Not sure if this helps, but use
http://developer.android.com/reference/java/lang/System.html#identityHashCode(java.lang.Object)
to check whether the Application object is indeed the same in both
cases (or whether they are in different DVMs)
On Apr 20, 12:04 pm, patbenatar <patbena...@gmail.com> wrote:
> Bob-
>
> Nope, I'm using getApplication()
>
> For instance [inside an Activity]:
>
> MyApplication application;
>
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> application = (MyApplication) this.getApplication();
>
> }
>
> The error is most easily re-produceable when I am in Activity B, after
> A started it for result, and then click a button in B to launch Maps
> with an Intent to search for an address, then from Maps I hit Home
> then my launcher icon on my Home Screen to go back into my app--BAM!
> Activity B fails onResume with a NullPointerException coming from a
> getter method on my MyApplication class, when I know for sure Activity
> A properly set the data in MyApplication..
>
> So strange...
>
> Thanks,
> Nick
>
> On Apr 20, 2:18 am, Bob Kerns <r...@acm.org> wrote:
>
>
>
>
>
> > I do this, without any issues at all.
>
> > How are you getting your Application instance from your activities?
> > not getApplicationContext() I hope...
>
> > Have you examined the state from the debugger? There may be something
> > you're missing about the state of things.
>
> > On Apr 19, 11:41 pm, patbenatar <patbena...@gmail.com> wrote:
>
> > > Hey all-
>
> > > I am using an Application object to store app-wide instance data--data
> > > that I need to remain in existence for the entire lifetime of the app,
> > > so the Application class seems like the proper place to put it. I have
> > > just finished reading this
> > > threadhttp://groups.google.com/group/android-developers/browse_thread/threa...
> > > that goes into pretty good detail and receives confirmation from
> > > Googler hackbod as to how the Application class performs--and from
> > > that info it seems this strange behavior I am receiving should not be
> > > happening...
>
> > > Basically, every once in a while when I resume my app in any of its
> > > Activities (it is still running in memory so onCreate is not called) I
> > > get NullPointerExceptions because instance variables in my Application
> > > class are returning null when I request them from my Activity (via a
> > > getter method in my custom Application class). It seems as if
> > > sometimes Android saves the states of my Activities but deletes all my
> > > instance variable data... This can't be an Android problem--there must
> > > be something wrong with my code.
>
> > > Has anyone else ever ran into an issue of this kind? Any ideas as to
> > > what may be causing this? I'm not going to post my code here as that
> > > won't help anyone, but hopefully someone can point me in some helpful
> > > directions.
>
> > > Thanks so much,
> > > Nick
>
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