Push Notifications fail on specific Android phones

[zmz125000]

Push Notifications are not working properly on specific Android phones.

I use the word ‘ properly ’ because users receive push notifications when the app is open but not when it is closed, which defeats the purpose of push notifications.

I use the words ‘ specific Android phones ’ because this issue is noticed only on phones by manufacturers like Xiaomi, Oppo, One Plus, Vivo, Lenovo, Huawei, Vivo, Samsung, and a few others.

https://medium.freecodecamp.org/why-your-push-notifications-never-see-the-light-of-day-3fa297520793

这下面一堆用国产手机出问题的人
https://github.com/firebase/quickstart-android/issues/41

[zmz125000]

from Firebase Support:

When an app is killed, it should only be woken up by user action (i.e. if the user taps on the app icon). So if your app is not receiving FCM messages after it is killed, then that is expected. However applications should not be killed when swiped from the recent apps list-- this is incorrect behavior.

https://github.com/firebase/quickstart-android/issues/41#issuecomment-322154638