() {
lus.startWork();
usl.startWork();
});
return Scaffold(
backgroundColor: Colors.white,
body: SafeArea(
child: Column(
children: [
Row(children: [
Padding(
padding: const EdgeInsets.fromLTRB(30, 60, 0, 0),
child: RichText(
text: TextSpan(
style: TextStyle(
fontSize: 25,
color: Colors.black
),
children: <TextSpan>[
TextSpan(text: 'Guten Tag,', style: TextStyle(fontWeight: FontWeight.normal)),
TextSpan(text:'\n'+ name, style: TextStyle(fontWeight: FontWeight.bold)),
],
),
), ),
Spacer(),
GestureDetector(
onTap: (){
Navigator.push(context, MaterialPageRoute(builder: (context) => Profil()));
},
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 60, 40, 0),
child: Image.asset("assets/pic.jpg",
width: 80,),
),
)
]
),
StreamBuilder(
initialData:User(1, 'Lädt'),
stream: usl.stream(),
builder: (BuildContext context, AsyncSnapshot snapchot){
User lus = snapchot.data;
String stand2 = lus.userD <=25 ? 'Beginner': 'Fortgeschritten';
return
Padding(
padding: const EdgeInsets.fromLTRB(30, 0, 0, 0),
child: Stack(
alignment: Alignment.topLeft,
children: [Container(
height: 6,
width: 150,
decoration: BoxDecoration(
color: Colors.grey,
borderRadius: BorderRadius.all(Radius.circular(9)),
Container(color: Colors.black,),
AnimatedContainer(
duration: Duration(seconds: 5),
width: lus.userD,
height: 6,
decoration:
BoxDecoration(
color: Colors.blue,
borderRadius: BorderRadius.all(Radius.circular(9)))
)],
),
);
}