Develop Reference

Why my Alarm is fired earlier than my set time?

I'm currently trying to make an alarm app that will mute all audio volume at the user-defined day and time. However, the alarm seems not fired at the correct time. I found that the alarm is always fired earlier.
This is my set alarm code:
public static void setAlarm(Context context, String time, int day, int reqCode) {
String[] timeSplit = time.split(":");
Calendar calendar = Calendar.getInstance();
int hour = Integer.parseInt(timeSplit[0]);
int minute = Integer.parseInt(timeSplit[1]);
int days = (day-calendar.get(Calendar.DAY_OF_WEEK) + calendar.get(Calendar.DAY_OF_MONTH));
calendar.set(
calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH),
days,
hour,
minute,
0
);
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, RuleAlarm.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, reqCode, intent, 0);
// Set the alarm to be fired every week on the selected day
alarmManager.setRepeating(AlarmManager.RTC, calendar.getTimeInMillis(), 7 * 24 * 60 * 60 * 1000, pendingIntent);
Toast.makeText(context, "Alarm is set", Toast.LENGTH_SHORT).show();
}
I have tried to change setRepeating() to setInexactRepeating() but nothing changed.

AlarmManger is inexact to save battery by combining wakeup calls.
https://developer.android.com/reference/android/app/AlarmManager.html

Try this
alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 7 * 24 * 60 * 60 * 1000, pendingIntent);
The problem is that if you are creating PendingIntent for an alarm for past time it will be fired immediately.If you would like to prevent that happening, then simply do not set alarms with a past trigger time . Use BroadcastReceiver for receiving alarm.
Update :
Check we aren't setting it in the past which would trigger it to fire instantly
if(calendar.getTimeInMillis() < System.currentTimeMillis()) {
calendar.add(Calendar.DAY_OF_YEAR, 7);
}

I finally find out the problem. It lies on the day params. What I pass to day params is my Spinner selected position which starts from zero while the Calendar days starts from one (SUNDAY = 1, MONDAY = 2, so on). So, the alarm will always be set in the past days. I plus one to the day params and it's worked.
This is my piece of code where the startAlarm() function got called.
String ruleStartTime = rule_startTime.getText().toString();
// Spinner index starts from zero,
// to match with the Calendar day indexing, we need to plus it one
int dayIdx = day.getSelectedItemPosition()+1;
Alarm.setAlarm(getApplicationContext(), ruleStartTime,
dayIdx, 0);

Multiple alarms are getting fired after reboot in android through broadcast receiver

I am making a notification application and for that i am using scheduled alarms for running the notifications using Broadcast receiver class and i am prompting user to select from daily or hourly notifications and i am defining both alarms in the same receiver under the same function and it is working fine but the problems comes when i restart my device,when i restart it both the alarms (daily and hourly) are getting triggered when i am only setting one for example if i set an alarm for 11:20 A.M and restart my device the hourly one and this 11:20 one both are getting triggered,i want that when i restart my device only the alarm which was selected before the device boot only gets triggered.
My receiver class:-
public class alarmreceiver extends BroadcastReceiver {
int id=0;
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "Alarm running", Toast.LENGTH_SHORT).show();
start(context,id);
}
static void start(Context context,int id) {
Intent intent = new Intent(context, notification_receiver.class);
PendingIntent pendingintent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
if (id==1) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR, 11);
calendar.set(Calendar.MINUTE, 9);
calendar.set(Calendar.AM_PM, Calendar.AM);
alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingintent);
}
else
if (id==2) {
alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime(), 60 * 1000
, pendingintent);
}
}
I am calling this function under button click listener like this:-
For daily notifications:-
alarmreceiver.start(getApplicationContext(),1);
For hourly notifications:-
alarmreceiver.start(getApplicationContext(),2);

This code:
alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime(), 60 * 1000, pendingintent);
sets a repeating alarm that goes off every minute, not every hour!
Also, this code sets an alarm that goes off right now and again every minute. The second argument to setRepeating() is the time of first alarm. You've passed SystemClock.elapsedRealtime() which basically means "now".

Android AlarmManager triggered immediately even with correct parameters?

I am setting an AlamManager from the onCreate of my main Activity.
Here is the method
public void scheduleAdsUpdateAlarm() {
long THEE_HOURS = 3 * 60 * 60 * 1000;
long THREE_MINUTES= 3*60*1000;
long UNTIL_FIRST_TRIGGER = THREE_MINUTES;
// Construct an intent that will execute the AlarmReceiver
Intent intent = new Intent(getApplicationContext(), AdsUpdateAlarmReceiver.class);
// Create a PendingIntent to be triggered when the alarm goes off
final PendingIntent pIntent = PendingIntent.getBroadcast(this, AdsUpdateAlarmReceiver.REQUEST_CODE,
intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarm = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
if(alarm != null){
alarm.cancel(pIntent);
alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, UNTIL_FIRST_TRIGGER,
THREE_MINUTES, pIntent);
}
}
As you can see the alarm is set to run every three hours with the initial start after three minutes.
Problem is that the alarm goes off immediately when the onCreate and the following alarm setup is called. I don't understand what I am doing wrong?

alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, UNTIL_FIRST_TRIGGER,
THREE_MINUTES, pIntent);
should be changed to:
alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + UNTIL_FIRST_TRIGGER, THREE_MINUTES, pIntent);
since the second parameter in alarm.setInexactRepeating isn't a milliseconds from now value but an actual time value.

Alarmmanager fires first time but doesn't repeat

I want an Alarmmanager to fire first time after 2 Seconds and then every 10 Sec.
It doesn't fire the first time exactly 2 seconds later. Something between 5 and 10 sec later. And it doesn't repeat at all.
Here is my Code:
Alarmmanager:
Intent intent = new Intent(this, BackgroundService.class);
final PendingIntent pendingintent = PendingIntent.getBroadcast(getApplicationContext(), 0, intent, 0);
final AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC, System.currentTimeMillis() + 2 * 1000, 10 * 1000, pendingintent);
Manifest:
<receiver android:process=":remote" android:name=".BackgroundService"/>
BackgroundService.java:
public class BackgroundService extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Log.d("BackgroundService", "BackgroundService onReceive");
}
}

Got it:
The IDE says: The 3rd value will be forced up to 60000 (1 Min) to save battery. But I never waited so long, so it looked like it doesn't even repeates.
Snap is here

am.setRepeating(AlarmManager.RTC_WAKEUP, **cal_alarm.getTimeInMillis()**, 1000*60*5 , pendingIntent);
I think you are using System.currentTimeMillis() because of which you are having that issue. Try to get the time from you code for which you have set the Alarm. The third parameter in the above code is the repeating time. You can set it to 10 sec.

this heslp me
if (android.os.Build.VERSION.SDK_INT >= 19) {
alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
} else {
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
}

Alarm Manager doesn't work on time

I have this method which should schedule alarms but when the time arrives it doesn't start the pendingintent ??
public void setAlarm(String name, long time) {
AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent dialog = new Intent(this, SubActivity.class);
dialog.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pi = PendingIntent.getActivity(this, 0, dialog, 0);
if (Build.VERSION.SDK_INT >= 19) {
if (System.currentTimeMillis() < time) {
am.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP, time, pi);
}else{
time+=(AlarmManager.INTERVAL_DAY*7);
am.setExact(AlarmManager.RTC_WAKEUP, time, pi);
}
} else {
am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, time, AlarmManager.INTERVAL_DAY * 7, pi);
}
}

The problem is you are using a PendingIntent for an Activity, which will not necessarily keep the device awake long enough for the Activity to get started. You'll have to use a PendingIntent for a BroadcastReceiver which leverages a wake lock to keep the device awake until your app code can run. WakefulBrodcastReceiver is a good choice, or you can roll your own as needed. See this article for an explanation and sample of how to use alarms to wake the device: http://po.st/7UpipA