Thanks that fixed it! I created override of OnCreate in my application class and declared a new ArrayList. The only thing then puzzles me is why I had to do it?? I thought that it would automatically be filled with the object I created in my init function that is inside of the initial Activity class. I was thinking along the lines that this is like a pointer variable and then I set it with passing a pointer to my object. I guess it doesn't work that way :D
Thanks again!! On Apr 14, 2:47 pm, Chris <[email protected]> wrote: > 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
