AQuery AJAX缓存

How to get Android AQuery to download data from the Internet, if possible, otherwise - from the cache ??? My code:

final GetFeedsAjaxCallback ac = new GetFeedsAjaxCallback(...);
aq.ajax(feed, XmlDom.class, -1, ac);

My code does not work if there is no internet connection.

use code:

    AQuery aq;
    //...
    final GetFeedsAjaxCallback ac = new GetFeedsAjaxCallback(...);
    aq.ajax(feed, XmlDom.class, -1, ac);

...

if (status.getCode() != 200 || xml == null)
try {
     xml = new com.androidquery.util.XmlDom(new FileInputStream(aq.getCachedFile(url)));
    }
    catch (Exception e){}
 //do something