java事件和监听器，一个类中的多个事件

Question

我是新来的android/java，目前正在尝试学习自定义事件和侦听器。我目前已经在下面实现了这个代码，它正在成功运行。我现在想向DataRobot添加另一个事件。使用analyzeData函数分析某个数据段时，会触发该事件。我想知道是否有人能告诉我如何在这个课程中实施两个活动？我正在使用此事件来触发AlarmDialog。所以，如果有更好的方法，让我知道。

/* 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

如何添加，如果两个事件有关的第二事件取决于。如果一个物体想要听这两个事件，那么就像向你的DataAnalyzedListener接口添加另一种方法一样简单。

另一种情况是事件不相关，对象将要订阅一个事件或另一个事件。在这种情况下，您将需要创建两个独立的接口并拥有两个侦听器列表。

其他意见：

使用参数化的列表，而不是裸露的类型，你会不会需要转换的对象。 也可以使用foreach循环，而不是直接抓取迭代器。

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

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

Answer 2

我会重新设计Android。使用服务并注册它以接收具有某些操作类型的Intents。以这种方式来看待：意图就是你的事件。意图过滤器是你的意图映射，事件管理器是通过调用context.startActivity（Intent）或者通过广播Intent（pub/sub eventing）这就是Android的方式。