Added in API level 4

TextToSpeech

open class TextToSpeech
kotlin.Any
   ↳ android.speech.tts.TextToSpeech

Synthesizes speech from text for immediate playback or to create a sound file.

A TextToSpeech instance can only be used to synthesize text once it has completed its initialization. Implement the TextToSpeech.OnInitListener to be notified of the completion of the initialization.
When you are done using the TextToSpeech instance, call the shutdown() method to release the native resources used by the TextToSpeech engine. Apps targeting Android 11 that use text-to-speech should declare android.speech.tts.TextToSpeech.Engine#INTENT_ACTION_TTS_SERVICE in the queries elements of their manifest: 

<queries>
    ...
   <intent>
       <action android:name="android.intent.action.TTS_SERVICE" />
   </intent>
  </queries>

Summary

Nested classes
open

Constants and parameter names for controlling text-to-speech.
open

Information about an installed text-to-speech engine.
abstract

Interface definition of a callback to be invoked indicating the completion of the TextToSpeech engine initialization.
abstract

Listener that will be called when the TTS service has completed synthesizing an utterance.
Constants
static String

Broadcast Action: The TextToSpeech synthesizer has completed processing of all the text in the speech queue.
static Int

Denotes a generic operation failure.
static Int

Denotes a failure caused by an invalid request.
static Int

Denotes a failure caused by a network connectivity problems.
static Int

Denotes a failure caused by network timeout.
static Int

Denotes a failure caused by an unfinished download of the voice data.
static Int

Denotes a failure related to the output (audio device or a file).
static Int

Denotes a failure of a TTS service.
static Int

Denotes a failure of a TTS engine to synthesize the given input.
static Int

Denotes the language is available for the language by the locale, but not the country and variant.
static Int

Denotes the language is available for the language and country specified by the locale, but not the variant.
static Int

Denotes the language is available exactly as specified by the locale.
static Int

Denotes the language data is missing.
static Int

Denotes the language is not supported.
static Int

Queue mode where the new entry is added at the end of the playback queue.
static Int

Queue mode where all entries in the playback queue (media to be played and text to be synthesized) are dropped and replaced by the new entry.
static Int

Denotes a stop requested by a client.
static Int

Denotes a successful operation.
Public constructors

The constructor for the TextToSpeech class, using the default TTS engine.
TextToSpeech(context: Context!, listener: TextToSpeech.OnInitListener!, engine: String!)

The constructor for the TextToSpeech class, using the given TTS engine.
Public methods
open Int
addEarcon(earcon: String, uri: Uri)

Adds a mapping between a string of text and a sound file.
open Int
addEarcon(earcon: String!, file: File!)

Adds a mapping between a string of text and a sound file.
open Int
addEarcon(earcon: String!, filename: String!)

Adds a mapping between a string of text and a sound file.
open Int
addEarcon(earcon: String!, packagename: String!, resourceId: Int)

Adds a mapping between a string of text and a sound resource in a package.
open Int
addSpeech(text: CharSequence, uri: Uri)

Adds a mapping between a CharSequence (may be spanned with TtsSpans) and a sound file.
open Int
addSpeech(text: CharSequence!, file: File!)

Adds a mapping between a CharSequence (may be spanned with TtsSpans) and a sound file.
open Int
addSpeech(text: CharSequence!, packagename: String!, resourceId: Int)

Adds a mapping between a CharSequence (may be spanned with TtsSpans) of text and a sound resource in a package.
open Int
addSpeech(text: String!, filename: String!)

Adds a mapping between a string of text and a sound file.
open Int
addSpeech(text: String!, packagename: String!, resourceId: Int)

Adds a mapping between a string of text and a sound resource in a package.
open Boolean

Checks whether the user's settings should override settings requested by the calling application.
open MutableSet<Locale!>!

Query the engine about the set of available languages.
open String!

Gets the package name of the default speech synthesis engine.
open Locale!

Returns a Locale instance describing the language currently being used as the default Text-to-speech language.
open Voice!

Returns a Voice instance that's the default voice for the default Text-to-speech language.
open MutableList<TextToSpeech.EngineInfo!>!

Gets a list of all installed TTS engines.
open MutableSet<String!>!
getFeatures(locale: Locale!)

Queries the engine for the set of features it supports for a given locale.
open Locale!

Returns a Locale instance describing the language currently being used for synthesis requests sent to the TextToSpeech engine.
open static Int

Limit of length of input string passed to speak and synthesizeToFile.
open Voice!

Returns a Voice instance describing the voice currently being used for synthesis requests sent to the TextToSpeech engine.
open MutableSet<Voice!>!

Query the engine about the set of available voices.
open Int

Checks if the specified language as represented by the Locale is available and supported.
open Boolean

Checks whether the TTS engine is busy speaking.
open Int
playEarcon(earcon: String!, queueMode: Int, params: Bundle!, utteranceId: String!)

Plays the earcon using the specified queueing mode and parameters.
open Int
playEarcon(earcon: String!, queueMode: Int, params: HashMap<String!, String!>!)

Plays the earcon using the specified queueing mode and parameters.
open Int
playSilence(durationInMs: Long, queueMode: Int, params: HashMap<String!, String!>!)

Plays silence for the specified amount of time using the specified queue mode.
open Int
playSilentUtterance(durationInMs: Long, queueMode: Int, utteranceId: String!)

Plays silence for the specified amount of time using the specified queue mode.
open Int

Sets the audio attributes to be used when speaking text or playing back a file.
open Int
setEngineByPackageName(enginePackageName: String!)

Sets the TTS engine to use.
open Int

Sets the text-to-speech language.
open Int

Sets the listener that will be notified when synthesis of an utterance completes.
open Int

Sets the listener that will be notified of various events related to the synthesis of a given utterance.
open Int
setPitch(pitch: Float)

Sets the speech pitch for the TextToSpeech engine.
open Int
setSpeechRate(speechRate: Float)

Sets the speech rate.
open Int
setVoice(voice: Voice!)

Sets the text-to-speech voice.
open Unit

Releases the resources used by the TextToSpeech engine.
open Int
speak(text: CharSequence!, queueMode: Int, params: Bundle!, utteranceId: String!)

Speaks the text using the specified queuing strategy and speech parameters, the text may be spanned with TtsSpans.
open Int
speak(text: String!, queueMode: Int, params: HashMap<String!, String!>!)

Speaks the string using the specified queuing strategy and speech parameters.
open Int

Interrupts the current utterance (whether played or rendered to file) and discards other utterances in the queue.
open Int
synthesizeToFile(text: CharSequence, params: Bundle, fileDescriptor: ParcelFileDescriptor, utteranceId: String)

Synthesizes the given text to a ParcelFileDescriptor using the specified parameters.
open Int
synthesizeToFile(text: CharSequence!, params: Bundle!, file: File!, utteranceId: String!)

Synthesizes the given text to a file using the specified parameters.
open Int
synthesizeToFile(text: String!, params: HashMap<String!, String!>!, filename: String!)

Synthesizes the given text to a file using the specified parameters.

Constants

ACTION_TTS_QUEUE_PROCESSING_COMPLETED

Added in API level 4
static val ACTION_TTS_QUEUE_PROCESSING_COMPLETED: String

Broadcast Action: The TextToSpeech synthesizer has completed processing of all the text in the speech queue. Note that this notifies callers when the engine has finished has processing text data. Audio playback might not have completed (or even started) at this point. If you wish to be notified when this happens, see OnUtteranceCompletedListener.

Value: "android.speech.tts.TTS_QUEUE_PROCESSING_COMPLETED"

ERROR

Added in API level 4
static val ERROR: Int

Denotes a generic operation failure.

Value: -1

ERROR_INVALID_REQUEST

Added in API level 21
static val ERROR_INVALID_REQUEST: Int

Denotes a failure caused by an invalid request.

Value: -8

ERROR_NETWORK

Added in API level 21
static val ERROR_NETWORK: Int

Denotes a failure caused by a network connectivity problems.

Value: -6

ERROR_NETWORK_TIMEOUT

Added in API level 21
static val ERROR_NETWORK_TIMEOUT: Int

Denotes a failure caused by network timeout.

Value: -7

ERROR_NOT_INSTALLED_YET

Added in API level 21
static val ERROR_NOT_INSTALLED_YET: Int

Denotes a failure caused by an unfinished download of the voice data.

Value: -9

ERROR_OUTPUT

Added in API level 21
static val ERROR_OUTPUT: Int

Denotes a failure related to the output (audio device or a file).

Value: -5

ERROR_SERVICE

Added in API level 21
static val ERROR_SERVICE: Int

Denotes a failure of a TTS service.

Value: -4

ERROR_SYNTHESIS

Added in API level 21
static val ERROR_SYNTHESIS: Int

Denotes a failure of a TTS engine to synthesize the given input.

Value: -3

LANG_AVAILABLE

Added in API level 4
static val LANG_AVAILABLE: Int

Denotes the language is available for the language by the locale, but not the country and variant.

Value: 0

LANG_COUNTRY_AVAILABLE

Added in API level 4
static val LANG_COUNTRY_AVAILABLE: Int

Denotes the language is available for the language and country specified by the locale, but not the variant.

Value: 1

LANG_COUNTRY_VAR_AVAILABLE

Added in API level 4
static val LANG_COUNTRY_VAR_AVAILABLE: Int

Denotes the language is available exactly as specified by the locale.

Value: 2

LANG_MISSING_DATA

Added in API level 4
static val LANG_MISSING_DATA: Int

Denotes the language data is missing.

Value: -1

LANG_NOT_SUPPORTED

Added in API level 4
static val LANG_NOT_SUPPORTED: Int

Denotes the language is not supported.

Value: -2

QUEUE_ADD

Added in API level 4
static val QUEUE_ADD: Int

Queue mode where the new entry is added at the end of the playback queue.

Value: 1

QUEUE_FLUSH

Added in API level 4
static val QUEUE_FLUSH: Int

Queue mode where all entries in the playback queue (media to be played and text to be synthesized) are dropped and replaced by the new entry. Queues are flushed with respect to a given calling app. Entries in the queue from other callees are not discarded.

Value: 0

STOPPED

Added in API level 21
static val STOPPED: Int

Denotes a stop requested by a client. It's used only on the service side of the API, client should never expect to see this result code.

Value: -2

SUCCESS

Added in API level 4
static val SUCCESS: Int

Denotes a successful operation.

Value: 0

Public constructors

TextToSpeech

Added in API level 4
TextToSpeech(
    context: Context!, 
    listener: TextToSpeech.OnInitListener!)

The constructor for the TextToSpeech class, using the default TTS engine. This will also initialize the associated TextToSpeech engine if it isn't already running.

Parameters
context Context!: The context this instance is running in.
listener TextToSpeech.OnInitListener!: The TextToSpeech.OnInitListener that will be called when the TextToSpeech engine has initialized. In a case of a failure the listener may be called immediately, before TextToSpeech instance is fully constructed.

TextToSpeech

Added in API level 14
TextToSpeech(
    context: Context!, 
    listener: TextToSpeech.OnInitListener!, 
    engine: String!)

The constructor for the TextToSpeech class, using the given TTS engine. This will also initialize the associated TextToSpeech engine if it isn't already running.

Parameters
context Context!: The context this instance is running in.
listener TextToSpeech.OnInitListener!: The TextToSpeech.OnInitListener that will be called when the TextToSpeech engine has initialized. In a case of a failure the listener may be called immediately, before TextToSpeech instance is fully constructed.
engine String!: Package name of the TTS engine to use.

Public methods

addEarcon

Added in API level 31
open fun addEarcon(
    earcon: String, 
    uri: Uri
): Int

Adds a mapping between a string of text and a sound file. Use this to add custom earcons.

Parameters
earcon String: The name of the earcon. Example: "[tick]" This value cannot be null.
uri Uri: Uri object pointing to the sound file. This value cannot be null.
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

addEarcon

Added in API level 21
open fun addEarcon(
    earcon: String!, 
    file: File!
): Int

Adds a mapping between a string of text and a sound file. Use this to add custom earcons.

Parameters
earcon String!: The name of the earcon. Example: "[tick]"
file File!: File object pointing to the sound file.
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

addEarcon

Added in API level 4
Deprecated in API level 21
open fun addEarcon(
    earcon: String!, 
    filename: String!
): Int

Deprecated: As of API level 21, replaced by addEarcon(java.lang.String,java.io.File).

Adds a mapping between a string of text and a sound file. Use this to add custom earcons.

Parameters
earcon String!: The name of the earcon. Example: "[tick]"
filename String!: The full path to the sound file (for example: "/sdcard/mysounds/tick.wav")
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

addEarcon

Added in API level 4
open fun addEarcon(
    earcon: String!, 
    packagename: String!, 
    resourceId: Int
): Int

Adds a mapping between a string of text and a sound resource in a package. Use this to add custom earcons.

Parameters
earcon String!: The name of the earcon. Example: "[tick]"
packagename String!: the package name of the application that contains the resource. This can for instance be the package name of your own application. Example: "com.google.marvin.compass"
The package name can be found in the AndroidManifest.xml of the application containing the resource.

<manifest xmlns:android="..." package="com.google.marvin.compass">

resourceId Int: Example: R.raw.tick_snd
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

addSpeech

Added in API level 31
open fun addSpeech(
    text: CharSequence, 
    uri: Uri
): Int

Adds a mapping between a CharSequence (may be spanned with TtsSpans) and a sound file. Using this, it is possible to add custom pronounciations for a string of text. After a call to this method, subsequent calls to speak(java.lang.CharSequence,int,android.os.Bundle,java.lang.String) will play the specified sound resource if it is available, or synthesize the text it is missing.

Parameters
text CharSequence: The string of text. Example: "south_south_east" This value cannot be null.
uri Uri: Uri object pointing to the sound file. This value cannot be null.
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

addSpeech

Added in API level 21
open fun addSpeech(
    text: CharSequence!, 
    file: File!
): Int

Adds a mapping between a CharSequence (may be spanned with TtsSpans) and a sound file. Using this, it is possible to add custom pronounciations for a string of text. After a call to this method, subsequent calls to speak(java.lang.CharSequence,int,android.os.Bundle,java.lang.String) will play the specified sound resource if it is available, or synthesize the text it is missing.

Parameters
text CharSequence!: The string of text. Example: "south_south_east"
file File!: File object pointing to the sound file.
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

addSpeech

Added in API level 21
open fun addSpeech(
    text: CharSequence!, 
    packagename: String!, 
    resourceId: Int
): Int

Adds a mapping between a CharSequence (may be spanned with TtsSpans) of text and a sound resource in a package. After a call to this method, subsequent calls to speak(java.lang.CharSequence,int,android.os.Bundle,java.lang.String) will play the specified sound resource if it is available, or synthesize the text it is missing.

Parameters
text CharSequence!: The string of text. Example: "south_south_east"
packagename String!: Pass the packagename of the application that contains the resource. If the resource is in your own application (this is the most common case), then put the packagename of your application here.
Example: "com.google.marvin.compass"
The packagename can be found in the AndroidManifest.xml of your application.

<manifest xmlns:android="..." package="com.google.marvin.compass">

resourceId Int: Example: R.raw.south_south_east
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

addSpeech

Added in API level 4
open fun addSpeech(
    text: String!, 
    filename: String!
): Int

Adds a mapping between a string of text and a sound file. Using this, it is possible to add custom pronounciations for a string of text. After a call to this method, subsequent calls to speak(java.lang.CharSequence,int,android.os.Bundle,java.lang.String) will play the specified sound resource if it is available, or synthesize the text it is missing.

Parameters
text String!: The string of text. Example: "south_south_east"
filename String!: The full path to the sound file (for example: "/sdcard/mysounds/hello.wav")
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

addSpeech

Added in API level 4
open fun addSpeech(
    text: String!, 
    packagename: String!, 
    resourceId: Int
): Int

Adds a mapping between a string of text and a sound resource in a package. After a call to this method, subsequent calls to speak(java.lang.CharSequence,int,android.os.Bundle,java.lang.String) will play the specified sound resource if it is available, or synthesize the text it is missing.

Parameters
text String!: The string of text. Example: "south_south_east"
packagename String!: Pass the packagename of the application that contains the resource. If the resource is in your own application (this is the most common case), then put the packagename of your application here.
Example: "com.google.marvin.compass"
The packagename can be found in the AndroidManifest.xml of your application.

<manifest xmlns:android="..." package="com.google.marvin.compass">

resourceId Int: Example: R.raw.south_south_east
Return
Int Code indicating success or failure. See ERROR and SUCCESS.

areDefaultsEnforced

Added in API level 8
Deprecated in API level 21
open fun areDefaultsEnforced(): Boolean

Deprecated: Deprecated in Java.

Checks whether the user's settings should override settings requested by the calling application. As of the Ice cream sandwich release, user settings never forcibly override the app's settings.

getAvailableLanguages

Added in API level 21
open fun getAvailableLanguages(): MutableSet<Locale!>!

Query the engine about the set of available languages.

getDefaultEngine

Added in API level 8
open fun getDefaultEngine(): String!

Gets the package name of the default speech synthesis engine.

Return
String! Package name of the TTS engine that the user has chosen as their default.

getDefaultLanguage

Added in API level 18
Deprecated in API level 21
open fun getDefaultLanguage(): Locale!

Deprecated: As of API level 21, use getDefaultVoice().getLocale() (getDefaultVoice())

Returns a Locale instance describing the language currently being used as the default Text-to-speech language. The locale object returned by this method is NOT a valid one. It has identical form to the one in getLanguage(). Please refer to getLanguage() for more information.

Return
Locale! language, country (if any) and variant (if any) used by the client stored in a Locale instance, or null on error.

getDefaultVoice

Added in API level 21
open fun getDefaultVoice(): Voice!

Returns a Voice instance that's the default voice for the default Text-to-speech language.

Return
Voice! The default voice instance for the default language, or null if not set or on error.

getEngines

Added in API level 14
open fun getEngines(): MutableList<TextToSpeech.EngineInfo!>!

Gets a list of all installed TTS engines.

Return
MutableList<TextToSpeech.EngineInfo!>! A list of engine info objects. The list can be empty, but never null.

getFeatures

Added in API level 15
Deprecated in API level 21
open fun getFeatures(locale: Locale!): MutableSet<String!>!

Deprecated: As of API level 21, please use voices. In order to query features of the voice, call getVoices() to retrieve the list of available voices and Voice.getFeatures() to retrieve the set of features.

Queries the engine for the set of features it supports for a given locale. Features can either be framework defined, e.g. TextToSpeech.Engine.KEY_FEATURE_NETWORK_SYNTHESIS or engine specific. Engine specific keys must be prefixed by the name of the engine they are intended for. These keys can be used as parameters to TextToSpeech.speak(String, int, java.util.HashMap) and TextToSpeech.synthesizeToFile(String, java.util.HashMap, String). Features values are strings and their values must meet restrictions described in their documentation.

Parameters
locale Locale!: The locale to query features for.
Return
MutableSet<String!>! Set instance. May return null on error.

getLanguage

Added in API level 4
Deprecated in API level 21
open fun getLanguage(): Locale!

Deprecated: As of API level 21, please use getVoice().getLocale() (getVoice()).

Returns a Locale instance describing the language currently being used for synthesis requests sent to the TextToSpeech engine. In Android 4.2 and before (API <= 17) this function returns the language that is currently being used by the TTS engine. That is the last language set by this or any other client by a TextToSpeech.setLanguage call to the same engine. In Android versions after 4.2 this function returns the language that is currently being used for the synthesis requests sent from this client. That is the last language set by a TextToSpeech.setLanguage call on this instance. If a voice is set (by setVoice(android.speech.tts.Voice)), getLanguage will return the language of the currently set voice. Please note that the Locale object returned by this method is NOT a valid Locale object. Its language field contains a three-letter ISO 639-2/T code (where a proper Locale would use a two-letter ISO 639-1 code), and the country field contains a three-letter ISO 3166 country code (where a proper Locale would use a two-letter ISO 3166-1 code).

Return
Locale! language, country (if any) and variant (if any) used by the client stored in a Locale instance, or null on error.

getMaxSpeechInputLength

Added in API level 18
open static fun getMaxSpeechInputLength(): Int

Limit of length of input string passed to speak and synthesizeToFile.

See Also

    getVoice

    Added in API level 21
    open fun getVoice(): Voice!

    Returns a Voice instance describing the voice currently being used for synthesis requests sent to the TextToSpeech engine.

    Return
    Voice! Voice instance used by the client, or null if not set or on error.

    getVoices

    Added in API level 21
    open fun getVoices(): MutableSet<Voice!>!

    Query the engine about the set of available voices. Each TTS Engine can expose multiple voices for each locale, each with a different set of features.

    isLanguageAvailable

    Added in API level 4
    open fun isLanguageAvailable(loc: Locale!): Int

    Checks if the specified language as represented by the Locale is available and supported.

    Parameters
    loc Locale!: The Locale describing the language to be used.
    Return
    Int Code indicating the support status for the locale. See LANG_AVAILABLE, LANG_COUNTRY_AVAILABLE, LANG_COUNTRY_VAR_AVAILABLE, LANG_MISSING_DATA and LANG_NOT_SUPPORTED.

    isSpeaking

    Added in API level 4
    open fun isSpeaking(): Boolean

    Checks whether the TTS engine is busy speaking. Note that a speech item is considered complete once it's audio data has been sent to the audio mixer, or written to a file. There might be a finite lag between this point, and when the audio hardware completes playback.

    Return
    Boolean true if the TTS engine is speaking.

    playEarcon

    Added in API level 21
    open fun playEarcon(
        earcon: String!, 
        queueMode: Int, 
        params: Bundle!, 
        utteranceId: String!
    ): Int

    Plays the earcon using the specified queueing mode and parameters. The earcon must already have been added with addEarcon(java.lang.String,java.lang.String) or addEarcon(java.lang.String,java.lang.String,int). This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener) and using the Engine.KEY_PARAM_UTTERANCE_ID parameter.

    Parameters
    earcon String!: The earcon that should be played
    queueMode Int: QUEUE_ADD or QUEUE_FLUSH.
    params Bundle!: Parameters for the request. Can be null. Supported parameter names: Engine.KEY_PARAM_STREAM, Engine specific parameters may be passed in but the parameter keys must be prefixed by the name of the engine they are intended for. For example the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the engine named "com.svox.pico" if it is being used.
    Return
    Int ERROR or SUCCESS of queuing the playEarcon operation.

    playEarcon

    Added in API level 4
    Deprecated in API level 21
    open fun playEarcon(
        earcon: String!, 
        queueMode: Int, 
        params: HashMap<String!, String!>!
    ): Int

    Deprecated: As of API level 21, replaced by playEarcon(java.lang.String,int,android.os.Bundle,java.lang.String).

    Plays the earcon using the specified queueing mode and parameters. The earcon must already have been added with addEarcon(java.lang.String,java.lang.String) or addEarcon(java.lang.String,java.lang.String,int). This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener) and using the Engine.KEY_PARAM_UTTERANCE_ID parameter.

    Parameters
    earcon String!: The earcon that should be played
    queueMode Int: QUEUE_ADD or QUEUE_FLUSH.
    params HashMap<String!, String!>!: Parameters for the request. Can be null. Supported parameter names: Engine.KEY_PARAM_STREAM, Engine.KEY_PARAM_UTTERANCE_ID. Engine specific parameters may be passed in but the parameter keys must be prefixed by the name of the engine they are intended for. For example the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the engine named "com.svox.pico" if it is being used.
    Return
    Int ERROR or SUCCESS of queuing the playEarcon operation.

    playSilence

    Added in API level 4
    Deprecated in API level 21
    open fun playSilence(
        durationInMs: Long, 
        queueMode: Int, 
        params: HashMap<String!, String!>!
    ): Int

    Deprecated: As of API level 21, replaced by playSilentUtterance(long,int,java.lang.String).

    Plays silence for the specified amount of time using the specified queue mode. This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener) and using the Engine.KEY_PARAM_UTTERANCE_ID parameter.

    Parameters
    durationInMs Long: The duration of the silence.
    queueMode Int: QUEUE_ADD or QUEUE_FLUSH.
    params HashMap<String!, String!>!: Parameters for the request. Can be null. Supported parameter names: Engine.KEY_PARAM_UTTERANCE_ID. Engine specific parameters may be passed in but the parameter keys must be prefixed by the name of the engine they are intended for. For example the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the engine named "com.svox.pico" if it is being used.
    Return
    Int ERROR or SUCCESS of queuing the playSilence operation.

    playSilentUtterance

    Added in API level 21
    open fun playSilentUtterance(
        durationInMs: Long, 
        queueMode: Int, 
        utteranceId: String!
    ): Int

    Plays silence for the specified amount of time using the specified queue mode. This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener) and using the Engine.KEY_PARAM_UTTERANCE_ID parameter.

    Parameters
    durationInMs Long: The duration of the silence.
    queueMode Int: QUEUE_ADD or QUEUE_FLUSH.
    utteranceId String!: An unique identifier for this request.
    Return
    Int ERROR or SUCCESS of queuing the playSilentUtterance operation.

    setAudioAttributes

    Added in API level 21
    open fun setAudioAttributes(audioAttributes: AudioAttributes!): Int

    Sets the audio attributes to be used when speaking text or playing back a file.

    Parameters
    audioAttributes AudioAttributes!: Valid AudioAttributes instance.
    Return
    Int ERROR or SUCCESS.

    setEngineByPackageName

    Added in API level 8
    Deprecated in API level 15
    open fun setEngineByPackageName(enginePackageName: String!): Int

    Deprecated: This doesn't inform callers when the TTS engine has been initialized. TextToSpeech(android.content.Context,android.speech.tts.TextToSpeech.OnInitListener,java.lang.String) can be used with the appropriate engine name. Also, there is no guarantee that the engine specified will be loaded. If it isn't installed or disabled, the user / system wide defaults will apply.

    Sets the TTS engine to use.

    Parameters
    enginePackageName String!: The package name for the synthesis engine (e.g. "com.svox.pico")
    Return
    Int ERROR or SUCCESS.

    setLanguage

    Added in API level 4
    open fun setLanguage(loc: Locale!): Int

    Sets the text-to-speech language. The TTS engine will try to use the closest match to the specified language as represented by the Locale, but there is no guarantee that the exact same Locale will be used. Use isLanguageAvailable(java.util.Locale) to check the level of support before choosing the language to use for the next utterances. This method sets the current voice to the default one for the given Locale; getVoice() can be used to retrieve it.

    Parameters
    loc Locale!: The locale describing the language to be used.
    Return
    Int Code indicating the support status for the locale. See LANG_AVAILABLE, LANG_COUNTRY_AVAILABLE, LANG_COUNTRY_VAR_AVAILABLE, LANG_MISSING_DATA and LANG_NOT_SUPPORTED.

    setOnUtteranceCompletedListener

    Added in API level 4
    Deprecated in API level 15
    open fun setOnUtteranceCompletedListener(listener: TextToSpeech.OnUtteranceCompletedListener!): Int

    Deprecated: Use setOnUtteranceProgressListener(android.speech.tts.UtteranceProgressListener) instead.

    Sets the listener that will be notified when synthesis of an utterance completes.

    Parameters
    listener TextToSpeech.OnUtteranceCompletedListener!: The listener to use.
    Return
    Int ERROR or SUCCESS.

    setOnUtteranceProgressListener

    Added in API level 15
    open fun setOnUtteranceProgressListener(listener: UtteranceProgressListener!): Int

    Sets the listener that will be notified of various events related to the synthesis of a given utterance. See UtteranceProgressListener and TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID.

    Parameters
    listener UtteranceProgressListener!: the listener to use.
    Return
    Int ERROR or SUCCESS

    setPitch

    Added in API level 4
    open fun setPitch(pitch: Float): Int

    Sets the speech pitch for the TextToSpeech engine. This has no effect on any pre-recorded speech.

    Parameters
    pitch Float: Speech pitch. 1.0 is the normal pitch, lower values lower the tone of the synthesized voice, greater values increase it.
    Return
    Int ERROR or SUCCESS.

    setSpeechRate

    Added in API level 4
    open fun setSpeechRate(speechRate: Float): Int

    Sets the speech rate. This has no effect on any pre-recorded speech.

    Parameters
    speechRate Float: Speech rate. 1.0 is the normal speech rate, lower values slow down the speech (0.5 is half the normal speech rate), greater values accelerate it (2.0 is twice the normal speech rate).
    Return
    Int ERROR or SUCCESS.

    setVoice

    Added in API level 21
    open fun setVoice(voice: Voice!): Int

    Sets the text-to-speech voice.

    Parameters
    voice Voice!: One of objects returned by getVoices().
    Return
    Int ERROR or SUCCESS.

    shutdown

    Added in API level 4
    open fun shutdown(): Unit

    Releases the resources used by the TextToSpeech engine. It is good practice for instance to call this method in the onDestroy() method of an Activity so the TextToSpeech engine can be cleanly stopped.

    speak

    Added in API level 21
    open fun speak(
        text: CharSequence!, 
        queueMode: Int, 
        params: Bundle!, 
        utteranceId: String!
    ): Int

    Speaks the text using the specified queuing strategy and speech parameters, the text may be spanned with TtsSpans. This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener) and using the Engine.KEY_PARAM_UTTERANCE_ID parameter.

    Parameters
    text CharSequence!: The string of text to be spoken. No longer than getMaxSpeechInputLength() characters.
    queueMode Int: The queuing strategy to use, QUEUE_ADD or QUEUE_FLUSH.
    params Bundle!: Parameters for the request. Can be null. Supported parameter names: Engine.KEY_PARAM_STREAM, Engine.KEY_PARAM_VOLUME, Engine.KEY_PARAM_PAN. Engine specific parameters may be passed in but the parameter keys must be prefixed by the name of the engine they are intended for. For example the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the engine named "com.svox.pico" if it is being used.
    utteranceId String!: An unique identifier for this request.
    Return
    Int ERROR or SUCCESS of queuing the speak operation.

    speak

    Added in API level 4
    Deprecated in API level 21
    open fun speak(
        text: String!, 
        queueMode: Int, 
        params: HashMap<String!, String!>!
    ): Int

    Deprecated: As of API level 21, replaced by speak(java.lang.CharSequence,int,android.os.Bundle,java.lang.String).

    Speaks the string using the specified queuing strategy and speech parameters. This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener) and using the Engine.KEY_PARAM_UTTERANCE_ID parameter.

    Parameters
    text String!: The string of text to be spoken. No longer than getMaxSpeechInputLength() characters.
    queueMode Int: The queuing strategy to use, QUEUE_ADD or QUEUE_FLUSH.
    params HashMap<String!, String!>!: Parameters for the request. Can be null. Supported parameter names: Engine.KEY_PARAM_STREAM, Engine.KEY_PARAM_UTTERANCE_ID, Engine.KEY_PARAM_VOLUME, Engine.KEY_PARAM_PAN. Engine specific parameters may be passed in but the parameter keys must be prefixed by the name of the engine they are intended for. For example the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the engine named "com.svox.pico" if it is being used.
    Return
    Int ERROR or SUCCESS of queuing the speak operation.

    stop

    Added in API level 4
    open fun stop(): Int

    Interrupts the current utterance (whether played or rendered to file) and discards other utterances in the queue.

    Return
    Int ERROR or SUCCESS.

    synthesizeToFile

    Added in API level 30
    open fun synthesizeToFile(
        text: CharSequence, 
        params: Bundle, 
        fileDescriptor: ParcelFileDescriptor, 
        utteranceId: String
    ): Int

    Synthesizes the given text to a ParcelFileDescriptor using the specified parameters. This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener).

    Parameters
    text CharSequence: The text that should be synthesized. No longer than getMaxSpeechInputLength() characters. This value cannot be null.
    params Bundle: Parameters for the request. Engine specific parameters may be passed in but the parameter keys must be prefixed by the name of the engine they are intended for. For example the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the engine named "com.svox.pico" if it is being used. This value cannot be null.
    fileDescriptor ParcelFileDescriptor: ParcelFileDescriptor to write the generated audio data to. This value cannot be null.
    utteranceId String: An unique identifier for this request. This value cannot be null.
    Return
    Int ERROR or SUCCESS of queuing the synthesizeToFile operation.

    synthesizeToFile

    Added in API level 21
    open fun synthesizeToFile(
        text: CharSequence!, 
        params: Bundle!, 
        file: File!, 
        utteranceId: String!
    ): Int

    Synthesizes the given text to a file using the specified parameters. This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener).

    Parameters
    text CharSequence!: The text that should be synthesized. No longer than getMaxSpeechInputLength() characters.
    params Bundle!: Parameters for the request. Cannot be null. Engine specific parameters may be passed in but the parameter keys must be prefixed by the name of the engine they are intended for. For example the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the engine named "com.svox.pico" if it is being used.
    file File!: File to write the generated audio data to.
    utteranceId String!: An unique identifier for this request.
    Return
    Int ERROR or SUCCESS of queuing the synthesizeToFile operation.

    synthesizeToFile

    Added in API level 4
    Deprecated in API level 21
    open fun synthesizeToFile(
        text: String!, 
        params: HashMap<String!, String!>!, 
        filename: String!
    ): Int

    Deprecated: As of API level 21, replaced by synthesizeToFile(java.lang.CharSequence,android.os.Bundle,java.io.File,java.lang.String).

    Synthesizes the given text to a file using the specified parameters. This method is asynchronous, i.e. the method just adds the request to the queue of TTS requests and then returns. The synthesis might not have finished (or even started!) at the time when this method returns. In order to reliably detect errors during synthesis, we recommend setting an utterance progress listener (see setOnUtteranceProgressListener) and using the Engine.KEY_PARAM_UTTERANCE_ID parameter.

    Parameters
    text String!: The text that should be synthesized. No longer than getMaxSpeechInputLength() characters.
    params HashMap<String!, String!>!: Parameters for the request. Cannot be null. Supported parameter names: Engine.KEY_PARAM_UTTERANCE_ID. Engine specific parameters may be passed in but the parameter keys must be prefixed by the name of the engine they are intended for. For example the keys "com.svox.pico_foo" and "com.svox.pico:bar" will be passed to the engine named "com.svox.pico" if it is being used.
    filename String!: Absolute file filename to write the generated audio data to.It should be something like "/sdcard/myappsounds/mysound.wav".
    Return
    Int ERROR or SUCCESS of queuing the synthesizeToFile operation.