android – 在新电子邮件到达时未通知MessageCountListener的服务

我已经实现了一个服务,它可以检索收件箱并实现MessageCountListener接口,用于收听新的电子邮件到达.但是在新的电子邮件到达时,它不会收到通知！可能是什么原因以及还有什么可以做？这是代码： public class EmailRetreiverService extends Service implements MessageCountListener{ public static final Vector v=new Vector(); public static final Vector nwmsg=new Vector(); Message[] m=null; @Override public IBinder onBind(Intent intent) { // TODO Auto-generated method stub return null; } @Override public void onCreate(){ Log.d("EmailRetreiverStarted"," "); ConvertToSmtp cts=new ConvertToSmtp("myemail@gmail.com","mypassword"," "," "," ", " "); Folder folder=cts.retreiveInbox(); try { m=folder.getMessages(); } catch (MessagingException e) { // TODO Auto-generated catch block e.printStackTrace(); } for(int i=0;i<m.length;i++){ v.add(m[i]); } Log.d("EmailRetreiverMessageCount",new Integer(m.length).toString()); Collections.reverse(v); /*folder.addMessageCountListener(new MessageCountAdapter(){ public void messagesAdded(MessageCountEvent ev) { Log.d("MessageListener","message listner invoked."); Message[] msgs = ev.getMessages(); TTSservice.say("Attention! "+msgs.length+" new messages have arrived now.Kindly retreive inbox again!"); Collections.reverse(v); for (int i = 0; i < msgs.length; i++) { v.add(msgs[i]); //System.out.println("Got " + msgs.length + " new messages"); } Collections.reverse(v); // Just dump out the new messages } });*/ folder.addMessageCountListener(this); } @Override public void onDestroy(){ v.removeAllElements(); } @Override public void messagesAdded(MessageCountEvent arg0) { // TODO Auto-generated method stub Log.d("EmailService","MessageArrived!"); } @Override public void messagesRemoved(MessageCountEvent arg0) { // TODO Auto-generated method stub Log.d("EmailService","MessageRemoved!"); } }必须注意的是,该服务已成功检索收件箱.但是没有得到通知.