I have my code for Google+ Sign-in, what more to do to conect?

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http://stackoverflow.com – So this is my code: public class Login1 extends Activity implements ConnectionCallbacks, OnConnectionFailedListener, OnClickListener, OnAccessRevokedListener { private static final String TAG = "SignInTestActivity"; private static final int OUR_REQUEST_CODE = 49404; private PlusClient mPlusClient; private boolean mResolveOnFail; private ConnectionResult mConnectionResult; private ProgressDialog mConnectionProgressDialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login1); mPlusClien (HowTos)