StableArrayAdapter.java

public class StableArrayAdapter extends ArrayAdapter<Contact> {

    HashMap<Contact, Integer> mIdMap = new HashMap<Contact, Integer>();

    public StableArrayAdapter(Context context, int textViewResourceId, List<Contact> objects) {
      
      super(context, textViewResourceId, objects);
      
      for (int i = 0; i < objects.size(); ++i) {
    	  mIdMap.put(objects.get(i), i);
      }
      
      
    }

    @Override
    public long getItemId(int position) {
      Contact item = getItem(position);
      return mIdMap.get(item);
    }

    @Override
    public boolean hasStableIds() {
      return true;
    }

  }