Скачать или смотреть How to Make AlarmManager Work After App Closes in Android

Learn how to ensure your `AlarmManager` triggers even when your Android application is closed. This guide provides a clear step-by-step guide to set up a `BroadcastReceiver` properly.
---
This video is based on the question https://stackoverflow.com/q/64419915/ asked by the user 'Dayo' ( https://stackoverflow.com/u/14124510/ ) and on the answer https://stackoverflow.com/a/64444893/ provided by the user 'David Wasser' ( https://stackoverflow.com/u/769265/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How do I make alarmmanager execute after my application has been closed?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Make AlarmManager Work After App Closes in Android

If you're developing an Android application and need a way to trigger specific actions even when the application is not running, the AlarmManager is a powerful tool at your disposal. However, many developers encounter issues with their alarms not functioning properly after the application has been closed. In this guide, we will discuss how to set up your AlarmManager to execute a BroadcastReceiver even when your application is not active.

Understanding the Problem

You want your AlarmManager to ring or trigger an action even after your application has been closed. The most common problem encountered is that the BroadcastReceiver does not get called once the application has been terminated. This can be due to incorrect settings in your manifest file or issues with how the AlarmManager is configured.

Solution Breakdown

To resolve this issue, you'll need to make a few tweaks to your code. Let's break down the essential steps you should follow:

1. Update Your <receiver> Declaration in the Manifest

The first thing you need to do is update your BroadcastReceiver declaration in your AndroidManifest.xml. You must specify that your receiver is exported, which allows the AlarmManager to properly trigger the BroadcastReceiver. This can be achieved by setting android:exported="true" in the <receiver> tag.

[[See Video to Reveal this Text or Code Snippet]]

2. Remove Unnecessary Cancel Calls

In your code, you have a line that cancels the PendingIntent before re-scheduling it. This step is not necessary when using AlarmManager. The AlarmManager automatically takes care of this when you set a new alarm. Therefore, you can remove the alarmManager.cancel(pendingIntent); line.

3. Simplifying the Intent Configuration

When creating the Intent for the BroadcastReceiver, you are using an explicit intent by specifying the exact class. This means you do not need to set an action in the intent or include an intent filter in the receiver's manifest declaration.

Here is your corrected Intent setup:

[[See Video to Reveal this Text or Code Snippet]]

4. Code Recap for Clarity

Here’s the complete corrected code snippet for setting the AlarmManager:

[[See Video to Reveal this Text or Code Snippet]]

5. Verify Your BroadcastReceiver

Ensure that your autoCheckReceiver is implemented correctly. The onReceive method should have the logic you require when the alarm triggers. As shown initially, it starts a specific Activity, providing feedback in the logs:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these outlined steps and adjustments, you will be able to successfully configure your AlarmManager to execute your BroadcastReceiver even when your application is closed. This functionality is crucial for applications that need to perform background tasks or reminders without requiring the app to be running at all times.

Now you are set to enjoy your properly functioning alarm system in your Android app, ensuring that it works seamlessly for users at any time. Happy coding!