20 March 2019

Android 9 does not show notifications from WhatsApp and Viber

After updating my Nokia 5.1 Plus from Android 8.1 to Android 9, I noticed that after a while I am not receiving notifications from any messengers like WhatsApp or Viber. This should not happen!

Method №1 (Official)

To fix this you need to perform 4 steps:

1) Turn "Adaptive Battery" on.
Settings → Battery → Adaptive Battery → On

2) Specify applications that do not need to be optimized.
Open "Settings → App & notifications → Advanced → Special app access → Battery optimization → All apps" and then open needed apps (e.g. WhatsApp or Viber) and choose "Don't optimize".

3) Check app's notifictions settings.
Open "Settings → App & notifications → <Needed application> → Notifications" and make sure that all necessary options are turned on.

4) Reboot the phone.


To make sure that the function "Adaptive Battery" does not optimize your applications open "System - Advanced - Developer options (Unlock Developer Options on Your Pixel in Android 9.0 Pie) - Apps - Standby apps". Applications must be in EXEMPTED state.

More information about "Adaptive Battery" can be seen in https://developer.android.com/about/versions/pie/power.

Method №2 (unOfficial)

Until all bugs with the unloading of applications from RAM are resolved, this solution is more reliable.
This https://dontkillmyapp.com site was created specifically to solve such problems.

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