Android tts programming

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AI Overview
To implement Text-to-Speech (TTS) programming on Android, you need to create a TextToSpeech object, initialize it, and implement TextToSpeech.OnInitListener to ensure the engine is ready before use. Once initialized, you can call the speak() method with your desired text. For advanced control, you can set up callbacks with UtteranceProgressListener to monitor the speech process and trigger actions when it starts or finishes.
1. Initialize the TextToSpeech Object

    Create an instance:
    In your Activity's onCreate() method, create a TextToSpeech object, providing the application context and an instance of TextToSpeech.OnInitListener.

Implement OnInitListener:
Your Activity should implement this interface and override the onInit(int status) method.
Check initialization status:
Inside onInit(), check if the status is TextToSpeech.SUCCESS to confirm the engine is ready.

1. // Example Kotlin code for initializing TTS
   
2. class MainActivity : AppCompatActivity(), TextToSpeech.OnInitListener {
   
3. 
   
4.     private lateinit var textToSpeech: TextToSpeech
   
5. 
   
6.     override fun onCreate(savedInstanceState: Bundle?) {
   
7.         super.onCreate(savedInstanceState)
   
8.         setContentView(R.layout.activity_main)
   
9. 
   
10.         textToSpeech = TextToSpeech(this, this) // 'this' is the activity, which implements OnInitListener
    
11.     }
    
12. 
    
13.     override fun onInit(status: Int) {
    
14.         if (status == TextToSpeech.SUCCESS) {
    
15.             // TTS engine is ready. You can now set the language and speak.
    
16.             val result = textToSpeech.setLanguage(Locale.US) // Example: Set language to US English
    
17.             if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) {
    
18.                 Log.e("TTS", "Language not supported or missing data")
    
19.             } else {
    
20.                 // Language set successfully, enable speaking features if needed
    
21.             }
    
22.         } else {
    
23.             Log.e("TTS", "Initialization failed")
    
24.         }
    
25.     }
    
26. }

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2. Speak Text

    Call speak():
    Once the onInit() method confirms success and you've set a language, you can use the speak() method.

Provide parameters:
The speak() method takes three main parameters:

    text: The string of text to be spoken.

queueMode: A strategy for handling queues of speech requests. Common options are TextToSpeech.QUEUE_FLUSH (clears the queue before speaking) or TextToSpeech.QUEUE_ADD (adds to the end of the queue).
utteranceId: An optional string ID for the specific utterance, used for tracking.

1. // Example of speaking text
   
2. fun speakOut(text: String) {
   
3.     if (textToSpeech.isSpeaking) {
   
4.         textToSpeech.stop()
   
5.     }
   
6.     textToSpeech.speak(text, TextToSpeech.QUEUE_FLUSH, null, "utteranceId1")
   
7. }

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3. Handle Callbacks (Advanced)

    Set UtteranceProgressListener:
    To get notified when speaking starts, stops, or encounters an error, set an UtteranceProgressListener.
    Implement methods:
    Implement onStart(), onDone(), and onError() within your listener. These methods receive the utteranceId to help identify the specific speech request.

1. // Example of setting an UtteranceProgressListener
   
2. textToSpeech.setOnUtteranceProgressListener(object : UtteranceProgressListener() {
   
3.     override fun onDone(utteranceId: String?) {
   
4.         Log.i("TTS", "Speech completed for: $utteranceId")
   
5.         // You can trigger another action here, like showing an ad
   
6.     }
   
7. 
   
8.     override fun onError(utteranceId: String?) {
   
9.         Log.e("TTS", "Error during speech for: $utteranceId")
   
10.     }
    
11. 
    
12.     override fun onStart(utteranceId: String?) {
    
13.         Log.i("TTS", "Speech started for: $utteranceId")
    
14.     }
    
15. })

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ref:  https://proandroiddev.com/master ... cda?gi=73c2c30c4b81
https://medium.com/@vedantkingh/ ... voices-fe4e6ead2368