Code example for ConnectionResult

     * Signed in successfully connection state. 
    private static final ConnectionResult CONNECTION_RESULT_SUCCESS =
            new ConnectionResult(ConnectionResult.SUCCESS, null);
     * An invalid request code to use to indicate that {@link #signIn(int)} hasn't been called. 
    private static final int INVALID_REQUEST_CODE = -1;
    // The PlusClient to connect. 
    private PlusClient mPlusClient;
    // The last result from onConnectionFailed. 
    private ConnectionResult mLastConnectionResult;
    // The request specified in signIn or INVALID_REQUEST_CODE if not signing in. 
    private int mRequestCode;