Notification slightly delayed

[felixwiemuth]

Notifications are sometimes shown delayed when the device sleeps. The delays I observed ranged from a few seconds up to around 4:30 minutes. However, when turning the screen on after the reminder's due time, the notification shows immediately.

This also seems to be reproducible to some extend. The procedure I used is:

• Schedule a reminder for 5 minutes ahead (or even with only 2 minutes ahead)
• Around one minute before due time, turn screen off
• Turn screen on a few minutes after due time or wait until the notification eventually comes

See also #13.

Using the app over months, I did not notice this often and there don't seem to be more severe delays.

Device, OS and version information

• Device: Pixel 4a
• OS: Android 11 (GrapheneOS RQ2A.210505.002.2021.05.19.06)
• App version: 0.9.7, 0.9.8-alpha1 (not released)

Conditions

• Battery optimization off for SimpleReminder
• Energy save off
• Battery 81% at due time
• Flight mode
• Wifi and Bluetooth off

Possible reasons

The app uses IntentService to show the notification when due. The documentation says:

IntentService will not work correctly when the application is in the background on the latest versions of Android.

The IntentService class was deprecated in API 30 (Android 11). It seems a bit strange that already when running on Android 11 it would fail to work correctly but this could be the reason for the delay.

Possible solution

I will change the implementation to not use IntentService which hopefully solves the problem.

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If anyone experiences this or a similar problem, please comment and provide information about the circumstances (especially device and Android information).