我的service是常駐service 在service裡定義一個常量 int count =0;

  public void showNotification(String nearestMinor){
       Notification.Builder builder = new Notification.Builder(this);
       Intent mIntent = new Intent(this, TatgetActivity.class);
       Bundle bundle=new Bundle();
       bundle.putInt("count",1);
       mIntent.putExtras(bundle);

       PendingIntent pendingIntent = PendingIntent.getActivity(this, count, mIntent, Intent.FLAG_ACTIVITY_CLEAR_TOP);
       builder.setContentIntent(pendingIntent);
       builder.setSmallIcon(R.drawable.default_face);
       builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.default_face));
       builder.setAutoCancel(true);
       builder.setContentTitle("懸掛式通知");
       builder.setVisibility(Notification.VISIBILITY_SECRET);
       builder.setContentText("nearestMinor="+nearestMinor);
       //設定點選跳轉
//        Intent hangIntent = new Intent();
//        hangIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//        hangIntent.setClass(this, TestActivity.class);
       //如果描述的PendingIntent已經存在，則在產生新的Intent之前會先取消掉當前的
       PendingIntent hangPendingIntent = PendingIntent.getActivity(this, 0, mIntent, PendingIntent.FLAG_CANCEL_CURRENT);
       builder.setFullScreenIntent(hangPendingIntent, true);

       NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
       nm.notify(0, builder.build());
       count++;
   }
 

據說

Intent.FLAG_ACTIVITY_CLEAR_TOP

感謝這個哥們的demo！！！

http://blog.csdn.net/itachi85/article/details/50096609