No, no, the question is not about the singleton itself. It's about an instance variable of the singleton.
Am Montag, 25. Februar 2013 16:36:39 UTC+1 schrieb bob: > > You are not using the singleton pattern properly. > > > You should access it with a getInstance method which will initialize it if > it is null. > > > > On Monday, February 25, 2013 3:52:30 AM UTC-6, user123 wrote: >> >> I have an instance variable in a singleton class which I'm using in all >> the app. It's basically a global configuration parameter. >> >> I initialize it in the first (launcher) screen of the app. The app will >> not continue without this initialization (where it's sure that the variable >> is not null). And I'll not use the variable before of this. >> >> After the variable is initialized, the value is never set again, only >> read. >> >> >> And I'm wondering, if there's any case where I can get a null pointer? >> Because e.g. the system kills the app while it's in the background, and >> tries to restart it in the last screen - since the variable is only >> initialized in the launcher screen, it will not be initialized? Does this >> case exist? >> >> I made a few tests - I stopped the app from settings. Then the app >> started from launcher screen, so everything fine. I also threw a >> RuntimeException from a random screen. After it, the system started the app >> from launcher screen, so again, fine. >> >> But I don't know if background app killed by the system behaves >> differently. Can't simulate that. >> >> And maybe there are other cases which I'm missing. >> >> So, is there any situation where my variable can become null? Or is this >> setup safe? >> >> Thanks in advance. >> > -- -- 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 --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
