VoiceFunctions provider

gistfile1.dart

import 'package:flutter/cupertino.dart';
import 'package:speech_to_text/speech_recognition_error.dart';
import 'package:speech_to_text/speech_recognition_result.dart';
import 'package:speech_to_text/speech_to_text.dart';

class VoiceFunctions extends ChangeNotifier {
  bool speechEngineState = false;
  final speechTimeoutDuration = Duration(seconds: 5);
  double level = 0.0;
  String lastWords = "";
  String lastError = "";
  String lastStatus = "";
  String secondVoiceInputTest = "";
  String _currentLocaleId = "";
  List<LocaleName> _localeNames = [];
  final SpeechToText speechController = SpeechToText();

  String verifyAnswerWords = '';

  Future<void> initSpeechState() async {
    bool speechEngineState = await speechController.initialize(onError: errorListener, onStatus: statusListener);
    try {
      if (speechEngineState == true) {
        print("getting locales..");
        _localeNames = await speechController.locales();
        var systemLocale = await speechController.systemLocale();
        _currentLocaleId = systemLocale.localeId;
        print("Speech engine initialized!");
      }
      if (speechEngineState == false || speechEngineState == null) {
        throw "Unable to initalize speechController engine, check microphone permissions.";
      }
    } catch (exception) {
      print(exception);
    }
  }

  void stopListening() {
    speechController.stop().then((_) {
      print("stopping..");
      // setState(() {
      //   level = 0.0;
      //   lastStatus = "Stopped, not listening.";
      // });
    });
  }

  void cancelListening() {
    speechController.cancel().then((value) {
      // setState(() {
      //   level = 0.0;
      //   lastStatus = "Not Listening";
      // });
    });
  }

  void errorListener(SpeechRecognitionError error) {
    print("error: " + error.toString());
    if (error.errorMsg.contains('error_speech_timeout')) {
      print("time out occurred");
      stopListening();
      // setState(() {
      //   lastStatus = "speechController timeout hit, ready.";
      // });
    }
    if (error.errorMsg.contains('error_no_match')) {
      print("No match found for voice sample received.");
      stopListening();
      // setState(() {
      //   lastStatus = "Couldn't find any words in voice sample.\n Please try again..";
      // });
    } else {
      print("error: " + error.toString());
      stopListening();
      // setState(() {
      //   lastError = "${error.errorMsg} - ${error.permanent}";
      // });
    }
  }

  void statusListener(String status) {
    print(status);
    // setState(() {
    //   var speechEngineStatus = "$status";
    //   // lastStatus = "$status";
    // });
  }

  _switchLang(selectedVal) {
    // setState(() {
    //   _currentLocaleId = selectedVal;
    // });
    print(selectedVal);
  }

  void soundLevelListener(double level) {
    // setState(() {
    //   this.level = level;
    // });
  }

  // First Listener
  void startFirstVoiceListener() {
    lastWords = "";
    lastError = "";
    speechController.listen(
        onResult: firstVoiceListenerResult,
        listenFor: speechTimeoutDuration,
        localeId: _currentLocaleId,
        onSoundLevelChange: soundLevelListener,
        cancelOnError: true,
        partialResults: true);
    // setState(() {
    //   lastStatus = "Listening...";
    // });
  }

  void firstVoiceListenerResult(SpeechRecognitionResult result) {
    print("${result.recognizedWords} - ${result.finalResult}");
    // print(result.confidence);
    print(result);
    verifyAnswerWords = result.recognizedWords;
    lastWords = result.recognizedWords;
    notifyListeners();
    // setState(() {
    //   // lastWords = "${result.recognizedWords} - ${result.finalResult}";
    //   _textInputcontroller.text = "${result.recognizedWords}";
    //   lastStatus = "Words found from your voice. Please review them. Ready.";
    // });
  }

  void getFirstVoiceResult() => lastWords;

  // Second Listener
  void startSecondListener(Function resultListener) {
    speechController.listen(
        onResult: resultListener,
        listenFor: speechTimeoutDuration,
        localeId: _currentLocaleId,
        onSoundLevelChange: soundLevelListener,
        cancelOnError: true,
        partialResults: true);
    // setState(() {
    //   lastStatus = "Listening...";
    // });
  }

  // No results are provided from this
  void mySecondResultListener(SpeechRecognitionResult result) {
    print(result.confidence); // Nothing printed
    print("${result.recognizedWords} - ${result.finalResult}");
    // setState(() {
    //   _textVerifyInputcontroller.text = "${result.recognizedWords}";
    //   lastStatus = "Not listening";
    //   // secondVoiceInputTest = "${result.recognizedWords} - ${result.finalResult}";
    // });
  }
}