title: Can't set checkbox state in onPrepareDialog
body: <p>I've got a dialog which shows a list of checkboxes. The info which boxes should be checked each time it opens comes from an edittext. I searched for a way to not allow caching of the dialog but couldn't find out how to do that. Now I override onPrepareDialog to set the checkboxes before the dialog opens. I deleted the content of my edittext, opened the dialog and there were still the same boxes checked... can anyone tell me how to reset the checkboxes?</p>
  
  <pre><code>    @Override
      protected void onPrepareDialog(int id, Dialog dialog) {
          ListView lv = ((AlertDialog) dialog).getListView();
  
          if (lv == null)
              return;
  
          boolean[] checked = cbDialog.setAndGetCheckedArray();
  
          String s = "onPrepareDialog... checked=";
          for (int i=0; i&lt;checked.length; i++)
              s+="["+i+"="+checked[i]+"]";
          System.out.println(s);
  
              // if edittext is empty, all entries in checked[] are false here,
              // but these changes do NOT affect the checkboxes in the dialog:
          for (int i=0; i&lt;checked.length; i++)
              if (checked[i])
                  lv.setItemChecked(i, true);
              else 
                  lv.setItemChecked(i, false);
      }
  </code></pre>