I am using this code to create an Alarm in a activity that can be launched by the user.
The Alarm sends an intent that launches a broadcast reciever and then a service.
private void setGameAlerts(){
//Setting alarm to fire off NEW_GAME intent every 24 hours.
String alarm = Context.ALARM_SERVICE;
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 8);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND, 0);
AlarmManager am = (AlarmManager)getActivity().getSystemService(alarm);
Intent intent = new Intent("NEW_ITEM");
PendingIntent sender = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
am.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis() , AlarmManager.INTERVAL_DAY, sender);
Log.e("RELEASE LIST", "ALARM Set For 1 day from " + calendar.getTimeInMillis());
For some reason EVERYTIME the activity is launched it Automatically sends this intent and the service is launched. is there something wrong with my code that is causing this to happen other than the alarm going off everyday at 8 oclock?
It looks to me like you're setting it for 8am TODAY, not 8am tomorrow. For example, if I run this code:
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 8);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND, 0);
Log.i("Test", "Current time: " + System.currentTimeMillis() );
Log.i("Test", "Calendar time: " + calendar.getTimeInMillis() );
calendar.add(Calendar.DATE, 1);
Log.i("Test", "Calendar time with a day added: " + calendar.getTimeInMillis() );
I get the result:
10-06 23:26:50.050: INFO/Test(8890): Current time: 1317968810056
10-06 23:26:50.050: INFO/Test(8890): Calendar time: 1317913200000
10-06 23:26:50.050: INFO/Test(8890): Calendar time with a day added: 1317999600000
The calendar time is a number less than the current time, so therefore that calendar entry is in the past. It might make some sense that Android would immediately send the intent for an event that has past. If you add a day to it, or specify a date in your Calendar object, it should work.
Note that this numerical dates are simply the standard Unix time with milliseconds added on. If you drop the last three digits and put the number into a Unix time converter, you'll be able to check that the numbers you're working with make sense. Eg: use 1317999600 with the Unix time converter and you'll get 10am EST, which is 8am PST (my time zone).
I hope that helps!
Related
Can you plese help me understand why my alarm won't fire :
I am trying to register a pending intent in oder to fire the alarm at 12:22 (current hour now) but the problem is that the alarm won't fire . I tried substituting the miliseconds from calendar.getTimeInMilies() with a hard-encoded time : 10 000 milies (10 seconds);
Not even that it had worked .
AlarmManager alarm_manager =(AlarmManager)this.getSystemService(Context.ALARM_SERVICE);
calendar = Calendar.getInstance();
Intent intent = new Intent(MainActivity.this , AlarmManagerHelper.class);
PendingIntent register =PendingIntent.getActivity(getBaseContext(), 0, intent,0);
calendar.set(Calendar.YEAR,2014);
calendar.set(Calendar.MONTH, 10);
calendar.set(Calendar.DAY_OF_MONTH, 2);
calendar.set(Calendar.HOUR_OF_DAY,12);
calendar.set(Calendar.MINUTE,22);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.AM_PM, Calendar.AM);
alarm_manager.set(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(), register);
SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss");
Log.d(TAG ,"Time format is :" +formatter.format(calendar.getTime()));
I also have the following permission set in the Manifest
android:name="android.permission.WAKE_LOCK"
And the output :
Time format is :02/11/2014 12:22:00
Try to use getBroadcast method instead of getActivity:
PendingIntent register =PendingIntent.getBroadcast(MainActivity.this, 0, intent,0);
Hope this helps.
Hi guys this is what i have so far:
PendingIntent sender = PendingIntent.getBroadcast(mainactivity, 0, intent, 0);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 10);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
showmsg();
the alarm comes after 10 seconds How can I make it in desire time i want, I have set a timepicker so how can i do it depending on the timepickers time to ring the alarm?
Thanx.
With your TimePicker, call picker.getCurrentHour() and picker.getCurrentMinute(). Use these values to calculate the total milliseconds of the given time of day (12:00 pm would equal 43200000 ms, for example) by multiplying by the milliseconds in an hour (3600000) or minute (60000). Then get the milliseconds of today's date when it started at 0:00. That would all look like this:
//time of day in ms
long totalTimePickerMs = (picker.getCurrentHour() * 3600000) + (picker.getCurrentMinute() * 60000);
//today's date in ms
Calendar c = Calendar.getInstance();
Date d = c.getTime();
long today = d.getDay() + d.getMonth() + d.getYear();
long total = today + totalTimePickerMs;
Essentially you are getting today at midnight (0:00) in milliseconds and adding to it the milliseconds of the specific time of day.
Then like you did before, except set the alarm with total as the second parameter.
I am using this code to launch an Alarm.
The alarm is set in an Activity that the user can launch.
//Setting alarm to fire off NEW_GAME intent every 24 hours.
String alarm = Context.ALARM_SERVICE;
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 8);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND, 0);
Log.i("Test", "Current time: " + System.currentTimeMillis() );
Log.i("Test", "Calendar time: " + calendar.getTimeInMillis() );
int currentDate = calendar.get(Calendar.DATE);
calendar.set(Calendar.DATE, currentDate+1);
Log.i("Test", "Calendar time with a day added: " + calendar.getTimeInMillis() );
AlarmManager am = (AlarmManager)getActivity().getSystemService(alarm);
Intent intent = new Intent("NEW_ITEM");
PendingIntent sender = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
am.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis() , AlarmManager.INTERVAL_DAY, sender);
I was told i need to supply a uniqu id so that the alarm doesnt over writte each other where getBroadcast() is.
The problem is how do I do this when the user can open the Activity as many times as they want?
Also if I supply a unique ID each time this means it could possibly set 5 of the same ALARMS because of the unique id's.
How or what is the best way to get around this?
you could always just use the unix timestamp of your target time as the unique id. that way, alarms for the exact time WILL override each other, while all other alarms will stay seperate
[EDIT:] Here is some example code:
AlarmManager am = (AlarmManager)getActivity().getSystemService(alarm);
Intent intent = new Intent(String.valueOf(calendar.getTimeInMillis()));
PendingIntent sender = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
am.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis() , AlarmManager.INTERVAL_DAY, sender);
I am using this code to set a Alarm everyday for 8 oclock the next day.
I am setting this alarm in an activity that can be opened based upon the user.
//Setting alarm to fire off NEW_GAME intent every 24 hours.
String alarm = Context.ALARM_SERVICE;
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 8);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND, 0);
Log.i("Test", "Current time: " + System.currentTimeMillis() );
Log.i("Test", "Calendar time: " + calendar.getTimeInMillis() );
int currentDate = calendar.get(Calendar.DATE);
calendar.set(Calendar.DATE, currentDate+1);
Log.i("Test", "Calendar time with a day added: " + calendar.getTimeInMillis() );
AlarmManager am = (AlarmManager)getActivity().getSystemService(alarm);
Intent intent = new Intent("NEW_ITEM");
PendingIntent sender = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
am.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis() , AlarmManager.INTERVAL_DAY, sender);
My only question is..Lets say at 10:00 o clock today am. i open the activity that alarm is set for tomorrow..Lets say i open the activity again at 12:00 am mid-night, will the alarm set earlier that day be overr written by the current alarm being set?
If you use the same request number (second parameter) while creating the PendingIntent object
PendingIntent sender = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
then it will overwrite the current PendingIntent and hence will replace the current Alarm.
It will also depend on what you pass as the last parameter to it. Possible values given in the constants section here.
In Android we set an alarm by setting the time until it goes off in milliseconds. Is there an easy way to find how many milliseconds there are until a certain time (hh:mm) or do I just have to calculate it mathematically?
Thanks!
Save your current time in milliseconds as
Calandar calendar = Calendar.getInstance();
Long currenttime = calendar.getTimeInMillis();
Long settime= <your set time in milliseconds>;
Here you can calculate the difference as follows:
Long differencetime = settime - currenttime;
int dif=(int)differencetime/1000;
Here you can set the time in calendar:
calendar.set(Calendar.SECOND, calendar.get(Calendar.SECOND) + dif);
Here you can set the alarm for the settime.
AlarmManager alarmManager1 = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager1.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pi1);
Check out the first argument for AlarmManager.set(): With RTC/RTC_WAKEUP, you can specify a fixed time rather than an elapsed time.
That said, if you need to use the elapsed time, it's pretty trivial to calculate the number of milliseconds that need to elapse. Worst case, you could use the Calendar and/or Date classes.
Date now = new Date(), b = new Date(year, month, day, hour, min);
b.getTime() - a.getTime();
And here's another way to get the time in milliseconds to a certain time:
Calendar c = Calendar.getInstance();
c.set(c.YEAR, c.MONTH, c.DAY_OF_MONTH, 17, 1, 0); // 5:01 pm
long alarmTime = c.getTimeInMillis();
AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, AlarmNotification.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
am.setRepeating(AlarmManager.RTC_WAKEUP, alarmTime, 1000 * 60 * 60 * 24, pendingIntent); // Millisec * Second * Minute * Hour // Same time every day
RTC_WAKEUP allows the alarm to still activate when the phone is asleep. Use RTC if you want to wait until the user wakes up the phone themself.
Use am.set() if you don't want the alarm to repeat
Let me know if this helps.