flutter怎么手动刷新_如何手动刷新或重新加载Flutter Firestore StreamBuilder？
I have this application that needs a pull to refresh functionality, so I placed the StreamBuilder Widget inside the RefreshIndicator Widget, but I don't know how to manually refresh the StreamBuilder when the onRefreshed event is triggered.
解決方案
Having the stream as a state variable and resetting on pull on refresh will solve the problem.
In below code, I am resetting the stream on button press. Hope that helps you.
import 'dart:async';
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatefulWidget {
@override
State createState() {
return new _MyAppState();
}
}
class _MyAppState extends State {
var stream; // state variable
@override
void initState() {
super.initState();
stream = newStream(); // initial stream
}
Stream newStream() =>
Stream.periodic(Duration(seconds: 1), (i) => "$i");
@override
Widget build(BuildContext context) {
var streamBuilder = StreamBuilder(
initialData: "0",
stream: stream,
builder: (context, snapshot) {
return new Text(snapshot.data);
});
return MaterialApp(
title: 'Trial',
home: Scaffold(
appBar: AppBar(title: Text('Stream builder')),
body: Column(
children: [
streamBuilder,
FlatButton(
onPressed: () {
setState(() {
stream = newStream(); //refresh/reset the stream
});
},
child: Text("Reset"))
],
)));
}
}
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