在setAlarm方法期間調用的Alarm BroadcastReceiver的onReceive（）被調用

Question

新手在這里，我有這個功能setAlarm ：

 public void setAlarm(){


        SharedPreferences sa=PreferenceManager.getDefaultSharedPreferences(getBaseContext());


        int hr=sa.getInt("alarmhour", 6);
        int mn=sa.getInt("alarmminute", 0);
        String st1=sa.getString("alarmstatus", "Alarm Disabled");

        if(st1.equals("Alarm Enabled"))
        {

        AlarmManager ala = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        Intent inte = new Intent(this, epicalarm.class);
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, inte, 0);


        Calendar time = Calendar.getInstance();
        time.set(Calendar.HOUR_OF_DAY, hr);
        time.set(Calendar.MINUTE, mn);
        time.set(Calendar.SECOND, 0);

        ala.set(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(), pi);
        }




 }

每次我調用setAlarm函數時，都會調用onReceive方法並顯示警報。 為什么？

Answer 1

Calendar calendar = Calendar.getInstance();   
calendar.setTimeInMillis(System.currentTimeMillis());       
calendar.set(Calendar.HOUR_OF_DAY, h);        
calendar.set(Calendar.MINUTE, m);        
calendar.set(Calendar.SECOND, 0);        
calendar.set(Calendar.MILLISECOND,0);
// if values of h and m are less than current time
//then 'if' block will executes and adds the amount of days as 1 to your calendar object.
if (calendar.before(Calendar.getInstance()))
{
     calendar.add(Calendar.DATE, 1);
}

//you will get an alarm` after a day instead of now

ala.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pi);

Answer 2

中的第二個參數

ala.set(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(), pi);

指定何時首先觸發警報。 在您的代碼中，您將在從共享的首選項中讀取信息時觸發它。 如果已經過去了，警報將立即觸發。 這可能是調用onReceive（）方法的原因之一。

檢查您閱讀的時間是否是將來的某個時間。