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();
            }
        };