Jason, you're right, thats exactly what I've been doing. And mark, you're also right, I've been passing "this" to the constructor...
On Aug 11, 6:53 pm, Jason Proctor <[email protected]> wrote: > i have this problem quite a lot -- how to get context when off in > some callback somewhere. usually i arrange to pass a context in as a > construction parameter and then provide that for the calls that need > it. works for me! > > g'luck > j > > > > >Jason, thanks a lot, it turns out the context is null... See if you > >can help me... > > >An Alarm starts a "WakefulIntentService"( made by me, which is used to > >keep a wakelock). That extends an "IntentService" (made by android). > >This WakefulIntentService then writes data, passing itself as an > >argument for the context. > >I'm guessing IntentServices don't count as a "Context", even though > >Intents and Services do count. > > >Any idea how I can get a context by using a static method, or at least > >get the right FileOutputStream (for the current application)? > > >I appreciate your help a lot, > >Brandon Nalls > > >On Aug 11, 4:54 pm, Jason Proctor <[email protected]> > >wrote: > >> ok so if that's throwing a null pointer, then context might be null. > >> check that? > > >> >I commented out a lot of code above what I pasted.... if comments > >> >count as lines, line 39 is "FileOutputStream fOut = > >> >context.openFileOutput(filename, Context.MODE_PRIVATE);" > > >> >Never heard of a finally block... it sounds like it isn't getting > >> >called, i'll look into adding this. > > >> >I'm positive filename & contents aren't null. > > >> >On Aug 11, 4:44 pm, Jason Proctor <[email protected]> > >> >wrote: > >> >> what is line 39 in your source file? > > >> >> are the filename and contents non-null? > > >> >> btw, i'd recommend closing the output stream writer in a finally > >> >> block. finalizers aren't guaranteed to get called. > > >> >> >I have two methods, one reads files and one writes the given string > >> to > >> >> >a file. > >> >> >For some reason, the first time the write method works fine, but > >> after > >> >> >it writes the first file, any files after that makes it throw a > >> >> >nullpointerexception. No idea why. The problem is in the writeData > >> >> >method for sure.... why is it throwing null??? > > >> >> >Stack dump: > >> >> >08-10 23:04:43.309: WARN/dalvikvm(687): threadid=17: thread exiting > >> >> >with uncaught exception (group=0x4000fe70) > >> >> >08-10 23:04:43.319: ERROR/AndroidRuntime(687): Uncaught handler: > >> >> >thread IntentService[TheDaemon] exiting due to uncaught exception > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): > >> >> >java.lang.NullPointerException > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): at > >> >> >org.myApp.ThePreferences.writeData(ThePreferences.java:39) > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): at > >> >> >org.myApp.ThePhone.savePhoneToDisk(ThePhone.java:33) > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): at > >> >> >org.myApp.ThePhone.refreshStatus(ThePhone.java:82) > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): at > >> >> >org.myApp.TheDaemon.onHandleIntent(TheDaemon.java:62) > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): at > >> >> >android.app.IntentService$ServiceHandler.handleMessage > >> >> >(IntentService.java:29) > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): at > >> >> >android.os.Handler.dispatchMessage(Handler.java:99) > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): at > >> >> >android.os.Looper.loop(Looper.java:123) > >> >> >08-10 23:04:43.357: ERROR/AndroidRuntime(687): at > >> >> >android.os.HandlerThread.run(HandlerThread.java:60) > > >> >> >write Method > > >> >> >public boolean writeData(String filename, String contents) > >> >> > { > >> >> > try { > >> >> > FileOutputStream fOut = > >> >> >context.openFileOutput(filename, > >> >> >Context.MODE_PRIVATE); > >> >> > OutputStreamWriter osw = new > >>OutputStreamWriter(fOut); > >> >> > osw.write(contents); > >> >> > osw.flush(); > >> >> > osw.close(); > >> >> > } catch (IOException e) { > > > >> > e.printStackTrace(); > >> >> > Log.e("fmi", "fmi throws ioexception in WRITER"); > > > >> > return false; > >> >> > } catch (java.lang.NullPointerException e) { > >> >> > e.printStackTrace(); > >> >> > } > >> >> > return true; > >> >> > } > > >> >> >Any idea why it's throwing a null pointer exception? > > >> >> -- > >> >> jason.software.particle > > >> -- > >> jason.software.particle > > -- > jason.software.particle --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
