Flutter Speech Recognition (2OS)

flutter speech recognition

a flutter plugin to use the speech recognition ios10+ / android 4.1+

installation

1. depend on it
   add this to your package’s pubspec.yaml file:

dependencies:
  speech_recognition: "^0.2.0+1"

2. install it
   you can install packages from the command line:

$ flutter packages get

alternatively, your editor might support ‘packages get’. check the docs for your editor to learn more.

3. import it
   now in your dart code, you can use:

import 'package:speech_recognition/speech_recognition.dart';

usage

//..
_speech = new speechrecognition();

// the flutter app not only call methods on the host platform,
// it also needs to receive method calls from host.
_speech.setavailabilityhandler((bool result) 
  => setstate(() => _speechrecognitionavailable = result));

// handle device current locale detection
_speech.setcurrentlocalehandler((string locale) =>
 setstate(() => _currentlocale = locale));

_speech.setrecognitionstartedhandler(() 
  => setstate(() => _islistening = true));

// this handler will be called during recognition. 
// the ios api sends intermediate results,
// on my android device, only the final transcription is received
_speech.setrecognitionresulthandler((string text) 
  => setstate(() => transcription = text));

_speech.setrecognitioncompletehandler(() 
  => setstate(() => _islistening = false));

// 1st launch : speech recognition permission / initialization
_speech
    .activate()
    .then((res) => setstate(() => _speechrecognitionavailable = res));

//..
speech.listen(locale:_currentlocale).then((result)=> print('result : $result'));

// ...
speech.cancel();

// ||
speech.stop();

recognition

• ios : speech api
• android : speechrecognizer

permissions

ios

infos.plist, add :

• 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>

swift project

this plugin is written in swift, so to use with in a flutter/objc project,
you need to convert the project to “current swift syntax” ( edit/convert/current swift syntax)

android

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

limitation

on ios, by default the plugin is configured for french, english, russian, spanish.
on android, without additional installations, it will probably works only with the default device locale.

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