我是编程的初学者,并尝试在Flutter中编写App。我将数据从algolia加载到StreamBuilder(通过将algolia lib与as.Stream()结合使用-否则它将不起作用)。该代码运行良好,但它不会自动刷新数据-我必须在应用程序中加载新屏幕或热重载,然后数据才会更新。看起来StatefulWidget的行为类似于StatelessWidget。您有任何想法-可能在某处包括setState(我认为这对于StreamBuilder而言不是必需的)?感谢您的帮助;-)。
import 'package:first_app/group_detail.dart';
import 'package:flutter/material.dart';
import 'package:algolia/algolia.dart';
class First extends StatefulWidget {
@override
FirstState createState() {
return new FirstState();
}
}
class FirstState extends State<First> {
static Algolia algolia = Algolia.init(
applicationId: 'xxx',
apiKey: 'xxx',
);
queryFunc() {
AlgoliaQuery query = algolia.instance.index('places).setAroundLatLng('51.5078845,7.4702625');
Future<AlgoliaQuerySnapshot> snap = query.getObjects();
return snap;
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return StreamBuilder(
stream: queryFunc().asStream(),
builder:
(BuildContext context, AsyncSnapshot<AlgoliaQuerySnapshot> snapshot) {
if (!snapshot.hasData) return new Text('Loading...');
final int documentsLength = snapshot.data.hits.length;
return new ListView.builder(
itemCount: documentsLength,
itemBuilder: (context, int index) {
final AlgoliaObjectSnapshot document = snapshot.data.hits[index];
return new ListTile(
leading: CircleAvatar(
child: Text(document.data['name'].substring(0, 1))),
title: new Text(document.data['name']),
subtitle: new Text(document.data['text]),
);
});
},
);
}
}
答案 0 :(得分:0)
我还与Dart的Algolia软件包一起工作,并且在实施方面苦苦挣扎。现在您的问题对我有很大帮助,我想我也可以为您解决问题。您应该改用FutureBuilder。我的代码看起来像这样,与您的代码非常相似,但是应该适合您的情况:)
class Test extends StatefulWidget {
@override
_TestState createState() => _TestState();
}
class _TestState extends State<Test> {
final Searchalgolia searchalgolia = new Searchalgolia();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('test'),
),
body: Container(child:
FutureBuilder(
// perfomrs query in Algolia and returns snap from .getObjects()
future: searchalgolia.searchAlgolia("joas"),
builder: (BuildContext context, AsyncSnapshot snapshot){
if(snapshot.data == null ){
return LinearProgressIndicator();
}
else {
return ListView.builder(
itemCount: snapshot.data.hits.length,
itemBuilder: (BuildContext context, int index) {
final AlgoliaObjectSnapshot document = snapshot.data.hits[index];
return ListTile(
title: Text(document.data['subject']),
onTap: () {
Navigator.push(context,
MaterialPageRoute(builder: (context) => PatientOverview(snapshot.data[index].id,
"AZ" + snapshot.data[index].id) ));
}
);
},
);}
}
)),
);}}