On Fri, Dec 17, 2010 at 1:44 AM, Hans-Erik <erikswed...@gmail.com> wrote:
> On scenario is if 200 phones connect to my server wanting to send one jpg > to another phone. > What are the odds that 200 devices are going to perform the same action at the same time? I guess if you have a significantly large user base, but I'm assuming that's not the case, or is it? > 200 messages would go out trough google notifying all phones there is jpg > package for them. > Google has Limitations in that C2DM about "Google limits the number of > messages a sender sends in aggregate". Also possible lagging. > Is some lagging or some delay in the delivery of these messages completely unacceptable? What is so urgent about these messages that they *must* be received instantaneously? And regardless, there will always be some delay or lagging due to users's network restrictions. > My initial naive thought was that all those 200 phones could have an app > installed that make a connection to me PC server and keep that connection > alive. > There's really no such thing as "keeping a connection alive". Your process can and will be killed at some point, if not by the system then explicitly by the user. > I'm searching for a best way to do do this. What would you do? > I would rethink what you're trying to accomplish and try to work within the restrictions imposed by mobile devices. Perhaps give the user a "poll interval" or an option for manually refreshing the data, if it makes sense for your app. > - Services are bad design and a user might think his battery get drained > - Activity with AsyncTask is beautiful if android not killing the app Hmmm > (not sure there). > One AsyncTask constantely listening for incoming and another AsyncTask gets > created when user send jpg. Can an AsyncTask live that long, Is it possible > to protect the AsyncTask from onCreate updates, orientationchanges? > You can certainly keep your AsyncTask alive between orientation changes - but only as long as the user keeps your app in focus as the current Activity. Once you get put in the background you're subject to being killed. ------------------------------------------------------------------------------------------------- TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
