Android XMPP simple chat: Login error SASL authentication failed using mechanism PLAIN

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Mobile

Android

Chat

XMPP

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I'm new to android and as the title says I'm trying to build very simple chat with the following code.

//1. connection
ConnectionConfiguration connConfig = new ConnectionConfiguration("talk.google.com", 5222, "gmail.com");
try{ connection.connect();}
catch (XMPPException ex)
{
 connection = null;
 return;
}

//2. login
try{  connection.login(myGmailLogin,myGmailPwd); }
catch (XMPPException e)
{
  report+="Login error " + e.toString() ;
  return;
}

What i get Is: Login error SASL authentication failed using mechanism PLAIN.
After I while I discovered that Google does not allow PLAIN authentication on the insecure connection so I added the line
connConfig.setSecurityMode(SecurityMode.required);
but I always get the same errror as before.
can anyone please help me? thanx a lot!