How To Popup Alarm Message Without Any Activity In Background?

In my android i app i can alarm functionality and as well logout functionality. After setting my alarm time i am exiting the app by clicking the logout button. I am using

Solution 1:

You should use Alarm Manager to set alarms in Android. The alarm manager holds your alarm and fire an pending intent on alarm time.

First create a pending intent like this :

pendingIntent = PendingIntent.getService(CONTEXT, ALARM_ID,  INTENT_TO_LAUNCH, 0);

Then use this pending intent to set an Alarm like this :

 AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
 alarmManager.set(AlarmManager.RTC_WAKEUP, ALARM_TIME, pendingIntent);

This will start the pending intent at given time.

To remove an alarm you have to recreate the same Pending Intent with same ALARM_ID :

 alarmManager.cancel(pendingIntent);

Solution 2:

First create a pending intent like this :

pendingIntent = PendingIntent.getService(context, alarm_id, Pass your data with intent,  PendingIntent.FLAG_UPDATE_CURRENT);

Set an Alarm like this :

 AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        //19 4.4and above api level
        am.setExact(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis() + AlarmManager.INTERVAL_DAY, sender);
 } else {
        //below 19 4.4
        am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis() + AlarmManager.INTERVAL_DAY, sender);
 }

This will start the pending intent at given time.

To remove an alarm you have to Use the same Pending Intent with same ALARM_ID:

am.cancel(pendingIntent);

Now You need to create One Service to catch your Alarm.