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expo-speech provides an API that allows you to utilize Text-to-speech functionality in your app.
| Android Device | Android Emulator | iOS Device | iOS Simulator | Web |
|---|---|---|---|---|
- npx expo install expo-speechIf you're installing this in a bare React Native app, you should also follow these additional installation instructions.
import * as React from 'react';
import { View, StyleSheet, Button } from 'react-native';
import * as Speech from 'expo-speech';
export default function App() {
const speak = () => {
const thingToSay = '1';
Speech.speak(thingToSay);
};
return (
<View style={styles.container}>
<Button title="Press to hear some words" onPress={speak} />
</View>
);
}
%%placeholder-start%%const styles = StyleSheet.create({ ... }); %%placeholder-end%%const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
backgroundColor: '#ecf0f1',
padding: 8,
},
});
import * as Speech from 'expo-speech';
Speech.maxSpeechInputLengthType: number
Maximum possible text length acceptable by Speech.speak() method. It is platform-dependent.
On iOS, this returns Number.MAX_VALUE.
Speech.isSpeakingAsync()Determine whether the Text-to-speech utility is currently speaking. Will return true if speaker
is paused.
Returns
Promise<boolean>Returns a Promise that fulfils with a boolean, true if speaking, false if not.
Speech.resume()Resumes speaking previously paused speech or does nothing if there's none. This method is not available on Android.
Returns
Promise<void>Speech.speak(text, options)| Name | Type | Description |
|---|---|---|
| text | string | The text to be spoken. Cannot be longer than |
| options (optional) | SpeechOptions | A Default: {} |
Speak out loud the text given options. Calling this when another text is being spoken adds an utterance to queue.
Returns
voidSpeechEventCallback()| Name | Type | Description |
|---|---|---|
| this | SpeechSynthesisUtterance | - |
| ev | SpeechSynthesisEvent | - |
SpeechOptions| Name | Type | Description |
|---|---|---|
| _voiceIndex (optional) | number | - |
| language (optional) | string | The code of a language that should be used to read the |
| onBoundary (optional) | SpeechEventCallback | null | - |
| onDone (optional) | () => void | SpeechEventCallback | - |
| onError (optional) | (error: Error) => void | SpeechEventCallback | - |
| onMark (optional) | SpeechEventCallback | null | - |
| onPause (optional) | SpeechEventCallback | null | - |
| onResume (optional) | SpeechEventCallback | null | - |
| onStart (optional) | () => void | SpeechEventCallback | - |
| onStopped (optional) | () => void | SpeechEventCallback | - |
| pitch (optional) | number | Pitch of the voice to speak |
| rate (optional) | number | Rate of the voice to speak |
| voice (optional) | string | Voice identifier. |
| volume (optional) | number | Only for: Web Volume of the voice to speak Default: 1.0 |
VoiceObject describing the available voices on the device.
| Name | Type | Description |
|---|---|---|
| identifier | string | Voice unique identifier. |
| language | string | Voice language. |
| name | string | Voice name. |
| quality | VoiceQuality | Voice quality. |
WebVoiceVoice extended by:
| Name | Type | Description |
|---|---|---|
| isDefault | boolean | - |
| localService | boolean | - |
| name | string | - |
| voiceURI | string | - |
VoiceQualityEnum representing the voice quality.
DefaultVoiceQuality.Default ＝ "Default"EnhancedVoiceQuality.Enhanced ＝ "Enhanced"