speech_recognition

A flutter plugin to use the speech recognition iOS10+ / Android 4.1+

screenshot

Installation

  1. Depend on it Add this to your package's pubspec.yaml file:
dependencies:
  speech_recognition: "^0.3.0"
  1. Install it You can install packages from the command line:
$ flutter packages get
  1. Import it Now in your Dart code, you can use:
import 'package:speech_recognition/speech_recognition.dart';

Usage

//..
_speech = 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

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>

⚠️ iOS : Swift project

Android

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

Limitation

On iOS, by default the plugin is configured for French, English, Russian, Spanish, Italian. On Android, without additional installations, it will probably works only with the default device locale.

Troubleshooting

If you get a MissingPluginException, try to flutter build apk on Android, or flutter build ios

Getting Started

For help getting started with Flutter, view our online documentation.

For help on editing plugin code, view the documentation.

Libraries

speech_recognition

Dart

dart:ui
Built-in types and core primitives for a Flutter application. [...]

Core

dart:async
Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
Classes and utilities that supplement the collection support in dart:core. [...]
dart:convert
Encoders and decoders for converting between different data representations, including JSON and UTF-8. [...]
dart:core
Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
Interact with developer tools such as the debugger and inspector. [...]
dart:math
Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

VM

dart:io
File, socket, HTTP, and other I/O support for non-web applications. [...]
dart:isolate
Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]