如何处理_platformCallHandler call speech.onError 7？

Question

我正在尝试在flutter中实现speech_recognition插件。当我说话的时候，识别效果很好，应用程序运行起来也很流畅。但是，当我点击麦克风按钮，什么也没说时，它显示以下错误，然后麦克风按钮的功能停止，直到我重新启动应用程序。

D/SpeechRecognitionPlugin( 1155): onError : 7
I/flutter ( 1155): _platformCallHandler call speech.onSpeechAvailability false
I/flutter ( 1155): _platformCallHandler call speech.onError 7
I/flutter ( 1155): Unknowm method speech.onError 

有人能帮我解决这个问题吗？

这是我的speech_recognition.dart文件

import 'dart:async';

import 'dart:ui';
import 'package:flutter/services.dart';

typedef void AvailabilityHandler(bool result);
typedef void StringResultHandler(String text);

/// the channel to control the speech recognition
class SpeechRecognition {
  static const MethodChannel _channel =
      const MethodChannel('speech_recognition');

  static final SpeechRecognition _speech = new SpeechRecognition._internal();

  factory SpeechRecognition() => _speech;

  SpeechRecognition._internal() {
    _channel.setMethodCallHandler(_platformCallHandler);
  }

  AvailabilityHandler availabilityHandler;

  StringResultHandler currentLocaleHandler;
  StringResultHandler recognitionResultHandler;

  VoidCallback recognitionStartedHandler;

  VoidCallback recognitionCompleteHandler;
  VoidCallback errorHandler;

  /// ask for speech  recognizer permission
  Future activate() => _channel.invokeMethod("speech.activate");

  /// start listening
  Future listen({String locale}) =>
      _channel.invokeMethod("speech.listen", locale);

  Future cancel() => _channel.invokeMethod("speech.cancel");

  Future stop() => _channel.invokeMethod("speech.stop");

  Future _platformCallHandler(MethodCall call) async {
    print("_platformCallHandler call ${call.method} ${call.arguments}");
    switch (call.method) {
      case "speech.onSpeechAvailability":
        availabilityHandler(call.arguments);
        break;
      case "speech.onCurrentLocale":
        currentLocaleHandler(call.arguments);
        break;
      case "speech.onSpeech":
        recognitionResultHandler(call.arguments);
        break;
      case "speech.onRecognitionStarted":
        recognitionStartedHandler();
        break;
      case "speech.onRecognitionComplete":
        recognitionCompleteHandler();
        break;
      case "speech.onError":
        errorHandler();
        break;
      default:
        print('Unknowm method ${call.method} ');
    }
  }

  // define a method to handle availability / permission result
  void setAvailabilityHandler(AvailabilityHandler handler) =>
      availabilityHandler = handler;

  // define a method to handle recognition result
  void setRecognitionResultHandler(StringResultHandler handler) =>
      recognitionResultHandler = handler;

  // define a method to handle native call
  void setRecognitionStartedHandler(VoidCallback handler) =>
      recognitionStartedHandler = handler;

  // define a method to handle native call
  void setRecognitionCompleteHandler(VoidCallback handler) =>
      recognitionCompleteHandler = handler;

  void setCurrentLocaleHandler(StringResultHandler handler) =>
      currentLocaleHandler = handler;

  void setErrorHandler(VoidCallback handler) => errorHandler = handler;

}

Answer 1

speech_recognition不是主动维护的。有如此多的拉取请求仍在等待合并。你可以选择speech_to_text库。

在default用例之前的_platformCallHandler函数中，添加以下用例。

case "speech.onError":
   errorHandler();
   break;

在recognitionCompleteHandler下面声明errorHandler。

VoidCallback errorHandler;

在文件的末尾，声明公共方法以设置此errorHandler

void setErrorHandler(VoidCallback handler) => errorHandler = handler;

这是大量的工作，所以您可以使用已经实现了上述功能的flutter_speech库。

在您的实现中，处理错误处理程序

_speechRecognition.setErrorHandler(() {
   initSpeechRecognizer();
});