Intent toastIntent= new Intent(getApplicationContext(),ToastBroadcastReceiver.class);
        PendingIntent toastAlarmIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, toastIntent,PendingIntent.FLAG_UPDATE_CURRENT);
        long startTime=System.currentTimeMillis(); //alarm starts immediately
        AlarmManager backupAlarmMgr=(AlarmManager)this.getSystemService(Context.ALARM_SERVICE);
        backupAlarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,startTime,AlarmManager.INTERVAL_FIFTEEN_MINUTES,toastAlarmIntent); // alarm will repeat after every 15 minutes