If you download the source tree (if it ever comes back up again), I think you might find an interesting read in the code that starts up an application, I think ActivityThread. It's not too much code, mostly calling instrumentation in the right places, and provides a nice read for any systems experienced android hacker, if only to convince you that there's not something much more complex happening under the covers :-)
Kris On Sat, Oct 8, 2011 at 6:30 PM, DraganA <[email protected]> wrote: > My bad, I just realised I do call finish in onCreate and return before > the variable is initialised. Kostya explained most of it. Thanks. > > On Oct 8, 6:30 pm, Kostya Vasilyev <[email protected]> wrote: >> Calling finish() from onCreate still results in onDestroy getting called. >> >> So if your onCreate calls finish() and returns -- before you initialize >> the list -- perhaps as part of displaying the license agreement, or >> something else along those lines -- then in onDestroy the list will >> still be null. Kaboom! >> >> So, +1 to Studio's advice of an if(!null) check. Or else create the list >> as a member initializer: >> >> class MyActivity { >> private List<String> list = new ArrayList<String>(); >> .... >> >> } >> >> -- Kostya >> >> 08.10.2011 21:12, Studio LFP ?????: >> >> >> >> >> >> >> >> >> >> > Without code samples, I don't think anyone is going to be able to help >> > you find your issue. I use this all the time and the only time I have >> > seen it not work was when I made a mistake somewhere else in the code. >> >> > I do usually do a null check on things in the onDestory before I use >> > them because my code can get more complicated as it goes. I end up >> > changing variables along the way forgetting I'm cleaning them up at >> > the end. >> >> > If you do find a serious bug like this, you'd definitely want to go >> > through the steps to reproduce it and post a bug reports in the >> > Android Issue Tracker if someone else hasn't found it already. >> >> >http://code.google.com/p/android/issues/list >> >> > Steven >> > Studio LFP >> >http://www.studio-lfp.com >> >> > On Saturday, October 8, 2011 11:53:05 AM UTC-5, DraganA wrote: >> >> > That's the problem, the list is created in onCreate() method and is >> > not reassigned or set to null anywhere. I forgot to say, the null >> > pointer happens in onDestroy() method in list.clear() line. From that >> > I can only deduce that onDestroy() is called before onCreate() >> >> > On Oct 8, 5:42 pm, Studio LFP <[email protected]> wrote: >> > > Based on that, you shouldn't get a crash, but obviously that's >> > not the full >> > > code you are using. >> >> > > Are you changing that variable at any other point in the code? >> >> > > Steven >> > > Studio LFPhttp://www.studio-lfp.com<http://www.studio-lfp.com> >> >> > > On Saturday, October 8, 2011 3:34:15 AM UTC-5, DraganA wrote: >> >> > > > I'm puzzled as to why I'm getting Null pointer exception in the >> > > > construct below, knowing the Activity life cycle, it shouldn't >> > happen. >> > > > Could the clue be in TabActivity?? >> >> > > > public class Main extends TabActivity { >> >> > > > private List<String> list; >> >> > > > public void onCreate(Bundle savedInstanceState) { >> > > > list = new ArrayList<String>(); >> > > > } >> >> > > > protected void onDestroy() { >> > > > list.clear(); >> > > > } >> > > > } >> >> > -- >> > 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 >> >> -- >> Kostya Vasilyev > > -- > 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 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
