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.
