tts 检测说话完毕

public class TTSActivity extends Activity implements 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);    } } // It's callback public void onUtteranceCompleted(String utteranceId) {    Log.i(TAG, utteranceId);    } ........... }