Android :: Update Doesn't Work When Using Content Resolver?

I have this code for update:
public Boolean update() {
try {data.put(Contacts Contract.Groups.SHOULD_SYNC, true);
Content Resolver cr = ctx.get Content Resolver();
Uri uri = Content Uris.with Appended Id(Contacts Contract.Groups.CONTENT_URI, Long.parse Long(get Id()));
int mid = cr.update(uri, data,_ID+"="+get Id(), null);
// notify registered observers that a row was updated
ctx.get Content Resolver().notify Change(
Contacts Contract.Groups.CONTENT_URI, null);
if (-1 == mid)
return false;
return true;
} catch (Exception e) {
Log.v(TAG(), e.get Message(), e);
return false.