Java events and listeners, several events in one class

Question

I am new to android / java and am currently trying to learn user events and listeners. I am currently using this code that works successfully. Now I want to add another event to the DataRobot. The event will be triggered when a certain part of the data is analyzed using the analysisData function. I was wondering if anyone can show me how to implement two events in this class? I use this event to fire AlarmDialog. So, if there is a better way, let me know.

/* SmartApp.java */
public class SmartApp extends Activity 
{
    private ConnectDevice cD = new ConnectDevice();
    private DataRobot dR = new DataRobot();
    private DataBuilder dB = new DataBuilder();
    private DataSender dS = new DataSender();
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.intro);

    cD.addDataReceivedListener(new DataReceivedListener() {
        @Override
        public void dataReceivedReceived(DataReceivedEvent event) {
            // TODO Auto-generated method stub
            dR.analyzeData(event.getData());
        }
    });
    dR.addDataAnalyzedListener(new DataAnalyzedListener() {
        @Override
        public void dataAnalyzedReceived(DataAnalyzedEvent event) {
            // TODO Auto-generated method stub
            dB.submitData(event.getData());
        }
    });
    dB.addDataBuilderListener(new DataBuilderListener() {
        @Override
        public void dataBuilderReceived(DataBuilderEvent event) {
            // TODO Auto-generated method stub
            dS.sendData(event.getData());
        }
    });
      }
}  

---

/* DataRobot.java */
public class DataRobot {
    /* This class is for analyzing the data */
    private List _listeners = new ArrayList();
    private String data;
    public boolean analyzeData(String temp) {
        /* Analyze the data
         * This function analyzes the data, as explained in the OP
         * This function fires the analyzed data event when finished
             * analyzing the data.
         */
        data = temp;
        fireDataAnalyzedEvent(data); // this fires the dataanalyzedevent
        return true; //for now this will always return true
    }

    public synchronized void addDataAnalyzedListener(DataAnalyzedListener listener) {
        _listeners.add(listener);
    }
    public synchronized void removeDataAnalyzedListener(DataAnalyzedListener listener) {
        _listeners.remove(listener);
    }
    private synchronized void fireDataAnalyzedEvent(String temp) {
        DataAnalyzedEvent dRE = new DataAnalyzedEvent(this, temp);
        Iterator listeners = _listeners.iterator();
        while(listeners.hasNext()) {
            ((DataAnalyzedListener)listeners.next()).dataAnalyzedReceived(dRE);
        }
    }
    public interface DataAnalyzedListener {
        public void dataAnalyzedReceived(DataAnalyzedEvent event);
    }
}  

---

/* DataReceivedEvent.java */
public class DataReceivedEvent extends EventObject{
    private String data;
    public DataReceivedEvent(Object source, String temp) {
        super(source);
        // TODO Auto-generated constructor stub
        data = temp;
    }
    public String getData() {
            // this function is just an accessor function
        return data;
    }
}  

---

/* DataAnalyzedEvent.java */
public class DataAnalyzedEvent extends EventObject{
    private String data;
    public DataAnalyzedEvent(Object source, String temp) {
        super(source);
        // TODO Auto-generated constructor stub
        data = temp;
    }
    public String getData() {
            // this function is just an accessor function
        return data;
    }
}  

Answer 1

, , . , , DataAnalyzedListener.

, . .

:

, . foreach .

private List<DataAnalyzedListener> _listeners = new ArrayList<DataAnalyzedListener>();

for (DataAnalyzedListener listener : _listeners) {
  listener.dataAnalyzedReceived(dRE);
}

Answer 2

Android. . : - . Intent Filter - Intent, - context.startActivity(Intent) Intent (pub/sub eventing), Android.