android – Fire notification at every 24 hours and at exact time of 8 AM-ThrowExceptions

Exception or error:

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

My code is on onCreate() in Splash Activity which fires first when anyone opens App. User can install App at anytime. So I want that when User installs App, It checks for the timing and then fires Notification at 8 AM and repeat it daily. I don’t want notification when anyone opens App.

My code is as below :

public class Splash extends Activity {

final String WebsiteURL = "http://www.mytestbuddy.com";

String cookie;

@SuppressLint("SimpleDateFormat")
@Override
protected void onCreate(Bundle showSplash) {
    // TODO Auto-generated method stub
    super.onCreate(showSplash);
    setContentView(R.layout.splash);

    getWindow().getDecorView().setBackgroundColor(Color.WHITE);

    Intent myIntent = new Intent(Splash.this, AlarmReceiver.class);

    final PendingIntent pendingIntent = PendingIntent.getBroadcast(
            Splash.this, 0, myIntent, 0);

    final AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

    CookieSyncManager.createInstance(this);
    CookieManager cm = CookieManager.getInstance();
    cm.setAcceptCookie(true);
    CookieSyncManager.getInstance().sync();
    if (cm.getCookie("" + WebsiteURL + "") != null) {
        cookie = cm.getCookie("" + WebsiteURL + "").toString();
    } else {
        cookie = null;
    }

    Thread timer = new Thread() {
        public void run() {
            try {
                sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                if (cookie == null) {
                    Intent openStartingPoint = new Intent(
                            "com.MobileWeb.mytestbuddy.Login");
                    startActivity(openStartingPoint);
                } else if (cookie.contains("Premium")) {

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

                    firingCal.set(Calendar.HOUR, 10);
                    firingCal.set(Calendar.MINUTE, 30);
                    firingCal.set(Calendar.SECOND, 0);

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

                    if (intendedTime >= currentTime) {
                        alarmManager.setRepeating(AlarmManager.RTC,
                                intendedTime, AlarmManager.INTERVAL_DAY,
                                pendingIntent);

                    } else {
                        firingCal.add(Calendar.DAY_OF_MONTH, 1);
                        intendedTime = firingCal.getTimeInMillis();

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

                    Intent openStartingPoint = new Intent(
                            "com.MobileWeb.mytestbuddy.PremiumMain");
                    startActivity(openStartingPoint);
                } else {

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

                    firingCal.set(Calendar.HOUR, 10);
                    firingCal.set(Calendar.MINUTE, 30);
                    firingCal.set(Calendar.SECOND, 0);

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

                    if (intendedTime >= currentTime) {
                        alarmManager.setRepeating(AlarmManager.RTC,
                                intendedTime, AlarmManager.INTERVAL_DAY,
                                pendingIntent);

                    } else {
                        firingCal.add(Calendar.DAY_OF_MONTH, 1);
                        intendedTime = firingCal.getTimeInMillis();

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

                    Intent openStartingPoint = new Intent(
                            "com.MobileWeb.mytestbuddy.Main");
                    startActivity(openStartingPoint);
                }
            }
        }
    };

    timer.start();
}

}

How to solve:

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);
}

###

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.

###

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);

###

// 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);

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