UtteranceProgressListener

Called when an utterance has successfully completed processing. All audio will have been played back by this point for audible output, and all output will have been written to disk for file synthesis requests. This request is guaranteed to be called after onStart(String).

Called when an error has occurred during processing. This can be called at any point in the synthesis process. Note that there might be calls to onStart(String) for specified utteranceId but there will never be a call to both onDone(String) and onError(String) for the same utterance.

Called when an error has occurred during processing. This can be called at any point in the synthesis process. Note that there might be calls to onStart(String) for specified utteranceId but there will never be a call to both onDone(String) and onError(String, int) for the same utterance. The default implementation calls onError(String).

Called when an utterance "starts" as perceived by the caller. This will be soon before audio is played back in the case of a speak(CharSequence, int, Bundle, String) or before the first bytes of a file are written to storage in the case of synthesizeToFile(CharSequence, Bundle, File, String).

Called when an utterance has been stopped while in progress or flushed from the synthesis queue. This can happen if a client calls stop() or uses QUEUE_FLUSH as an argument with the speak(CharSequence, int, Bundle, String) or synthesizeToFile(CharSequence, Bundle, File, String) methods.