Flutter FCM 通知 + 文本转语音插件

Question

我正在尝试制作一个从 firebase 云消息中读取通知的应用 我正在使用节点程序发送通知并在颤动中阅读它

import 'package:flutter/material.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_tts/flutter_tts.dart';




void main(){runApp(MyApp());}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {

    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: ' Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {

  MyHomePage({Key key, this.title}) : super(key: key);


  final String title;

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


class _MyHomePageState extends State<MyHomePage> {
  FirebaseMessaging _firebaseMessaging  = new FirebaseMessaging();

  FlutterTts flutterTts = new FlutterTts();
  int _counter = 0;
  String notificationtext;

  void _incrementCounter() {
    setState(() {

      _counter++;
    });
  }
  @override

    void initState() {
      super.initState();
      _firebaseMessaging.subscribeToTopic("bavo");

      _firebaseMessaging.configure(

        onMessage : (Map<String,dynamic> message) {

          print('on message $message');

          setState((){
          _counter = _counter + 100;
          notificationtext = message.toString(); 
          });
        },
        onResume : (Map<String, dynamic> message) {
          print('on resume $message');
           setState((){
          _counter = _counter + 100;
          notificationtext = message.toString();
          });
        },
        onLaunch : (Map<String, dynamic> message) {
          print('on launch $message');
          setState((){
          _counter = _counter + 100;
          notificationtext = message.toString();
          });
        }, 
      );
      _firebaseMessaging.getToken().then((token){
        print(token);

      });
    }
  speak() async {
  flutterTts.speak(notificationtext);
  }

  @override
  Widget build(BuildContext context) {
    flutterTts.speak(notificationtext);
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: new Center(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            new Text(
              'You have pushed the button this many times:',
            ),
            new RaisedButton(
        onPressed: speak,
        child: new Text('Say Hello'),
          ),
            new Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: new FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: new Icon(Icons.add),
      ),
    );
  }
}

正如您在 onmessage 中看到的那样，我设置了一个等于消息的数据有效负载的变量，并且我让它与 initstate 一起玩（这会重新加载小部件，以便它运行文本到语音代码，这是我唯一的工作方式找到）

我的问题是我怎样才能做到这一点，所以如果变量发生变化，即使手机关机，它也会将它与文本一起播放， 现在它告诉它应用程序何时打开，然后才

希望大家帮帮我

Answer 1

我不确定 firebase 消息是如何工作的，但为什么不在你的监听器中运行 flutterTts.speak() 方法。

或者你可以在监听器中调用 speak 方法。

我没有对此进行测试，但可能值得一试。

示例：

   onMessage : (Map<String,dynamic> message) {

      print('on message $message');

      setState((){
        _counter = _counter + 100;
        notificationtext = message.toString();
      });
      flutterTts.speak(message.toString());
    },