android - 将通知与秒表一起使用

Question

我在通知/状态栏中使用秒表。

• contentText 我得到秒表getFormattedElapsedTime()。它工作但在我关闭应用程序时停止。即使应用程序关闭，我该如何工作？

  private NotificationManager m_notificationMgr;
  private Notification m_notification;
     // Timer to update the ongoing notification
   private final long mFrequency = 100;    // milliseconds
      private final int TICK_WHAT = 2; 
      private Handler mHandler = new Handler() {
          public void handleMessage(Message m) {
              updateNotification();
              sendMessageDelayed(Message.obtain(this, TICK_WHAT), mFrequency);
          }
      };
  
      @Override
      public void onCreate() {
          super.onCreate();
          Log.d(TAG, "created");
  
          m_stopwatch = new Stopwatch();
          m_notificationMgr = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
  
          createNotification();
      }
  
  
  public void createNotification() {
          Log.d(TAG, "creating notification");
  
  
          int icon = R.drawable.icon;
          CharSequence tickerText = "Meb";
          long when = System.currentTimeMillis();
  
          m_notification = new Notification(icon, tickerText, when);
          m_notification.flags |= Notification.FLAG_ONGOING_EVENT;
          m_notification.flags |= Notification.FLAG_NO_CLEAR;
      }
  
      public void updateNotification() {
          // Log.d(TAG, "updating notification");
  
          Context context = getApplicationContext();
          CharSequence contentTitle = "Mebr";
          CharSequence contentText = getFormattedElapsedTime();
  
          Intent notificationIntent = new Intent(this, TimerFragmentActivity.class);
          PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
  
          // the next two lines initialize the Notification, using the configurations above
          m_notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
          m_notificationMgr.notify(NOTIFICATION_ID, m_notification);
      }
  
      public void showNotification() {
          Log.d(TAG, "showing notification");
  
          updateNotification();       
          mHandler.sendMessageDelayed(Message.obtain(mHandler, TICK_WHAT), mFrequency);
      }
  
      public void hideNotification() {
          Log.d(TAG, "removing notification");
  
          m_notificationMgr.cancel(NOTIFICATION_ID);
          mHandler.removeMessages(TICK_WHAT);
      }
  

Answer 1

您需要从Service更新您的通知，即使在活动暂停或停止后也可以继续运行。