/**
* Initializes the ASR and TTS engines. @Note: It is not possible to do it in a constructor
* because we cannot get the context for recognition before oncreate
*/
public void initializeAsrTts() {
// Initialize text to speech
myTts = TTS.getInstance(getApplicationContext());
// Initialize the speech recognizer
createRecognizer(getApplicationContext());
}
/**
* Synthesizes a prompt. If it is not possible, it creates a toast with the content of the message
*/
private void playPrompt(String prompt) {
try {
myTts.speak(prompt, "EN");
} catch (Exception e) {
Toast.makeText(this, prompt, Toast.LENGTH_LONG).show();
Log.e(LOGTAG, "English not available for TTS, default language used instead");
}
}
/**
* Provides feedback to the user (by means of a Toast and a synthesized message) when the ASR
* encounters an error
*
* <p>If the error is a nomatch or no input, then interprets the field again (asks the user again
* for the same information) If not, the dialog is stopped.
*
* <p>CHANGED WITH RESPECT TO FORMFILLLIB (chapter 5) Changes: - before starting to interpret the
* current field again, it checks whether it has been filled in the GUI
*/
@Override
public void processAsrError(int errorCode) {
String errorMessage;
switch (errorCode) {
case SpeechRecognizer.ERROR_AUDIO:
errorMessage = "Audio recording error";
break;
case SpeechRecognizer.ERROR_CLIENT:
errorMessage = "Client side error";
break;
case SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS:
errorMessage = "Insufficient permissions";
break;
case SpeechRecognizer.ERROR_NETWORK:
errorMessage = "Network related error";
break;
case SpeechRecognizer.ERROR_NETWORK_TIMEOUT:
errorMessage = "Network operation timeout";
break;
case SpeechRecognizer.ERROR_RECOGNIZER_BUSY:
errorMessage = "RecognitionServiceBusy";
break;
case SpeechRecognizer.ERROR_SERVER:
errorMessage = "Server sends error status";
break;
case SpeechRecognizer.ERROR_NO_MATCH:
errorMessage = nomatch; // Error message obtained from the VXML file
break;
case SpeechRecognizer.ERROR_SPEECH_TIMEOUT:
errorMessage = noinput; // Error message obtained from the VXML file
break;
default:
errorMessage = "ASR error";
break;
}
try {
myTts.speak(errorMessage, "EN");
} catch (Exception e) {
Log.e(LOGTAG, "English not available for TTS, default language used instead");
}
if (errorCode == SpeechRecognizer.ERROR_NO_MATCH
|| errorCode == SpeechRecognizer.ERROR_SPEECH_TIMEOUT) {
// If there is a nomatch or noinput, interprets the field again.
if (form.getField(currentPosition).isFilled())
moveToNextField(); // Necessary for multimodal apps
// in which the field can be filled in the GUI while the oral dialog tries to prompt again for
// the information
else interpretCurrentField();
} else {
// If there is an error, shows feedback to the user and writes it in the log
Log.e(LOGTAG, "Error: " + errorMessage);
Toast.makeText(this, errorMessage, Toast.LENGTH_LONG).show();
}
}
// TODO
public void shutdownTts() {
myTts.shutdown();
}
