/**
* Starts an asynchronous load of the data. When the result is ready the callbacks will be called
* on the UI thread. If a previous load has been completed and is still valid the result may be
* passed to the callbacks immediately.
*
* <p>Must be called from the UI thread.
*/
@Override
protected void onStartLoading() {
// XXX: do we really return the cached results _before_ checking if the content has changed?
if (cachedResults != null) {
deliverResult(cachedResults);
}
if (takeContentChanged() || cachedResults == null) {
forceLoad();
}
// watch for data changes
dao.registerObserver(this);
}
