in my task application, i want to create alarm service for multiple items. Here is the code i followed to create service. Lets assume, if there are more than 5 items present in list. then we will sent alarm service for 5 different times.
What if the user comes and edits the time?, how to update the system and make sure it triggers at new instance?. What if the user delete the task, how to quickly removes the registered alram for the deleted task?
What about uninstalling the app?, how to clear all the entries?, what if the system re-boots?
This is the code i'm following to register the task in alram services
Calendar Calendar_Object = Calendar.getInstance();
Calendar_Object.set(Calendar.MONTH, 8);
Calendar_Object.set(Calendar.YEAR, 2012);
Calendar_Object.set(Calendar.DAY_OF_MONTH, 6);
Calendar_Object.set(Calendar.HOUR_OF_DAY, 14);
Calendar_Object.set(Calendar.MINUTE, 25);
Calendar_Object.set(Calendar.SECOND, 0);
Step 2:
We need to create an alarm which help us to invoke the BroadCastReceiver on our specified time.
// MyView is my current Activity, and AlarmReceiver is the BoradCastReceiver
Intent myIntent = new Intent(MyView.this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
MyView.this, 0, myIntent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
/*
The following sets the Alarm in the specific time by getting the long value of the alarm date time which is in calendar object by calling the getTimeInMillis(). Since Alarm supports only long value , we're using this method.
*/
alarmManager.set(AlarmManager.RTC, Calendar_Object.getTimeInMillis(),
pendingIntent);
Use this method to set Alarm :
public static void startAlarm(Context context, int alarm_code, String time) {
String[] arrTime = time.split(":");
intent = new Intent(context, AlarmReceiver.class);
intent.putExtra("CODE", alarm_code);
PendingIntent mAlarmSender = PendingIntent.getBroadcast(context,
alarm_code, intent, 0);
Calendar cal_alarm = Calendar.getInstance();
cal_alarm.setTimeZone(TimeZone.getDefault());
cal_alarm.set(Calendar.HOUR_OF_DAY, Integer.parseInt(arrTime[0]));
cal_alarm.set(Calendar.MINUTE, Integer.parseInt(arrTime[1]));
AlarmManager am = (AlarmManager) context
.getSystemService(Context.ALARM_SERVICE);
am.setRepeating(AlarmManager.RTC_WAKEUP, cal_alarm.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, mAlarmSender);
}
Here,"int alarm_code" is your unique code for particular item.
And for update alarm first cancel the existing alarm and set new alarm for new time.For that use this method :
public static void cancelAlarm(Context context, int alarm_code) {
AlarmManager am = (AlarmManager) context
.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, AlarmReceiver.class);
intent.putExtra("CODE", alarm_code);
am.cancel(PendingIntent.getBroadcast(context, alarm_code, intent, 0));
}
Here,"int alarm_code" will be your unique code which you have used to set alarm.So that alarm with particular alarm_id will be cancel.You can also delete alarm with this method.
Same way you can clear all the alarms passing alarm_code to the given function.
You have to register receiver for system reboot and in onReceive of register you have to set all alarms again.
Hope this will help you.
Related
I use AlarmManager to set two action on time,
First action set on 10:00:00, and second action set on 10:15:00.
I can get two action broadcast,
and get first action broadcast on 10:00:03 (is OK),
but get second action broadcast on 10:29:15,14 minutes late!
How let AlarmManager can send broadcast on time ??
Set AlarmManager code:
#Override
public void onCreate() {
setSchedule();
}
private void setSchedule(){
AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Calendar offCal = Calendar.getInstance();
offCal.set(Calendar.HOUR_OF_DAY, 10);
offCal.set(Calendar.MINUTE, 15);
offCal.set(Calendar.SECOND, 00);
Intent offIntent = new Intent(this, AlarmReceiver.class);
offIntent.setAction(AlarmReceiver.ALUM_SCREEN_OFF);
PendingIntent offPending = PendingIntent.getBroadcast(this, 1,
offIntent, PendingIntent.FLAG_UPDATE_CURRENT);
am.setRepeating(AlarmManager.RTC, offCal.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, offPending);
Intent onIntent = new Intent(this, AlarmReceiver.class);
onIntent.setAction(AlarmReceiver.ALUM_SCREEN_ON);
Calendar onCal = Calendar.getInstance();
onCal.set(Calendar.HOUR_OF_DAY, 10);
onCal.set(Calendar.MINUTE, 00);
onCal.set(Calendar.SECOND, 00);
PendingIntent onPending = PendingIntent.getBroadcast(this, 2,
onIntent, PendingIntent.FLAG_UPDATE_CURRENT);
am.setRepeating(AlarmManager.RTC_WAKEUP, onCal.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, onPending);
}
Receiver code:
public class AlarmReceiver extends BroadcastReceiver {
public static final String ALUM_SCREEN_ON = "screenOn";
public static final String ALUM_SCREEN_OFF = "screenOff";
private static final String TAG = "AlarmReceiver";
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Log.d(TAG, "get braodcast action:"+intent.getAction());
}
Hi you are using setRepeating method which wont give alarm at exact time.Alarm manager will strongly discourage other apps apart from system apps to trigger alarm accurately for the better battery optimization.so if u want to trigger alarm at a particular time means you can use setExact() method This also wont give you complete gaurantee but it will give you the most accuracy one .While setting multiple alarms at a single time make sure you are giving different ids in `
PendingIntent onPending = PendingIntent.getBroadcast(this, 2,
onIntent, PendingIntent.FLAG_UPDATE_CURRENT);
here you gave 2 as id and it should be different for different alarms.
Since KitKat the set and setRepeating APIs are not exact. If you absolutely need the alarm to run at a specific time, use setExact. Consider using setWindow instead if the alarm time is not critical.
There is no setExactRepeating, so if you need that, you need to use setExact and them re-arm your alarm. But unless your are doing time critical stuff, that's not recommended.
I am trying to set repeating alarms in an exact fashion by manually setting an alarm to the next day the moment I receive it in a broadcast. However, I might be missing something and somehow its not working.
The Logic:
When I select the time from a time chooser, I set an exact alarm to the time given and start a pending intent which calls MyBroadCastReceiver.java (extends BroadcastReceiver) when its time. I then forward the intent with another pending intent to AlarmFireActivity. (AlarmFireActivity also has snooze which simply sets a pendingIntent to itself to fire after 5 mins.)
The MyBroadCastReceiver component hence only receives the actual alarms (not snoozes). And its functions are :
a) Get the non-repeating pending intent cancel it, then create another pending intent from the intent and then set it with the milliseconds set to the next day at the same time.
b) Start the AlarmFireActivity and show the alarm.
In AddAlarmActivity
Intent intent = new Intent(context, MyBroadcastReceiver.class);
intent.putExtra(DBHelper.COLUMN_ID,alarm.getId());
AlarmManager alarmManager = (AlarmManager) context.getApplicationContext().getSystemService(Context.ALARM_SERVICE);
if (alarmManager != null) {
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, reminder.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, reminder.getHourOfDay());
calendar.set(Calendar.MINUTE, reminder.getMinuteOfHour());
calendar.set(Calendar.SECOND,0);
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
pendingIntent);
BLog("Pending intent added at " + new SimpleDateFormat(utilFunctions.timeFormat).format(calendar.getTime()));
}
Snippet MyBroadCastReceiver.java TaskOne
Logic
Get the intent which MyBroadCastReceiver receives. Reuse the same intent in a new PendingIntent set to the next day at the same time.
Code
AlarmManager alarmManager = (AlarmManager) context.getApplicationContext().getSystemService(Context.ALARM_SERVICE);
if (alarmManager != null) {
PendingIntent p1 = PendingIntent.getBroadcast(context, alarmCurrent.getReminderId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
if(p1!=null){
alarmManager.cancel(p1);
}
PendingIntent pendingIntent1 = PendingIntent.getBroadcast(context, alarmCurrent.getReminderId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
//for test
calendar.add(Calendar.MINUTE,1);
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
pendingIntent1);
}
MyBroadCastReceiver.java TaskTwo
Logic
If the time when the alarm was set was after the time the alarm is due, do not forward the pending intent to the AlarmFireActivity.
Else forward it to the AlarmFireActivity which shows the screen to dismiss/snooze the alarm.
Code
Calendar timeSet = alarmCurrent.getAlarmReminderSetTime();
Calendar alarmTime = Calendar.getInstance();
if(timeSet!=null && alarmTime.getTimeInMillis() > timeSet.getTimeInMillis()){
Intent intent1 = new Intent(context, AlarmFireActivity.class);
intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent1.putExtra(DBHelper.COLUMN_ID,id);
String ext = extras.getString(DBHelper.TASK_TITLE);
if(ext!=null){
intent1.putExtra(DBHelper.TASK_TITLE,ext);
}
context.startActivity(intent1);
}else{
}
The BroadCastReceiver is doing the second task just fine. However, not the task one. Its not repeating/ resetting a new pending intent. I am guessing I must have messed up the intent/pendingIntent somewhere. I dont know which. Please help/
The solution is restart the phone. I have seen somewhere that there is a bug in a one of the os' 4.3 or so. A pending intent with a request id of 0 might fail at times. And once I restarted the phone it worked. However, there is a more standard solution which is :
Replacing
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, reminder.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
with
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, A_NUMBER_GREATER_THAN_ZERO + reminder.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
so that you are avoiding a pending intent with 0 at all times. Thanks all!
I would like to add into my application background service which takes given datetime and ID pointing to the table row with additional informations and in given time displays status Bar notification.
Could somebody give me a simple example how can I do it?
Many Thanks for any advice.
Have you looked at using AlarmManager to schedule whatever process you wanted to do? (https://developer.android.com/training/scheduling/alarms.html)
UPDATE: pass parameter to the intent
For example (copied):
// create Intent
PendingIntent alarmIntent;
Intent intent = new Intent(context, AlarmReceiver.class);
intent.putExtra("ID", "ABX1000"); // your ID
alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
// Set the alarm to start at approximately 2:00 p.m.
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 14);
// With setInexactRepeating(), you have to use one of the AlarmManager interval
// constants--in this case, AlarmManager.INTERVAL_DAY.
alarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, alarmIntent);
And in your receiver, get the intent....
#Override
public void onReceive(Context context, Intent intent) {
// Implement code here to be performed when
// broadcast is detected
String myID= intent.getStringExtra("ID");
}
You can trigger a notification or intent using pending intent.
example is here
I am using AlarmManager for my Timer. I have 2 classes.
In the first class (MainActivity) I am starting my alarm with the next code:
public void startAlarm(long Seconds) {
Intent myIntent = new Intent(MainActivity.this, MyAlarmService.class);
pendingIntent = PendingIntent.getService(MainActivity.this, 13141337,
myIntent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, (int) Seconds);
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
pendingIntent);
}
In another class (AlarmSound), where the alarm goes off and the phone vibrates, I'm calling my cancel Alarm method.
public void stopAlarm(){
Intent intentstop = new Intent(AlarmSound.this, MyAlarmService.class);
PendingIntent senderstop = PendingIntent.getBroadcast(AlarmSound.this,
13141337, intentstop, 0);
AlarmManager myalarm = (AlarmManager) getSystemService(ALARM_SERVICE);
myalarm.cancel(senderstop);
Log.w("Karl","stopAlarm?");
}
Is this the correct way to do this? Because my alarm constantly goes off on android 4.1.
Thanks in advance!
Your Cancel wont work. The pending Intents have to match - since they have a different context (MainActivity and AlarmSound) this cancel wont work. You have to also use getService on both.
You can
a) try to recreate a matching pending Intent
b) get the pendingIntent that started the Service in the Service and use that to cancel
But usually every Alarm just goes off once if you dont use setRepeating().
Are you sure you are terminating your Service correctly with stopself() and are giving it the right flag in the onStartCommand() Method?
This is the code:
public void startAlarm(Context context) {
Intent intent = new Intent(context, SyncService.class);
PendingIntent sender = PendingIntent.getService(context, 0, intent, 0);
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
10 min, 20 min, sender);
}
This is my method where I start my alarm... I use it in my main activity in onCreate method... What if I change something in settings, and I want to change a time of Repeating? How to do that? I should kill that one and start new one?
If you read the docs you will notice the following:
If there is already an alarm scheduled
for the same IntentSender, it will
first be cancelled.