Fire notification at every 24 hours and at exact time of 8 AM

Question

I am using AlarmManager() to fire notification and repeat it at every 24 hours.

My code is on onCreate() in Splash Activity which fires fi

Answer 1

Here is pseudocode :

You have to write this code inside your Splash.java

Step 1 : Is_Alarm_Set(); [Boolean]

Step 2 : false [step 3]

Step 2 : true [step 8] (No need to set)

Step 3 : Get_Time() [User's Current Mobile Time]

Step 4 : Find_Time_Difference() [This function will find difference between user's mobile time and your Fix Time (8AM).]

Step 5 : Now set your alarm as per time difference.[i.e current time is 7 pm and date is 1-june then set alarm of 8 AM for next day.]

Step 6 : Set your repetition days setRepeating()

Step 7 : It will fire alarm as per your fix time 8 AM.

Step 8 : Switch Your Activity.

Answer 2

Appu answer helped me a lot but if you want a fixed version of it a bit more readable and shorted look at this:

PendingIntent pendingIntent = PendingIntent.getBroadcast(Splash.this, 0, myIntent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar firingCal= Calendar.getInstance();
Calendar currentCal = Calendar.getInstance();

firingCal.set(Calendar.HOUR_OF_DAY, 8); // At the hour you wanna fire
firingCal.set(Calendar.MINUTE, 0); // Particular minute
firingCal.set(Calendar.SECOND, 0); // particular second

if(firingCal.compareTo(currentCal) < 0) { 
   firingCal.add(Calendar.DAY_OF_MONTH, 1);
} 
Long intendedTime = firingCal.getTimeInMillis();
alarmManager.setRepeating(AlarmManager.RTC, intendedTime , AlarmManager.INTERVAL_DAY, pendingIntent);

Answer 3

// Retrieve a PendingIntent that will perform a broadcast
            Intent alarmIntent = new Intent(HomeContactActivity.this,
                    AlarmReceiver.class);
            pendingIntent = PendingIntent.getBroadcast(
                    HomeContactActivity.this, 0, alarmIntent, 0);

            AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

            // Set the alarm to start at 10:00 AM
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.set(Calendar.HOUR_OF_DAY, 10);
            calendar.set(Calendar.MINUTE, 0);
            calendar.set(Calendar.SECOND, 0);




            manager.setRepeating(AlarmManager.RTC_WAKEUP,
                    calendar.getTimeInMillis(), 86400000, // for repeating
                                                            // in every 24
                                                            // hours
                    pendingIntent);

Answer 4

Do as chintan suggested. To get a clear picture, the exact solution might look something similar to the below:

Intent myIntent = new Intent(Splash.this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(Splash.this, 0, myIntent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

Calendar firingCal= Calendar.getInstance();
Calendar currentCal = Calendar.getInstance();

firingCal.set(Calendar.HOUR, 8); // At the hour you wanna fire
firingCal.set(Calendar.MINUTE, 0); // Particular minute
firingCal.set(Calendar.SECOND, 0); // particular second

long intendedTime = firingCal.getTimeInMillis();
long currentTime = currentCal.getTimeInMillis();

if(intendedTime >= currentTime){ 
   // you can add buffer time too here to ignore some small differences in milliseconds
   // set from today
   alarmManager.setRepeating(AlarmManager.RTC, intendedTime, AlarmManager.INTERVAL_DAY, pendingIntent);
} else{
   // set from next day
   // you might consider using calendar.add() for adding one day to the current day
   firingCal.add(Calendar.DAY_OF_MONTH, 1);
   intendedTime = firingCal.getTimeInMillis();

   alarmManager.setRepeating(AlarmManager.RTC, intendedTime, AlarmManager.INTERVAL_DAY, pendingIntent);
}