Alarms based on the AlarmManager class give you a way to perform time-based operations outside the lifetime of your application. For example, you could use an alarm to initiate a long-running operation, such as starting a service once a day to download a weather forecast.
Note: For timing operations that are guaranteed to occur during the lifetime of your application, instead consider using the Handler class in conjunction with Timer and Thread. This approach gives Android better control over system resources. A repeating alarm is a relatively simple mechanism with limited flexibility. It may not be the best choice for your app, particularly if you need to trigger network operations. A poorly designed alarm can cause battery drain and put a significant load on servers.
A common scenario for triggering an operation outside the lifetime of your app is syncing data with a server. This is a case where you might be tempted to use a repeating alarm. But if you own the server that is hosting your app's data, using Google Cloud Messaging GCM in conjunction with sync adapter is a better solution than AlarmManager.
A sync adapter gives you all the same scheduling options as AlarmManagerbut it offers you significantly more flexibility. See the linked videos at the top of this page for a detailed discussion of when and how to use GCM and sync adapter. Alarms do not fire when the device is idle in Doze mode.
Any scheduled alarms will be deferred until the device exits Doze. If you need to ensure that your work completes even when the device is idle there are several options available. Another option is to use the new WorkManager API, which is built to perform background work either once or periodically.
For more information, see Schedule tasks with WorkManager. Every choice you make in designing your repeating alarm can have consequences in how your app uses or abuses system resources. For example, imagine a popular app that syncs with a server.
How to set Alarm in Android programmatically ?
If the sync operation is based on clock time and every instance of the app syncs at p. Use setInexactRepeating instead of setRepeating. When you use setInexactRepeatingAndroid synchronizes repeating alarms from multiple apps and fires them at the same time. This reduces the total number of times the system must wake the device, thus reducing drain on the battery.
As of Android 4. Note that while setInexactRepeating is an improvement over setRepeatingit can still overwhelm a server if every instance of an app hits the server around the same time.
Therefore, for network requests, add some randomness to your alarms, as discussed above. Repeating alarms that are based on a precise trigger time don't scale well. The different alarm types are described in more detail in the following section. As described above, repeating alarms are a good choice for scheduling regular events or data lookups. A repeating alarm has the following characteristics:. There are two general clock types for alarms: "elapsed real time" and "real time clock" RTC.
Elapsed real time uses the "time since system boot" as a reference, and real time clock uses UTC wall clock time.Hi, I want just to set the alarm and do nothing like you invoke onReceive when the alarm goes off. What should be the pending Intent parameter in the set method then.
I set it to null but the alarm is not being set. Is the pending intent necessary for setting alarm. Hi pending intent is important to receive the intent in BroadcastReceiver whenever the alarm goes off Thanks.
Hi prince Mote. You can pass parameter while setting the alarm like intent. Hope it help you.
HelloExcuse me, in my app i have seekbar and some codes to change the brightness I wish to change it with the alarm When the alarm firedthe brightness changes. Hello This is not relevant question to the tutorial. You can put this question on forums. You can use LocalBroadCastManager for this purpose. Wednesday, 20 January How to set Alarm in Android programmatically?
Following is the code to set alarm. MONTH,5 ; cal. YEAR, ; cal. Calendar; import android. Activity; import android. AlarmManager; import android.
ListActivity; import android. Notification; import android. NotificationManager; import android. PendingIntent; import android. Context; import android. Intent; import android. Bundle; import android. ArrayAdapter; import android.During these challenging times, we guarantee we will work tirelessly to support you. We will continue to give you accurate and timely information throughout the crisis, and we will deliver on our mission — to help everyone in the world learn how to do anything — no matter what.
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The wikiHow Tech Team also followed the article's instructions and validated that they work. Samsung Galaxy Phones.
Tips and Warnings. Related Articles. Article Summary. This wikiHow teaches you how to set an alarm using your Android's Clock app. Method 1 of Open the Clock app. Tap the clock-shaped app in your Android's list of apps.
You may have to open the list of apps by either tapping the Apps icon or by swiping up from the bottom of the page.I wanna ask to you. Is this just for one day, or repeatly everyday and everyweek? If just one day, can you share how to set the alarm repeatly everyday and everyweek?
How to do it? To stop a alarm, please read Cancel alarm with a matching PendingIntent. Many thanks for sharing Hi, I wanna ask to you,how can I use notification in this project instead of Toast?
Thank you. Example 5 alarms with different names??? I going to build a app in which two button one for starting time and end time, if the user select the time for silent the mobile acorcoding to start time and unsilent mobile when the end time matched, how to do in android plz help I am a new.
After reminder rings i have updated time in Broadcast receiver class so now the time is update but my reminder doesnt ring for this new time.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have this piece of code that fire the alarm once by setting a time and date using the TimePicker and the DatePicker in another activity. I want to modify it in a way that whenever I set a time and a date it will fire the alarm everyday at the same time. In other words I want the alarm to be fired daily. I have tried using setRepeating function but I don't know how exactly I should set the attributes I used this line instead of the set function on the code but it didn't work:.
You can see this link: How to run a service every day at noon, and on every boot You should remember to reset schedule on phone restart, link includes code for that aswell.Simple Alarm Application in Android Studio 3.3.0 -Source Code Available-Android Development Tutorial
Learn more. Asked 8 years, 4 months ago. Active 6 years, 4 months ago. Viewed 6k times. Benjamin Active Oldest Votes. Just modify the code alarmManager. Bobrovsky Tofeeq Ahmad Tofeeq Ahmad Warpzit Warpzit Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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Schedule repeating alarms
Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Dark Mode Beta - help us root out low-contrast and un-converted bits. Technical site integration observational experiment live on Stack Overflow. Triage needs to be fixed urgently, and users need to be notified upon…. Linked Hi kamlesh. Hi Rekha With following code you will get the current time in Milseconds.
YEAR, ; and so on Let me know any more concern. So if i do change the above mentioned thing, then gc cannot be Long. I cant even try casting here So pls give a solution Thanks in Advance.
Bt the code is still not getting invoked Or atleast tell where can i paste my code, such that u can give a chk. Now the 1st prob is m not getting how to send value to broadcastReceiver and second is int value changes on "if " condition, now how can i send the value that is stored according to the condition.
Hi Admin Nice Tutorial. But i have a doubt. Your code work awesome once. I mean u did it for 1 day. What if i want to do it EveryDay that too Dynamically Please Reply Dear Admin, Nice Tutorial. But could u pls guide me that how to execute this code everyDay I need this code. Thanks in advance. Oh man been looking around for an example on how to trigger an event in future and all examples I came across are so unnecessarily complicated and convoluted!This article explains how to create and schedule the alarms using AlarmManager and notify user via BroadcastReceiver.
An example can be thought of as downloading the weather report once in a day or twice in a day and notifying the user. Characteristics of Alarms Alarms can let one fire Intents at set times or in certain time intervals. Alarms can be used together with the broadcast receiver to notifies the user. Alarms can triggers even if the device falls asleep because they run outside the application.
Alarms can be scheduled to a specific sharp time thus reducing system resources by not relying on background services. It doesn't wake up the device. So let's have a look to this specific code given below. This piece of code runs as it notifies vibrate in our case user at the time mentioned like 14 hrs and at 40 min but it is up to you which time you would prefer. You might set the time at 15 hrs or at any time.
We are using the AlarmManager. Now After Registering a BroadcastReciever that notifies the user whether it means vibrate or executing the alarm as shown in the code below. Selecting first the Alarm type and appropriate methods to start Alarm using AlarmManager class.
View All. Gaurav Kumar Updated date, Mar 16 The above part of code is just to show how to fire the intent at a particular time now we will see the entire code of MainActivity. In this article, we have learned how to create and schedule the alarms and notify user via BroadcastReceiver. Next Recommended Article. Getting Started With. NET 5. Getting Started with ML. NET Core.