Контекст
У меня есть приложение на Kotlin (собственный Android), и оно отправляет данные в подключенный модуль во Flutter. Из Kotlin я отправляю _numA2F , и я хочу показать его в режиме флаттера, но он не работает. Другая переменная (_numF2A), которую я собираюсь отправить обратно в собственное приложение, обновляется правильно.
Вопрос
Не могли бы вы указать, почему _numA2F не Не берете значение, полученное из родного приложения android? Я уже подтвердил, что номер, который я отправляю с Kotlin, получен в модуле flutter.
Это мой код во Flutter:
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
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 Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or press Run > Flutter Hot Reload in a Flutter IDE). Notice that the
// counter didn't reset back to zero; the application is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _numA2F = 1;
int _numF2A = 1;
static const platform = const MethodChannel('com.jssm.af/data');
_MyHomePageState() {
platform.setMethodCallHandler(_receiveFromHost);
}
Future<void> _receiveFromHost(MethodCall call) async {
int number = 11;
try {
print('CHECK THIS OUT!!!!!!!!!');
print(call.method);
if (call.method == "fromHostToClient") {
final String data = call.arguments;
print(call.arguments);
final jData = jsonDecode(data);
number = jData['numA2F'];
}
} on PlatformException catch (e) {
print(e);
}
setState(() {
_numA2F = number;
print("_numberA2F: " + _numA2F.toString());
});
}
void _doubleNumber() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_numF2A = 2 * _numA2F;
});
}
@override
Widget build(BuildContext context) {
print('REBUILDING!!!!!!!!!!');
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'Data received from fa_Android',
),
Text(
'$_numA2F',
style: Theme.of(context).textTheme.headline4,
),
Text(
'Number to be returned (double):',
),
Text(
'$_numF2A',
style: Theme.of(context).textTheme.headline4,
),
RaisedButton(
onPressed: _doubleNumber,
child: const Text('Send Result to Android',
style: TextStyle(fontSize: 20)),
)
],
),
),
);
}
}