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smack 4.1.7  Vcard return null, while ProviderManager add vcard IQ

Question asked by scanor on Jul 25, 2016
Latest reply on Oct 28, 2016 by scanor

I have add this line:

ProviderManager.addIQProvider("vCard", "vcard-temp", new VCardProvider());


xmppConnection = new XMPPTCPConnection(config);

but when I call these line:

VCardManager manager = XmppManager.getManager().getVCardManager();

if (manager.isSupported(entry.getUser())) {//return false

  vCard = manager.loadVCard(entry.getUser());

//or directly call vCard = manager.loadVCard(entry.getUser()); //return null

any help will be grateful。

At last, I would like to say sorry about my poor English , I can read but I can't write~~~