this gist describes how to 1. get an OAuth token from Android's AccountManager, 2. use this token to connect with GTalk via XMPP. Blog post about it: http://blog.tomtasche.at/2013/05/gtalk-and-oauth-on-android.html

connection.java

String user = "address@gmail.com";
String password = ""; // fill in the token previously acquired from AccountManager

SmackAndroid smack = SmackAndroid.init(context);

SASLAuthentication.registerSASLMechanism(GTalkOAuthSASLMechanism.NAME,
		GTalkOAuthSASLMechanism.class);
SASLAuthentication
		.supportSASLMechanism(GTalkOAuthSASLMechanism.NAME, 0);

ConnectionConfiguration configuration = new ConnectionConfiguration(
		"talk.google.com", 5222, "gmail.com");
configuration.setSASLAuthenticationEnabled(true);

connection = new XMPPConnection(configuration);
try {
	connection.connect();
	connection.login(user, password, "joppfm");
} catch (XMPPException e) {
  e.printStackTrace();
  // an error occured while connecting
}

GTalkOAuthSASLMechanism.java

// taken from: http://stackoverflow.com/a/10712949/198996
// note: you don't have to change anything in this class
public class GTalkOAuthSASLMechanism extends SASLMechanism {

  public static final String NAME = "X-GOOGLE-TOKEN";

	public GTalkOAuthSASLMechanism(SASLAuthentication saslAuthentication) {
		super(saslAuthentication);
	}

	@Override
	protected String getName() {
		return NAME;
	}

	@Override
	protected void authenticate() throws IOException, XMPPException {
		final StringBuilder stanza = new StringBuilder();
		byte response[] = null;

		stanza.append("<auth xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\""
				+ "mechanism=\"X-OAUTH2\"" + "auth:service=\"oauth2\""
				+ "xmlns:auth= \"http://www.google.com/talk/protocol/auth\">");

		String composedResponse = "\0" + authenticationId + "\0" + password;
		response = composedResponse.getBytes("UTF-8");
		String authenticationText = "";
		if (response != null) {
			authenticationText = Base64.encodeBytes(response,
					Base64.DONT_BREAK_LINES);
		}

		stanza.append(authenticationText);
		stanza.append("</auth>");

		Packet authPacket = new Packet() {

			@Override
			public String toXML() {
				return stanza.toString();
			}
		};

		getSASLAuthentication().send(authPacket);
	}
}

token.java

private void requestToken() {
  AccountManager accountManager = AccountManager.get(this);
  // normally you would ask the user which account to use for authentication here
	Account account = accountManager.getAccountsByType("com.google")[0];
	
	accountManager.getAuthToken(account,
			"oauth2:https://www.googleapis.com/auth/googletalk", null,
			this, new OnTokenAcquired(), null);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	super.onActivityResult(requestCode, resultCode, data);

	if (resultCode == RESULT_OK) {
		requestToken();
	} else {
		// user aborted authentication 
	}
}

private class OnTokenAcquired implements AccountManagerCallback<Bundle> {

	@Override
	public void run(AccountManagerFuture<Bundle> result) {
		Bundle bundle = result.getResult();

		Intent launch = (Intent) bundle.get(AccountManager.KEY_INTENT);
		if (launch != null) {
			startActivityForResult(launch, 0);
		} else {
      // this is the token to use later
			String token = bundle
					.getString(AccountManager.KEY_AUTHTOKEN); 
		}
	}
}

wtf is wrong with the gist editor? indentation looks fine in the editor, but eventually fucks up. sorry for that!