how come? arent foreground services cool anymore to not have the process killed?

I have never built a chat app, but

Foreground services must display a Notification.

isn’t this a reason for it? Whatsup is using Foreground services for backing up data for sure, the rest should happen seamlessly in background. Is there any reason why you are looking into foreground services?

because without foreground service uploading the big file, when going to background, you are background status, which is elligible for killing, while fg service is higher status, making it less likely to get killed upon mem pressure

Use work manager

why, isnt that a wrapper around job scheduler also? file upload in chat needs to be immediate

but it'll be done in background and it can be observed inside activity/fragment

sorry thats not the point. point is why they dont use fg service in order not to get killed in bg

with new background restrictions fg service might get killed when memory is low but work manager will finish its work, may be later then expected. You can also achieve the same with fg service but WM is easier to implement

fg service is exempt from bg restrictions afaik

it's not exempted...it's just that it rarely happens if it is long-running, cpu intesive then it might get killed

i think you are conflating things. processes get killed on memory pressure by order of they rank, bg is lowest, fg service is middle, foreground is top

thanks for clearing it up and ur last observation is quite true.

Havent decided yet, got to know first if server supports upload resuming