Flutter Speech Recognition

Target Audience: Beginner

Plugin: speech_recognition

A flutter plugin to use the speech recognition on iOS and Android

Adding Permission

Android :

<uses-permission android:name="android.permission.RECORD_AUDIO" />

iOS

Add Info.plist :

• Privacy — Microphone Usage Description
• Privacy — Speech Recognition Usage Description

<key>NSMicrophoneUsageDescription</key>
<string>This application needs to access your microphone</string>
<key>NSSpeechRecognitionUsageDescription</key>
<string>This application needs the speech recognition permission</string>

Defining Variables :

_isAvailable : tell the platform is Android or ios is available to interact with it or not

_isListening: tell us whether or not the app is currently listening to the microphone

resultText: in this, we set our final text that comes from our speech

 SpeechRecognition _speechRecognition;
bool _isAvailable = false;   
bool _isListening = false;
String resultText = "";

Initialize it

First, we need to initialize some bunch of different callback for the speech recognition object to work everything properly

setAvailabilityHandler: which let us know about availability and here we update our _isAvailable variable.

setRecognitionStartedHandler: It starts executed when we start the speech recognition service. when its start working we set our _isListening true.

setRecognitionResultHandler: This is our main through this callBack we get out text from our speech recognition service. And here we set our resultText

setRecognitionCompleteHandler: It starts executed when we end with our speech recognition service. when its end up we set our _isListening false.

_speechRecognition = SpeechRecognition();

_speechRecognition.setAvailabilityHandler(
      (bool result) => setState(() => _isAvailable = result),
);

_speechRecognition.setRecognitionStartedHandler(
      () => setState(() => _isListening = true),
);

_speechRecognition.setRecognitionResultHandler(
      (String speech) => setState(() => resultText = speech),
);

_speechRecognition.setRecognitionCompleteHandler(
      () => setState(() => _isListening = false),
);

_speechRecognition.activate().then(
      (result) => setState(() => _isAvailable = result),
);

Listening Speech Recognition Service

if (_isListening)
  _speechRecognition.stop().then(
        (result) => setState(() => _isListening = result),
      );

OnStop

if (_isListening)
  _speechRecognition.stop().then(
        (result) => setState(() => _isListening = result),
      );

OnCanceling

if (_isListening)
  _speechRecognition.cancel().then(
        (result) => setState(() {
              _isListening = result;
              resultText = "";
            }),
      );

Don’t forget to give permission

Link for repository

flutter-devs/speech-Recognition-demo
speech_recognition plugin exploring This project is a starting point for a Flutter application. A few resources to get…github.com

Thanks for reading this article if you find anything that could be improved please let me know, I would love to improve.

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