How to know when TTS is finished?

by 
public class TTSActivity extends Activity implements OnInitListener, OnUtteranceCompletedListener, ... {
private TextToSpeech mTts;
...........
private void speak(String text) {
   if(text != null) {
      HashMap<String, String> myHashAlarm = new HashMap<String, String>();
      myHashAlarm.put(TextToSpeech.Engine.KEY_PARAM_STREAM, String.valueOf(AudioManager.STREAM_ALARM));
      myHashAlarm.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, "SOME MESSAGE");
      mTts.speak(text, TextToSpeech.QUEUE_FLUSH, myHashAlarm);
   }
}
// Fired after TTS initialization
public void onInit(int status) {
    if(status == TextToSpeech.SUCCESS) {
        mTts.setOnUtteranceCompletedListener(this);
    }
}
// It's callback
public void onUtteranceCompleted(String utteranceId) {
   Log.i(TAG, utteranceId); //utteranceId == "SOME MESSAGE"
   }
...........
}

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