facebook.logout(mainActivityContex);

或

facebook.logout(this);

在 Facebook SDK 中脸书.java--`

in Facebook SDK Facebook.java --`

public String logout(Context context)
        throws MalformedURLException, IOException {
    Util.clearCookies(context);
    Bundle b = new Bundle();
    b.putString("method", "auth.expireSession");
    String response = request(b);
    setAccessToken(null);
    setAccessExpires(0);
    return response;
}`