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React Native Microsoft Speech

A speech-to-text library for React Native.

npm i react-native-microsoft-speech --save

Table of contents

• Linking
  • Manually Link Android
  • Manually Link iOS
• Usage
  • Example
• API
• Events
• Permissions
  • Android
  • iOS
• Contibutors

Linking

Manually or automatically link the NativeModule

react-native link react-native-microsoft-speech

Example

import Speech from 'react-native-microsoft-speech';
import React, {Component} from 'react';

class SpeechTest extends Component {
  constructor(props) {
    Speech.onSpeechStart = this.onSpeechStartHandler.bind(this);
    Speech.onSpeechEnd = this.onSpeechEndHandler.bind(this);
    Speech.onSpeechResults = this.onSpeechResultsHandler.bind(this);
  }
  onStartButtonPress(e){
    Speech.start('en-US');
  }
  ...
}

API

Static access to the Speech API.

All methods now return a new Promise for async/await compatibility.

Method Name	Description	Platform
Speech.isAvailable()	Checks whether a speech recognition service is available on the system.	Android, iOS
Speech.start(locale)	Starts listening for speech for a specific locale. Returns null if no error occurs.	Android, iOS
Speech.stop()	Stops listening for speech. Returns null if no error occurs.	Android, iOS
Speech.cancel()	Cancels the speech recognition. Returns null if no error occurs.	Android, iOS
Speech.destroy()	Destroys the current SpeechRecognizer instance. Returns null if no error occurs.	Android, iOS
Speech.removeAllListeners()	Cleans/nullifies overridden Speech static methods.	Android, iOS
Speech.isRecognizing()	Return if the SpeechRecognizer is recognizing.	Android, iOS

Events

Callbacks that are invoked when a native event emitted.

Event Name	Description	Event	Platform
Speech.onSpeechStart(event)	Invoked when .start() is called without error.	{ error: false }	Android, iOS
Speech.onSpeechRecognized(event)	Invoked when speech is recognized.	{ error: false }	Android, iOS
Speech.onSpeechEnd(event)	Invoked when SpeechRecognizer stops recognition.	{ error: false }	Android, iOS
Speech.onSpeechError(event)	Invoked when an error occurs.	{ error: Description of error as string }	Android, iOS
Speech.onSpeechResults(event)	Invoked when SpeechRecognizer is finished recognizing.	{ value: [..., 'Speech recognized'] }	Android, iOS
Speech.onSpeechPartialResults(event)	Invoked when any results are computed.	{ value: [..., 'Partial speech recognized'] }	Android, iOS
Speech.onSpeechVolumeChanged(event)	Invoked when pitch that is recognized changed.	{ value: pitch in dB }	Android

Permissions

Arguably the most important part.

Android

While the included VoiceTest app works without explicit permissions checks and requests, it may be necessary to add a permission request for RECORD_AUDIO for some configurations. Since Android M (6.0), user need to grant permission at runtime (and not during app installation). By default, calling the startSpeech method will invoke RECORD AUDIO permission popup to the user. This can be disabled by passing REQUEST_PERMISSIONS_AUTO: true in the options argument.

iOS

Need to include permissions for NSMicrophoneUsageDescription and NSSpeechRecognitionUsageDescription inside Info.plist for iOS. See the included VoiceTest for how to handle these cases.

<dict>
  ...
  <key>NSMicrophoneUsageDescription</key>
  <string>Description of why you require the use of the microphone</string>
  <key>NSSpeechRecognitionUsageDescription</key>
  <string>Description of why you require the use of the speech recognition</string>
  ...
</dict>

Please see the documentation provided by ReactNative for this: PermissionsAndroid