Hello the dart code below has a series of errors when it executes the code I have the error below, how can I do to fix it?
Error:
Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed
assertion: line 4263 pos 12: '_debugLifecycleState != _ElementLifecycle.defunct': is not true.
React.js Code:
..
//Classe per la ricerca dei cantieri
class RapportiniScreen extends StatefulWidget {
const RapportiniScreen({Key key, this.animationController}) : super(key: key);
final AnimationController animationController;
@override
_RapportiniScreenState createState() => _RapportiniScreenState();
}
class _RapportiniScreenState extends State<RapportiniScreen>
with TickerProviderStateMixin {
bool isShowingMainData = true;
final ScrollController scrollController = ScrollController();
Animation<double> topBarAnimation;
double topBarOpacity = 0.0;
@override
void dispose() {
listViews.clear();
super.dispose();
}
//Disabilito il bottone di back su android
bool myInterceptor(bool stopDefaultButtonEvent) {
return true;
}
//Funzione di inizializzazione della View
@override
void initState() {
BackButtonInterceptor.add(myInterceptor);
topBarAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
CurvedAnimation(
parent: widget.animationController,
curve: Interval(0, 0.5, curve: Curves.fastOutSlowIn)));
scrollController.addListener(() {
if (scrollController.offset >= 24) {
if (topBarOpacity != 1.0) {
setState(() {
topBarOpacity = 1.0;
});
}
} else if (scrollController.offset <= 24 &&
scrollController.offset >= 0) {
if (topBarOpacity != scrollController.offset / 24) {
setState(() {
topBarOpacity = scrollController.offset / 24;
});
}
} else if (scrollController.offset <= 0) {
if (topBarOpacity != 0.0) {
setState(() {
topBarOpacity = 0.0;
});
}
}
});
super.initState();
}
//Funzione che si occupa di aggiungere gli elementi alla lista dei widget
Future<bool> addAllListData() async {
//Eseguo il caricamento dei rapportini
await ricercaRapportini("");
try {
//Aggiunta alla list della view corrispondente al cantiere
if (rapportiniricercati != null) {
//Eseguo la ricerca dei cantieri
for (int i = 0; i < rapportiniricercati.length; i++) {
//Aggiunta alla list della view corrispondente al cantiere
listViews.add(
new SchedaRapportiniView(
animation: Tween<double>(begin: 0.0, end: 1.0).animate(
CurvedAnimation(
parent: widget.animationController,
curve: Interval((1 / 5) * 2, 1.0,
curve: Curves.fastOutSlowIn))),
animationController: widget.animationController,
rtemp: rapportiniricercati[i],
),
);
}
}
} catch (err) {
print("Errore: " + err);
}
return true;
}
//Widget UiListView
Widget getMainListViewUI() {
return new ListView.builder(
controller: scrollController,
padding: EdgeInsets.only(
top: AppBar().preferredSize.height +
MediaQuery.of(context).padding.top +
24,
bottom: 62 + MediaQuery.of(context).padding.bottom,
),
itemCount: listViews.length,
scrollDirection: Axis.vertical,
itemBuilder: (BuildContext context, int index) {
widget.animationController.forward();
return listViews[index];
});
}
//Widget per la AppBarUI
Widget getAppBarUI() {
return Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
AnimatedBuilder(
animation: widget.animationController,
builder: (BuildContext context, Widget child) {
return FadeTransition(
opacity: topBarAnimation,
child: Transform(
transform: Matrix4.translationValues(
0.0, 30 * (1.0 - topBarAnimation.value), 0.0),
child: Container(
decoration: BoxDecoration(
color: TemaApp.white.withOpacity(topBarOpacity),
borderRadius: const BorderRadius.only(
bottomLeft: Radius.circular(32.0),
),
boxShadow: <BoxShadow>[
BoxShadow(
color: TemaApp.grey.withOpacity(0.4 * topBarOpacity),
offset: const Offset(1.1, 1.1),
blurRadius: 10.0),
],
),
child: Column(
children: <Widget>[
SizedBox(
height: MediaQuery.of(context).padding.top,
),
Padding(
padding: EdgeInsets.only(
left: 16,
right: 16,
top: 16 - 8.0 * topBarOpacity,
bottom: 12 - 8.0 * topBarOpacity),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
'Rapportini',
textAlign: TextAlign.left,
style: TextStyle(
fontFamily: TemaApp.fontName,
fontWeight: FontWeight.w700,
fontSize: 22 + 6 - 6 * topBarOpacity,
letterSpacing: 1.2,
color: TemaApp.darkerText,
),
),
),
),
//Bottone che effettua la ricerca dei rapportini
IconButton(
icon: Icon(Icons.search),
onPressed: () {
showSearch(
context: context,
delegate: DataSourceRapportini(
rapportiniricercati));
})
],
),
)
],
),
),
),
);
},
)
],
);
}
//Build
@override
Widget build(BuildContext context) {
final _screenSize = MediaQuery.of(context).size;
return FutureBuilder<bool>(
future: addAllListData(),
builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
if (snapshot.hasError) {
return new Container();
} else {
return new Container(
color: TemaApp.background,
height: _screenSize.height,
child: Scaffold(
backgroundColor: Colors.transparent,
resizeToAvoidBottomPadding: true,
body: Stack(
children: <Widget>[
getMainListViewUI(),
getAppBarUI(),
SizedBox(
height: MediaQuery.of(context).padding.bottom,
)
],
),
),
);
}
});
}
}
//Classe che si occupa della gestione della ricerca dei rapportini
class DataSourceRapportini extends SearchDelegate<String> {
List<Rapporto> listaRapportini = new List();
DataSourceRapportini(this.listaRapportini);
@override
List<Widget> buildActions(BuildContext context) {
return [
IconButton(
icon: Icon(Icons.clear),
onPressed: () {
query = "";
})
];
}
@override
Widget buildLeading(BuildContext context) {
return IconButton(
icon: AnimatedIcon(
icon: AnimatedIcons.menu_arrow,
progress: transitionAnimation,
),
onPressed: () {
Navigator.pop(context);
});
}
@override
Widget buildResults(BuildContext context) {
return Container(
//Do what you want to show in the result, when click keyboard action Search.
);
}
@override
Widget buildSuggestions(BuildContext context) {
var suggestionList = ricercaRapportini(query);
return ListView.builder(
itemBuilder: (context, index) => ListTile(
leading: Icon(Icons.build),
title: Text("Nome Cantiere: " +
suggestionList[index].getCantiere().getNomeCantiere() +
"
Cliente: " +
suggestionList[index].getCantiere().getRagioneSociale() +
"
IdRapporto: " +
suggestionList[index].getIdRapportoUtente().toString()+"
Commessa:"+suggestionList[index].getCantiere().getCommessa()),
//Funzione che esegue il tap sul ListTile
//Quando viene eseguito il tap viene visualizzata la schermata del rapportino
onTap: () {
final gr = new GestioneRapportini(suggestionList[index]);
Navigator.push(context, MaterialPageRoute(builder: (context) => gr));
},
),
itemCount: suggestionList.length,
);
}
//Funzione che esegue la ricerca dei rapportini
List<Rapporto> ricercaRapportini(String testoricerca) {
List<Rapporto> ltemp = new List();
ltemp = listaRapportini;
if (testoricerca.length > 0) {
//Ricerca per nome cantieri
ltemp = rapportiniricercati
.where((l) => l
.getCantiere()
.getNomeCantiere()
.toLowerCase()
.startsWith(testoricerca))
.toList();
//Ricerca per ragione sociale
ltemp = ltemp +
rapportiniricercati
.where((l) => l
.getCantiere()
.getRagioneSociale()
.toLowerCase()
.startsWith(testoricerca))
.toList();
//Ricerca per commessa
ltemp = ltemp +
rapportiniricercati
.where((l) => l
.getCantiere()
.getCommessa()
.toLowerCase()
.startsWith(testoricerca))
.toList();
}
return ltemp;
}
}
