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Xamarin tasky12/28/2023 In Android 12, Google introduced a new permission called “ SCHEDULE_EXACT_ALARM” that apps must hold in order to schedule exact alarms (hence the name). Requiring permission to schedule exact alarms Apps are encouraged to schedule inexact alarms when possible to minimize system resource consumption, but until Android 13, there was nothing really limiting apps from scheduling resource-heavy exact alarms. This is why the AlarmManager API provides for scheduling inexact alarms, which are delivered by the system within a window of the trigger time specified by the app. Doze mode is a low-power idle state that prevents most background activity from happening outside of recurring “maintenance windows.” Thus, if too many apps schedule exact alarms at different times, then the device won’t be idling for very long, reducing the overall battery life.ĭoze mode provides a recurring maintenance window for apps to use the network and handle pending activities. These kinds of alarms - called exact alarms - have the ability to bring the device out of “ Doze mode,” one of Android’s core battery-saving restrictions. Likewise, a calendar app wouldn’t be able to notify the user about a meeting they scheduled for 2:00 PM without the use of AlarmManager. Without this API, an alarm clock app wouldn’t be able to fire off an alarm the user set for 06:00 AM unless the user had the app open at that time or the app had a foreground service running. ![]() Alarm clock and calendar apps depend on the AlarmManager API for their core functionality, for example. When the system invokes the alarm at the set time, apps can basically do whatever work they want. Instead, apps are encouraged to use Android’s AlarmManager API, which lets apps schedule “alarms” that run at set times. Apps can’t tell the system exactly when to execute its work through WorkManager, because it wasn’t designed for that purpose. Sometimes, though, apps can’t rely on WorkManager to perform work, because the work that needs to be done has to be done at a very specific point in time. Knowing how and when to schedule background work is important for app developers to understand because most Android devices run on battery power. Work that’s scheduled this way will execute at some point in the future, the timing of which is determined by the information sent to the JobScheduler service when scheduling the work as well as device signals like the charging or network state. Google recommends using the WorkManager API to do most work in the background, which internally uses the system JobScheduler service to schedule tasks. while the app isn’t visible to the user) have a few options on Android. Esper for Developers Background work and alarmsĪpps that want to perform work in the background (i.e. For example, Android 13 places new restrictions on which apps can schedule exact alarms, a change that is designed to improve battery life but may break functionality in apps that are unprepared. ![]() ![]() Android 13 adds a number of app-facing behavioral changes and APIs that tweak how apps can do work in the background, but not all of these changes were mentioned by Google at I/O earlier this month.
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