没用过这个库，不过看错误信息，问题应该在这句：

jsonstring abc = gson.fromJson(jsonfile,jsonstring.class);

提示java.lang.IllegalStateException: Expected a string but was BEGIN_ARRAY。
你确定gson.fromJson(jsonfile,jsonstring.class)返回的类型是jsonstring吗？

对应的是user对象。。。
{}中间的是对象（或者Map），[]中间的才是数据（或者List）

它对应的应该是java里面的字典类型，因为他是一个键值对，你可以用hashtable等数据结构来存储

很明显啊，就是一个普通的对象。
而且根据json创建对应的类，应该用插件，直接避免了你这种问题。

private UserBean user;
public static class UserBean {
    private int id;
    private String screen_name;
    private String name;
    private String province;
    private String city;
    private String location;
    private String description;
    private String url;
    private String profile_image_url;
    private String domain;
    private String gender;
    private int followers_count;
    private int friends_count;
    private int statuses_count;
    private int favourites_count;
    private String created_at;
    private boolean following;
    private boolean allow_all_act_msg;
    private String remark;
    private boolean geo_enabled;
    private boolean verified;
    private boolean allow_all_comment;
    private String avatar_large;
    private String verified_reason;
    private boolean follow_me;
    private int online_status;
    private int bi_followers_count;