Hi all, I ported an app to android that sends and receives messages, sometimes interactively, sometimes doing the upload/download in the background. My app has a bunch of singletons - using the static getInstance() pattern - that handle things such as the network, database etc. and also a bunch of activities which access the singletons' data whenever they're visible via getInstance() etc. Some of these singletons have Executors of small thread pools. Also, I use C2DM to poke the app when an incoming message arrives.
>From my non-android background I wrote it so that these thread pools and static instances would keep the process alive indefinitely, albeit non doing any processing and hopefully using minimal amounts of memory/battery (just so I could avoid class loading etc.). However from what I've read it seems that maybe some of this should be in a service - I'm trying to figure out the reasons why I should do this, as the app seems to work just fine at the moment - I would be hugely grateful if anyone could tackle some of the questions below: 1. If I leave things as they are am I more or less likely to be killed in times of low memory? My process doesn't show up in the "Running" column, yet I can see it in DDMS 2. My c2dm broadcast receiver handles the intent, and schedules a runnable in one of those process-level singletons, then returns. The whole trip completes in milliseconds. Is this robust? Or would (for some reason) having that singleton's processing in a service be more "correct" ? 3. If my singletons have a static "instance" variable, can the object-level member variables ever be eligible garbage collection if they are set to null at some point? 4. Finally I've read in this group that android re-uses linux processes for new Application/Activities etc. to reduce overhead - in this case, what happens to process-level static objects - do they also hang around? I suppose I'm really looking to see what happens under the hood at the kernel process level, and in times of low memory if I switch static-instance singletons to members of a service class. I'm coding to 2.2 APIs. Thanks a lot in advance for any help -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
