TimerPickerDialog 中 onTimeSet 执行两次的问题

开发android小闹钟的程序时，在添加闹钟时闹钟列表中总是出现两个相同的闹钟。

 btnAddAlarm.setOnClickListener(new View.OnClickListener() {

             @Override
             public void onClick(View v) {
                 if(tpd == null){
                     addAlarm();
                 }

                 tpd.show();
             }
         });
 private void addAlarm() {

         TimePickerDialog.OnTimeSetListener otsl = new OnTimeSetListener() {

             @Override
             public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                 Calendar setTime = Calendar.getInstance();
                 setTime.set(Calendar.HOUR_OF_DAY, hourOfDay);
                 setTime.set(Calendar.MINUTE, minute);
                 setTime.set(Calendar.SECOND,0);
                 setTime.set(Calendar.MILLISECOND, 0);

                 Calendar currentTime = Calendar.getInstance();

                 if (setTime.getTimeInMillis() <= currentTime.getTimeInMillis()) {
                     setTime.setTimeInMillis(setTime.getTimeInMillis()+ 24 * 60 * 60 * 1000);
                 }

                 adapter.add(new AlarmData(setTime.getTimeInMillis()));

                 alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
                         setTime.getTimeInMillis(), 5 * 60 * 1000,
                         PendingIntent.getBroadcast(getContext(),
                                 new AlarmData(setTime.getTimeInMillis()).getId(),
                                 new Intent(getContext(),
                                         AlarmReceiver.class), 0));

                 saveAlarmList();

             }
         };

         Calendar c = Calendar.getInstance();
         int hourOfDay = c.get(Calendar.HOUR_OF_DAY);
         int min = c.get(Calendar.MINUTE);
         tpd = new TimePickerDialog(getContext(), otsl, hourOfDay, min, true);
     }

刚开始以为是adapter的问题，于是在初始化函数中加了添加闹钟的代码，结果只有一个闹钟。最后确定是TimePickerDialog的问题，上网查找才知道这是android4.1和4.2的bug，需要重写TimePickerDialog中的onStop方法，把onStop()中super.onStop()注释掉就行了

 tpd = new TimePickerDialog(getContext(), otsl, hourOfDay, min, true){
             @Override
             protected void onStop() {
                 //super.onStop();
             }
         };