如何爲Blackberry中的ListField設置字段更改偵聽器？

Question

我是新的黑莓..我需要一些幫助。如何SetFieldChangeListener在ListField在黑莓？

Answer 1

這樣：

yourListField.setChangeListener(fieldChangeListenerInterfaceImplementation); 

實施FieldChangeListener和實現的實例傳遞給setChangeListener();

Answer 2

listField = new ListField() { 
     protected boolean invokeAction(int action) { 
     UiApplication.getUiApplication().invokeLater(new Runnable() { 
      public void run() { 

        <** apply your code here **>      

        } 
       }); 
       return true; 
      }; 

      public void focusChangeNotify(int index) { 
       mainlist = listField.getSelectedIndex(); 
       listField.invalidate(); 
       super.focusChangeNotify(index); 
      }; 

      protected void onUnfocus() { 
       mainlistflag = true; 
       listField.invalidate(); 
       super.onUnfocus(); 
      }; 

      protected void onFocus(int direction) { 

       mainlistflag = false; 
       super.onFocus(direction); 

      }; 
     };