从MySQL获取数据到Flutter的StreamBuilder

Question

我有一个任务，需要从mysql服务器取出数据并传递到Flutter中的StreamBuilder。我尝试使用我们在Firebase中使用的相同类，现在我遇到了将已从服务器获取的数据传递到StreamBuilder的问题，我记得我必须使用不同类型的快照，请求帮助。

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Server',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.pink,
      ),
      home: MyHomePage(title: 'Flutter Server App'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  get documents => null;




  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        centerTitle: true,
      ),
    );
  }

  Future getData() async{
    var url = 'https://milk-white-reveille.000webhostapp.com/get.php';
    http.Response response = await http.get(url);
    var data = jsonDecode(response.body);
    print(data.toString());


  }

  @override
  void initState() {
    getData();
  }
}

class BookList extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new StreamBuilder(
      stream: _MyHomePageState.getData().snapshot(),
      builder: (BuildContext context, AsyncSnapshot<_MyHomePageState> snapshot) {
        if (snapshot.hasData) return new Text('Loading...');
        return new ListView(
          children: snapshot.data.documents.map((document) {
            return new ListTile(
              title: new Text(document['title']),
              subtitle: new Text(document['type']),
            );
          }).toList(),
        );
      },

    );

  }

}

新代码是这样的。

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'dart:async';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Server',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.pink,
      ),
      home: MyHomePage(title: 'Flutter Server App'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  StreamController _streamController = StreamController();
  Timer _timer;
  var data;

  Future getData() async {
    var url = 'https://milk-white-reveille.000webhostapp.com/get.php';
    http.Response response = await http.get(url);


    String jsonsDataString = response.body.toString(); // toString of Response's body is assigned to jsonDataString
    data = jsonDecode(jsonsDataString);
    print(data.toString());
    //Add your data to stream
    _streamController.add(data);
  }

  @override
  void initState() {
    getData();

    //Check the server every 5 seconds
    _timer = Timer.periodic(Duration(seconds: 5), (timer) => getData());

    super.initState();
  }

  @override
  void dispose() {
    //cancel the timer
    if (_timer.isActive) _timer.cancel();

    super.dispose();
  }
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("Home"),
      ),
      body: new _MySql()

          );

  }
}



class _MySql extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: StreamBuilder(
        stream: _MyHomePageState()._streamController.stream,
        builder: (BuildContext context, AsyncSnapshot snapshot) {
          if (snapshot.hasData)
            return ListView(
              children: snapshot.data((data) {
                return ListTile(
                  title: Text(data['title']),
                  subtitle: Text(data['type']),
                );
              }).toList(),
            );
          return CircularProgressIndicator();
        },
      ),
    );
  }
}

但在手机屏幕上加载...出现了这个来自终端的错误：E/flutter (10194): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: FormatException: Unexpected character (at character 1)E/flutter (10194): connected{"title":"maen","type":"dev"}

- Maen Al Nassan

---

那么你的确切问题是什么？请展示一些错误信息或其他内容。 - Logemann

现在没有错误了，问题出在从快照中将数据传递到列表的过程中。 - Maen Al Nassan

Answer 1

如果你想使用StreamBuilder定期地使用它；

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Server',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.pink,
      ),
      home: MyHomePage(title: 'Flutter Server App'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  StreamController _streamController = StreamController();
  Timer _timer;

  Future getData() async {
    var url = 'https://milk-white-reveille.000webhostapp.com/get.php';
    http.Response response = await http.get(url);
    var data = jsonDecode(response.body);

    //Add your data to stream
    _streamController.add(data);
  }

  @override
  void initState() {
    getData();

    //Check the server every 5 seconds
    _timer = Timer.periodic(Duration(seconds: 5), (timer) => getData());

    super.initState();
  }

  @override
  void dispose() {
    //cancel the timer
    if (_timer.isActive) _timer.cancel();

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        centerTitle: true,
      ),
      body: StreamBuilder(
        stream: _streamController.stream,
        builder: (BuildContext context, AsyncSnapshot snapshot) {
          if (snapshot.hasData)
            return ListView(
              children: snapshot.data.map((document) {
                return ListTile(
                  title: Text(document['title']),
                  subtitle: Text(document['type']),
                );
              }).toList(),
            );
          return Text('Loading...');
        },
      ),
    );
  }
}

- Mehmet Ali Bayram

Answer 2

您应该使用FutureBuilder而不是StreamBuilder。如果您不想定期检查服务器，则无需使用StreamBuilder从服务器获取数据。(如果您希望定期使用它并使用StreamBuilder，请参阅我的下一个回答);

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Server',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.pink,
      ),
      home: MyHomePage(title: 'Flutter Server App'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Future getData() async {
    var url = 'https://milk-white-reveille.000webhostapp.com/get.php';
    http.Response response = await http.get(url);
    var data = jsonDecode(response.body);
    return data;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        centerTitle: true,
      ),
      body: FutureBuilder(
        future: getData(),
        builder: (BuildContext context, AsyncSnapshot snapshot) {
          if (snapshot.hasData)
            return ListView(
              children: snapshot.data.map((document) {
                return ListTile(
                  title: Text(document['title']),
                  subtitle: Text(document['type']),
                );
              }).toList(),
            );
          return Text('Loading...');
        },
      ),
    );
  }
}

- Mehmet Ali Bayram