import android.location.GpsStatus.NmeaListener; //导入依赖的package包/类
/**
 * Notifies the reception of a NMEA sentence from the bluetooth GPS to registered NMEA listeners.
 * 
 * @param nmeaSentence  the complete NMEA sentence received from the bluetooth GPS (i.e. $....*XY where XY is the checksum)
 */
private void notifyNmeaSentence(final String nmeaSentence){
  if (enabled){
    //    Log.v(LOG_TAG, "parsing and notifying NMEA sentence: "+nmeaSentence);
    String sentence = null;
    try {
      sentence = parser.parseNmeaSentence(nmeaSentence);
    } catch (SecurityException e){
          Log.e(LOG_TAG, "error while parsing NMEA sentence: "+nmeaSentence, e);
      // a priori Mock Location is disabled
      sentence = null;
      disable(R.string.msg_mock_location_disabled);
    }
    final String recognizedSentence = sentence;
    final long timestamp = System.currentTimeMillis();
    if (recognizedSentence != null){
      Log.v(LOG_TAG, "notifying NMEA sentence: "+recognizedSentence);
      synchronized(nmeaListeners) {
        for(final NmeaListener listener : nmeaListeners){
          notificationPool.execute(new Runnable(){
            @Override
            public void run() {
              listener.onNmeaReceived(timestamp, recognizedSentence);
            }          
          });
        }
      }
    }
  }
}
 

import android.location.GpsStatus.NmeaListener; //导入依赖的package包/类
/**
 * Adds a NMEA listener.
 * In fact, it delegates to the NMEA parser. 
 * 
 * @see NmeaParser#addNmeaListener(NmeaListener)
 * @param listener  a {@link NmeaListener} object to register
 * @return  true if the listener was successfully added
 */
public boolean addNmeaListener(NmeaListener listener){
  if (!nmeaListeners.contains(listener)){
        Log.d(LOG_TAG, "adding new NMEA listener");
    nmeaListeners.add(listener);
  }
  return true;
}
 

import android.location.GpsStatus.NmeaListener; //导入依赖的package包/类
/**
 * Removes a NMEA listener.
 * In fact, it delegates to the NMEA parser. 
 * 
 * @see NmeaParser#removeNmeaListener(NmeaListener)
 * @param listener  a {@link NmeaListener} object to remove 
 */
public void removeNmeaListener(NmeaListener listener){
      Log.d(LOG_TAG, "removing NMEA listener");
  nmeaListeners.remove(listener);
}