I've isolated the problem and this has nothing to do with ArrayList or Vector and everything to do with Garbage Collector. Both of those are working fine exactly as I coded them when I run the code in an isolated activity. Apparently GC is destorying my activity and recreating it and my onSaveInstanceState()/onRestoreInstanceState() code isn't working correctly.
On Thursday, July 5, 2012 1:35:07 PM UTC-7, alex b wrote: > I saw the notice about the syncronization of the Vector type, but it > didn't help me find a solution to the problem. What I believe i need to do > is... > > lock the ArrayList, Vector whatever > update the ArrayList > unlock the ArrayList > > but I don't know how to accomplish this. > > > > On Tuesday, July 3, 2012 1:36:58 PM UTC-7, RichardC wrote: > >> I don't think Vector is thread safe in the way you expect did you read: >> >> *"This class is equivalent to >> ArrayList<http://developer.android.com/reference/java/util/ArrayList.html> >> with >> synchronized operations. This has a performance cost, and the >> synchronization is not necessarily meaningful to your application: >> synchronizing each call to get, for example, is not equivalent to >> synchronizing on the list and iterating over it (which is probably what you >> intended). If you do need very highly concurrent access, you should also >> consider >> CopyOnWriteArrayList<http://developer.android.com/reference/java/util/concurrent/CopyOnWriteArrayList.html> >> . " >> * >> http://developer.android.com/reference/java/util/Vector.html >> >> The implication of the above is that your Vector change be changed from >> another thread whilst you are trying to serialize it. >> >> >> On Monday, July 2, 2012 8:52:46 PM UTC+1, alex b wrote: >>> >>> I have an activity that contains a private Vector<myobject>, thread safe >>> version of ArrayList. The activity adds items to the ArrayList, and in >>> onSaveInstanceState() I save the data (see code below). The problem is >>> that it looses items and it seems to have after the GC runs. So what am I >>> missing? >>> >>> >>> private static RecentItems _lstRecent; >>> >>> @Override >>> public void onCreate(Bundle savedInstanceState) { >>> >>> super.onCreate(savedInstanceState); >>> setContentView(R.layout.main); >>> >>> restoreRecents(savedInstanceState); >>> } >>> >>> @Override >>> protected void onSaveInstanceState(Bundle outState){ >>> super.onSaveInstanceState(outState); >>> >>> String s=serializeIt(_lstRecent); >>> bundle.putString("lstRecent", s); >>> } >>> >>> @Override >>> protected void onRestoreInstanceState(Bundle outState){ >>> super.onSaveInstanceState(outState); >>> >>> this.restoreRecents(outState); >>> } >>> >>> private void restoreRecents(Bundle bundle){ >>> if (bundle!=null){ >>> String s = bundle.getString("lstRecent"); >>> _lstRecent=deserializeIt(s); >>> } >>> >>> if (_lstRecent ==null) >>> _lstRecent=new RecentItems();//unt >>> >>> } >>> >>> -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
