Example context: I open an app then I press device...

# android

[David Martin]

Example context: I open an app then I press device’s home button and I leave the app in the background, so how many second or minute this app will be terminate by Android?

[radityagumay]

we can't really measure that in time. since the OSs will do that for you

[radityagumay]

i mean it depends how long the OSs will let you app in tasks bar

[radityagumay]

e.g memory allocation, doze mode. app buckets, etc

[radityagumay]

but i think you can get that listener from onTerminate or utilize ProcessLifeCycleOwner

[David Martin]

So you meant there is no official document about this situation? I asked this question because an interviewer asked me, and him said I should figure it out by my self. Then I tested by using a phone which has 8GB RAM but run MIUI, and I open just 1 app, then I leave it 1 minute, then open it again and I saw the app started from beginning.
The second I tested using another phone has 8GB RAM but running a pixel_extended ROM(almost the same ROM in google pixel devices) and I saw despite I leaved the app for more than 1 hour and then reopen it, everything(UI, data) are kept.

[radityagumay]

So you meant there is no official document about this situation

about the time afaik is not. but implicit about that there're few docs
• https://developer.android.com/topic/performance/vitals/launch-time
• https://developer.android.com/topic/performance/vitals/launch-time
• https://developer.android.com/topic/performance/appstandby

[radityagumay]

some OSs manufacturers are aggressive, they have opt-in more restrictions than android plain OSs

[radityagumay]

you can't exactly now within X seconds the OSs will kill your app, it's totally depends the OSs itself by looking few constraints

[radityagumay]

e.g
• memory availability
• how many background tasks that you allow
• app buckets
• doze mode

[radityagumay]

https://tldp.org/LDP/tlk/mm/memory.html

[David Martin]

Thank you very much, I’m gonna read all above links

[radityagumay]

you're welcome!

[Colton Idle]

Activities aren't killed by themselves. Android will kill a process entirely. How long? Depends on the api level + manufacturer + the system process reaper which reclaims memory when in use.

Sounds like the interviewer was being a jerk IMO

[Tom Hermann]

Seems like they’d ask for strategies for dealing with process death instead of wanting some exact duration that isn’t defined. https://developer.android.com/guide/components/activities/process-lifecycle