我不能在数据库中添加多个用户

Question

您好，我无法在数据库中添加多个用户。我想添加我的ArrayList中存在的所有用户。我的代码是：

 ArrayList<User> u = new ArrayList<>();
                                User user1 = new User("hely", "rrr", "wdssa", "2");
                                User user2 = new User("jess", "rrr", "sds", "2");
                            User user3 = new User("mark", "merinos", "dfgrh", "2");
                                u.add(user1);
                               u.add(user2);
                            u.add(user3);
                               ArrayList<User>user=u;
                            new Thread(new Runnable() {
                                @Override
                                public void run() {
                 Model_user.getInstance(getApplicationContext()).addUsers(user.toArray(new User[0]));
                                    Log.d("main_activity_user","ok user add");
                                }
                            }).start();

我的模型是：

public class Model_user {
    private static Model_user theinstance = null;
    private ArrayList<User> user_list;
    private static AppDatabase userDAOs = null;
    public static synchronized Model_user getInstance() {
        if (theinstance == null) {
            theinstance = new Model_user();
        }
        return theinstance;
    }

    public static synchronized Model_user getInstance(Context c) {
        if (theinstance == null) {
            userDAOs = Room.databaseBuilder(c, AppDatabase.class, "userdb").build();
            theinstance = new Model_user();
        }
        return theinstance;
    }

    private Model_user() {
        user_list = new ArrayList<User>();

    }
    public void addUsers(User[] s) {
        Log.d("main_activity_uid", "ok sta partendo");
        userDAOs.userDAO().insertAll(s);
        user_list.addAll(Arrays.asList(s));
        Log.d("main_activity_uid", "ok hai inserito crrettamente");
        return;
    }

因此，我只将第一个用户添加到数据库中，而不将其他用户添加到数据库中。如何在数据库中添加所有用户？

Answer 1

从addUsers（User.toArray（new User[0]）中删除“new User[0]”）

它应该是addUser（user.toArray（））