You never instantiate mGroups in your Application class so unless you SET it before GETing it, it's going to be null.
Chris On Apr 14, 8:31 am, Duskox <[email protected]> wrote: > Hi all, > > so I searched the net and found a nice way to make a global variable > by creating a class that extends Application class. I did that. But I > am having problems with it. So this is the situation: > > public class Group { > public String mName; > public int mID; > public ArrayList<Items> mItems; > > } > > public class Item { > public String mName; > > } > > public class MyApplicationApp extends Application { > private ArrayList<Group> mGroups; > > public ArrayList<Group> getGlobalArrayVariable() { > return mGroups; > } > > public synchronized void setGlobalArrayVariable(ArrayList<Group> s) { > mGroups = s; > } > > } > > So these are the classes I believe are cruical for this question. Next > this is that in my Activity classes I set and get this ArrayList > variable. So I set it in my initial Activity class that is called when > the application is run. There I fill the array and just to be sure I > read it with Log functionality after filling the array in the > MyApplicationApp class and everything is ok. > > Then I try to read this from another Activity class where I go to > after a menu choice. In that activity I successfully read the > application, meaning I get a handle to MyApplicationApp object (I > guess). This is how I do it: > > ... > private MyApplicationApp mMyApp; > private ArrayList<Group> mGroupsList; > > protected void onCreate(Bundle savedInstanceState) { > super.onCreate(savedInstanceState); > > mMyApp = (MyApplicationApp)this.getApplication(); > if (mMyApp == null) Log.i(TAG,"mMyApp == null"); > > mGroupsList = > (ArrayList<Group>)mMyApp.getGlobalArrayVariable(); > if (mGroupsList == null) Log.i(TAG,"1. mGroupsList == null"); > > mGroupsList = > ((MyApplicationApp)this.getApplication()).getGlobalArrayVariable(); > if (mGroupsList == null) Log.i(TAG,"2. mGroupsList == null"); > ... > > So mMyApp is not null and that is fine I guess, but mGroupsList is > null and I presume that is way my app crashes after this last log > entry. I guess it crashes because my variable is null?? Anyway even if > the reason for crashing is other then this variable being null I am > still puzzled why am I not able to get my global variable in this > way?? > > The reason for two different ways of getting something into > mGroupsList variable is because I was trying to see if I am doing it > incorrectly but it is the same as far as I know... > > Any ideas or pointers what should I do? > > Thanks! > D. -- 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
