检查Parse中的用户存在以自动登录

Question

我正在尝试检查用户之前是否已登录，使用Parse，如果有，则应将它们带到MainForm，但如果没有，则应将用户带到LoginForm。

ParseUser currentUser = ParseUser.getCurrent();
    if (currentUser != null) {

        new MainForm(theme).show();

    } else {

        new LoginForm(theme).show();
    }

但它给了我错误，我不知道我做错了什么，请帮忙。

Answer 1

您是否考虑过将用户信息保存到首选项中？

来自聊天应用演示项目：https://www.codenameone.com/blog/building-a-chat-app-with-codename-one-part-2.html

    // if the user already logged in previously and we have a token
    String t = Preferences.get(tokenPrefix + "token", (String)null);
    if(t != null) {
        // we check the expiration of the token which we previously stored as System time
        long tokenExpires = Preferences.get(tokenPrefix + "tokenExpires", (long)-1);
        if(tokenExpires < 0 || tokenExpires > System.currentTimeMillis()) {
            // we are still logged in
            showContactsForm(data);
            return;
        }
    }