Notifications in specific time every day android

Question

I\'d like to make an app that let the user decide what time everyday wants him to remind something with notification...

I\'d like to know how am i supposed to trigge

Answer 1

I know this is an old question but I had a similar requirement and this is what I did. I found the difference between the current system time and the intended time for sending notification in millis and implemented a runnable inside an android service. The below code will come in the Notifyservice.

private Handler notificationTimer = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        if(msg.what==0) {
                sendNotifications();
        }
        super.handleMessage(msg);
    }
};
private Runnable notificationCaller = new Runnable() {

    @Override
    public void run() {
        Message msg = notificationTimer.obtainMessage();
        msg.what = 0;
        notificationTimer.sendMessage(msg);
    }
};        


    Calendar calendar = Calendar.getInstance();
    Calendar timefornotification = Calendar.getInstance();
    timefornotification.set(Calendar.HOUR_OF_DAY, 12);
    timefornotification.set(Calendar.MINUTE, 30);
    timefornotification.set(Calendar.SECOND, 00);

    Long difference = calendar.getTimeInMillis() - timefornotification.getTimeInMillis();

    if(difference<0){
        notificationTimer.postDelayed(notificationCaller, -(difference));
    }
    else{
        notificationTimer.postDelayed(notificationCaller, difference);
    }

   public void sendNotifications(){
        ------Your code here-------
        notificationTimer.removeCallbacksAndMessages(null);
        notificationTimer.postDelayed(notificationCaller, 86400000);
        ------86400000 is one day. So it will repeat everyday-------
   }

You can then call a service from main class to run this in background.

   Intent service = new Intent(this, NotifyService.class);
    this.startService(service);

Answer 2

Use alarm manager and put your notification in NotifyService class

Intent myIntent = new Intent(Current.this , NotifyService.class);     
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
pendingIntent = PendingIntent.getService(ThisApp.this, 0, myIntent, 0);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 12);
calendar.set(Calendar.MINUTE, 00);
calendar.set(Calendar.SECOND, 00);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY , pendingIntent);  //set repeating every 24 hours