A singleton will live as long as an Application (until the process is killed). It may be created later, since it isn't created until needed, so that is a bonus feature.
Good point about onLowMemory(); that is only available by subclassing a context (either an activity, service, or application). On Mon, Nov 8, 2010 at 10:27 PM, joebowbeer <[email protected]> wrote: > Is there any difference in lifetime/scope between a custom Application > and a singleton class? > > My understanding, based on previous postings in this group, is that > the class loader (singleton) has the same lifetime as its process, and > that a single process may be reused by subsequent instances of an app. > Is this correct? If so, then the singleton may "live" longer than the > analogous custom application instance, right? > > Another apparent advantage of the custom Application is the > onLowMemory method. Is this actually useful in practice? As I recall, > Application.onTerminate is not called reliably. > > On Nov 1, 3:02 pm, Dianne Hackborn <[email protected]> wrote: > > Yes the application object is always created before any other of your > > components in the process. > > > > There is no need to use the application class to implement singletons > (that > > part of the docs is totally wrong, I just put in a change to get rid of > it). > > I suggest avoiding that entirely and just write a singleton without it. > > > > On Mon, Nov 1, 2010 at 3:49 PM, Federico Paolinelli <[email protected] > >wrote: > > > > > > > > > > > > > > > > > > > > > In a book I read, the author suggests to extend the application class > > > in order to have a place to be used as a singleton. In this way, it is > > > easy to make some initialization stuff in it onCreate(). > > > > > Now my question: if my application has also some broadcast receivers > > > declared in the manifest, and the application was not started > > > explicitly, or it was but then the os reclaimed it resources back, > > > what will be happening if the broadcast receiver is triggered? Will > > > the onCreate of the application class be called first? > > > > > Thanks in advance, > > > > > Federico > > > > > -- > > > 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]<android-developers%[email protected]><android-developers%2Bunsubs > [email protected]> > > > For more options, visit this group at > > >http://groups.google.com/group/android-developers?hl=en > > > > -- > > Dianne Hackborn > > Android framework engineer > > [email protected] > > > > 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. > > -- > 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]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- Dianne Hackborn Android framework engineer [email protected] 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. -- 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
