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philips77 avatar philips77 commented on June 11, 2024

Hi,
Thank for you issue. This indeed is not intended. As the scanner still works in Oreo+ when using PendingIntent, older systems should behave similarly.

The background task is removed due to this method:

Android-Scanner-Compat-Library/scanner/src/main/java/no/nordicsemi/android/support/v18/scanner/ScannerService.java

Lines 95 to 99 in 3cf0bd0

@Override
public void onTaskRemoved(final Intent rootIntent) {
super.onTaskRemoved(rootIntent);
stopSelf();
}

This method of a service is called when you swipe the task. After removing stopSelf(); from there may be two results:

  1. The service doesn't get killed.
  2. The service is killed and immediately recreated with the last Intent (if a proper flag is returned from onServiceStarted(Intent)).

Could you import the lib as a module, remove this method and check?

from android-scanner-compat-library.

fastrde avatar fastrde commented on June 11, 2024

Thank you for your quick response. The removal of stopSelf() does the trick. The service doesn't get killed. I'll check next if the service respond to my BLE Device after hours in the background and let you know.

from android-scanner-compat-library.

fastrde avatar fastrde commented on June 11, 2024

When the phone [Lollipop < affected version < Oreo] enters doze mode announcing devices are not found by the scanner. I think there is nothing that can be done about it (except asking the user for whitelisting), even foreground apps and services are restricted in doze mode.

See https://developer.android.com/training/monitoring-device-state/doze-standby

from android-scanner-compat-library.

philips77 avatar philips77 commented on June 11, 2024

I will address your findings in the new release.

from android-scanner-compat-library.

philips77 avatar philips77 commented on June 11, 2024

stopSelf() removed in 1.3.1.

from android-scanner-compat-library.

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