Wendelin Uez <
wuez@online.de> wrote:
Some apps can receive news from their company server and show a message in the news list even if the app is closed, not active running.
The app's *window* gets closed. It is still active in background until
that memory is needed for a newly loaded app. The backgrounding is to
effect an image that apps load faster, because they weren't unloaded in
the first place.
Not many, but some apps will have an Exit or Quit option. For example,
Chrome does not, but Firefox has an option to Quit which actually
unloads that app instead of backgrounding it. That makes it possible to
use the purge-on-exit feature in Firefox to purge all locally cached
data on its exit.
Are these apps always running in background and polling their servers,
or does Android have a built in mechanism to receive such messages,
add them itself to the list and start and inform the app when the
message is selected by user?
Android does not exit apps on close, like Windows or Linux. Android backgrounds an app when you close its window, and the app remains loaded
until another app is loaded that needs the memory whereupon Android will
then unload the old backgrounded app. However, apps can designate
themselves as "sticky" which means they cannot be unloaded. A sticky
app that Android finds is missing will have Android reload it. Apps can
also run as services.
That's why app killer apps have a following. Some users don't want apps
to get backgrounded and running. They want an Exit function just like
they get with Windows and Linux. However, many users don't know how to
use killer apps. They try to kill apps that are sticky or services, so
the apps reappear right after using the killer apps. And users could
end up killing the wrong apps, or just some of them. While a manual
process, you can always go into Android settings -> Apps (or whatever is
your navpath to get to apps), select an app, and use [Force] Stop to
stop the app if it isn't sticky. The killer apps often do this
automatically, you you tap a button in the killer app to kill the
backgrounded apps. I so rarely have to kill an app, usually to force a
reload, that I found killer apps to be more trouble than they're worth.
Google is also coming out with auto-archive to free up storage space
(not memory space per se). See:
https://techcrunch.com/2023/04/11/google-launches-an-auto-archiving-feature-for-android-apps-to-save-space/
Oh joy, to install a new app, and old app, on prompt, gets uninstalled
but data saved in Google's cloud to reuse should you later decide to
reinstall, er, again run the app (from "archive").
No mention is this will be an OS think requiring some minimal version of Android, or if Google is adding more function to its Play Store app.
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