Well basically because if I want to do some background processing
(playing music, tracking location etc.) while the user is doing other
things I would want my process to use memory as little as possible so
that the system wouldn't kill it. But if my UI i.e. Activities stay in
the memory even when they are not used it makes the background process
more likely to be killed.
The size of your process doesn't make it more likely to be killed.
And again, if your activity is actually being finished (by you calling finish() or the system doing that for you as a result of you pressing back in it), then all of the objects associated with the activity will be released. Unless you have leaked some references to it, such as in static variables. You can use the hat tool to look at the objects in your process, and follow the references to see why some aren't being garbage collected.
Of course if you press home to leave the app, then the activity is still in use, and will remain around if or until the process is killed. If you want to reduce memory use while in this state, you can put code in onStop() to free up any heavy-weight resources (such as large bitmaps), and reload them on onStart() on onRestart().
I also tried using some memory extensive
apps (Maps, Browser, Camera) but the system still didn't free the
activities of my app.
Using memory in other apps has -nothing- to do with "freeing" memory in your app. All it can result in is some not-needed processes being killed if the kernel is running low on available memory.
Sorry, I don't have time to debug your app.
Dianne Hackborn
Android framework engineer
hackbod@android.com
Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them.
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