I'm trying to implement a Select All menu item for a ListView in a ListViewActivity. The relevant parts of my ListViewActivity:

```
public class MyListViewActivity extends ListActivity
{

   @Override
   protected void onCreate(Bundle savedInstanceState)
   {
      super.onCreate(savedInstanceState);

      ArrayList<String> data = createDataList();      
      setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, data));
      getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
      getListView().setItemsCanFocus(false);
   }

   @Override
   public boolean onMenuItemSelected(int featureId, MenuItem item)
   {
      if (item.getItemId() == R.id.delete)
      {
         //TODO: delete the checked items
         return true;
      }
      if (item.getItemId() == R.id.select_all)
      {
         for (int i = 0; i < getListView().getCount(); i++)
            getListView().setSelection(i);
         return true;
      }
      return super.onMenuItemSelected(featureId, item);
   }

```

I've browsed around stackoverflow.com and the google; the above is something that should work. But it doesn't. `setSelection(i)` appears to be the method I want to call on ListView but it's not working as advertised.

What am I doing wrong? Is this even possible on Android in code?