如何刷新搜索flutter上的列表视图

Question

Hello下面的dart/flutter代码在列表中进行搜索，我不能做的是在字段搜索完成后刷新列表。正如您从下面的代码中看到的，在dart-flutter中对列表执行搜索，然后推断数据，但列表不会刷新我该怎么做才能确保在dart中重新加载列表是实现的

颤振代码：

//Lista che contiene la lista degli articoli
List<Articolo> foods=new List<Articolo>();
//Lista che contiene la lista delle categorie
List<Categoria> categories;
//Descrizione: funzione che esegue l'init dei valore della view
Future<bool> init() async {
categories = await Categoria.caricamentoCategorie();
if(foods.length==0){
print("n Sono qui");
foods = await Articolo.caricamento(null,null);
}
return true;
}
class SearchScreen extends StatefulWidget {
@override
_SearchScreenState createState() => _SearchScreenState();
}
class _SearchScreenState extends State<SearchScreen>
with AutomaticKeepAliveClientMixin<SearchScreen> {
TextEditingController _searchControl = new TextEditingController();
Future myFuture;
//final _controller = TextEditingController();
VoidCallback _listener;
_SearchScreenState(){
BackButtonInterceptor.add(myInterceptor);
}
@override
void initState() {
super.initState();
_searchControl.addListener(_onTextChanged);
}
@override
void didChangeDependencies() {
super.didChangeDependencies();
if (_listener == null) {
_listener = () {
ricerca();
};
_searchControl.addListener(_listener);
}
}
@override
void dispose() {
super.dispose();
_searchControl.removeListener(_onTextChanged);
}
Future<void> ricerca() async{
if(_searchControl.text!=null){
print("n Sono in ricerca");
foods = await Articolo.caricamento(null,_searchControl.text);
foods = foods.where((item) => item.getCodArt().startsWith(_searchControl.text)).toList();

//foods=foods.where((item) => item.getCodart().contains(_searchControl.text));
print("n foods: "+foods.length.toString());
}
}
void _onTextChanged() {
ricerca();
}
//Disabilito il bottone di back su android
bool myInterceptor(bool stopDefaultButtonEvent, RouteInfo info) {
return true;
}
Widget build(BuildContext context) {
return FutureBuilder<bool>(
future: init(),
builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
if (!snapshot.hasData) {
return new Container();
} else {
super.build(context);
return Padding(
padding: EdgeInsets.fromLTRB(10.0, 0, 10.0, 0),
child: ListView(
children: <Widget>[
SizedBox(height: 10.0),
Card(
elevation: 6.0,
child: Container(
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(
Radius.circular(5.0),
),
),
child: TextField(
style: TextStyle(
fontSize: 15.0,
color: Colors.black,
),
decoration: InputDecoration(
contentPadding: EdgeInsets.all(10.0),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(5.0),
borderSide: BorderSide(
color: Colors.white,
),
),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(
color: Colors.white,
),
borderRadius: BorderRadius.circular(5.0),
),
hintText: "Ricerca..",
suffixIcon: Icon(
Icons.search,
color: Colors.black,
),
hintStyle: TextStyle(
fontSize: 15.0,
color: Colors.black,
),
),
maxLines: 1,
controller: _searchControl,
onChanged: (text) {
print("n testo:"+ _searchControl.text);
_onTextChanged();
},
),
),
),
SizedBox(height: 5.0),
Padding(
padding: EdgeInsets.all(20.0),
child: Text(
"Articoli",
style: TextStyle(
fontSize: 15,
fontWeight: FontWeight.bold,
),
),
),

ListView.builder(
shrinkWrap: true,
//primary: false,
//physics: NeverScrollableScrollPhysics(),
itemCount: foods.length,
itemBuilder: (BuildContext context, int index) {
Articolo food = foods[index];
return ListTile(
title: Text(
food.getCodArt(),
style: TextStyle(

fontWeight: FontWeight.w900,
),
),
leading: ClipRRect(
borderRadius: BorderRadius.circular(8.0),
child:  Image.network(
food.getPathImmagine(),
fit: BoxFit.cover,
width: 100,
height:100
),
),
trailing: Text(""),
subtitle: Row(
children: <Widget>[

Text(
"Prezzo: "+food.getPrezzo(),
style: TextStyle(
color: Colors.red,
fontSize: 14,
fontWeight: FontWeight.bold,
),
),
],
),
onTap: () {
var view=new ProductDetails(food); 
Navigator.push(
context,
MaterialPageRoute(builder: (context) => view));

},
);
},
),
SizedBox(height: 30),
],
),
);
}
});
}
@override
bool get wantKeepAlive => true;
}

Answer 1

我认为您还没有调用setState。除非调用此方法或使用某种状态管理，否则页面不会重新生成。试试这个：

更换

foods = foods
.where((item) => item.getCodArt().startsWith(_searchControl.text))
.toList();

带有

setState(() {
foods = foods
.where((item) => item.getCodArt().startsWith(_searchControl.text))
.toList();
});

然而，我认为你不应该把它存储在食物中，因为它稍后会改变并变得无用。也许可以在搜索结果中声明另一个变量来存储。