从数据库中检索数据以使用房间显示用户配置文件信息

Question

I have set up a login and signup system but I need a profile page to print the information of that user and I am struggling with it. So far I have created the page and where I want it all to be printed. The code I have so far is:

package com.example.moneymanagment;

import android.os.Bundle;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import com.example.moneymanagment.models.Users;

public class ProfileActivity extends AppCompatActivity {

    private TextView name, surname, email, expenditure, leftover;
    private Users users;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile_activity);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        users = (Users) getIntent().getSerializableExtra("Users");

        name = findViewById(R.id.tvFname);
        surname = findViewById(R.id.tvSname);
        email = findViewById(R.id.tvEmail);
        expenditure = findViewById(R.id.tvExpenditure);
        leftover = findViewById(R.id.leftover);

        if (users != null) {
            name.setText(users.getName());
            surname.setText(users.getLastName());
            email.setText(users.getEmail());
        }else {
            name.setText(users.toString());
        }

    }
}

After testing it, I have found that it is not meeting the if condition; the user is currently at null despite me logging in. I have another activity in my project that displays the user's name after the login and I used that code as a reference but it does not seem to work.

Please let me know if you need more information. Thanks, guys

Answer 1

Is your Users class implementing Serializable? It must do so in order to deserialize the "Users" extra from the intent

Answer 2

If I understand correctly you want to know how to use Room to store the Users data. This is all on the android developers website. Here you can see how to use Room in your project. Andhere you can see some resources that will help you to better understand how to use Room database. They explained it really well, but if you have any doubts you can ask me and I will try to help you. I used Room to make a database with more than 10 tables so I have research the topic a lot in the last few months