How to add user registration data into the Firebase database?

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In this tutorial, I am going to show you how to add user registration data into the firebase database. Make sure you follow all my process and leave a comment below, if I did not explain in details.

Step 1: Connect Firebase

First of all, you need to connect your Android project to the firebase and add the required dependencies. If you don’t know how can you connect your project to a firebase, read this tutorial first which shows a firebase connection process.

How to connect Firebase?

Step 2: Connect Firebase Database

Click on the Tools -> Firebase to connect Firebase database like Firebase Authentication.

It will open the Firebase tab like the below image. Click on Realtime Database -> Get Started with Realtime Database -> Add Database. Follow the process to complete.

Now, you can open your Firebase console. Click on Realtime Database.

You will see an empty database with the root node and null value.

Click on rules, you need to change the Firebase database rules and allow only authenticated users to read and write data. So, replace the old Firebase rules with these new rules.

{
  "rules": {
    "users": {
      "$userId": {
        // grants write access to the owner of this user account
        // whose uid must exactly match the key ($userId)
        ".read": "auth != null && $userId === auth.uid",
        ".write": "auth != null && $userId === auth.uid",
      
      }
    }
  }
}

Step 3: Create User.java class

Now, lets go to the coding part. You have already created an authenticated registration form from step 1 tutorial. Now, this time we are going to add that data to the Firebase Database.

First, create a separate User.java class and generate getter and setter of the data, and create constructors. See a code below User.java.

package com.elsebazaar.bottlecollections;

public class User {
    public String name;
    public String email;


    public String password;

    public User(){
    }

    public User(String name, String email, String password){
        this.name = name;
        this.email = email;
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


}

Step 4: Add code to Register.java

This below code is used to add data to the Firebase

 FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
 DatabaseReference databaseReference = firebaseDatabase.getReference();//databasereference

String uid = currentUser.getUid();
DatabaseReference userRef = databaseReference.child("users");//Create child node reference
userRef.child(uid).setValue(user);//Insert value to child node

Here is a complete code using during registration. The data should only add to the Firebase database after authentication success and user clicked the register button. So, the above code is added inside the register button onClicked method.

package com.elsebazaar.bottlecollections;

import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;

import androidx.annotation.NonNull;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.android.material.snackbar.Snackbar;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class Register extends MainActivity {

    private FirebaseDatabase firebaseDatabase;
    private DatabaseReference databaseReference;
    private FirebaseAuth mAuth;
    private User user;

    ProgressBar progressBar;
    EditText mName, mEmail, mPassword, mConfirmPassword;

    Button btnregister;
    TextView txtalreadyamember;
    Snackbar snackbar;
    String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);

        progressBar = findViewById(R.id.progressBar);

        mName = findViewById(R.id.ettxtName);
        mEmail = findViewById(R.id.ettxtEmail);
        mPassword = findViewById(R.id.ettxtPassword);
        mConfirmPassword = findViewById(R.id.ettxtConfirmPassword);
        btnregister = findViewById(R.id.btnRegister);
        txtalreadyamember = findViewById(R.id.txtAlreadyAMember);

        mAuth = FirebaseAuth.getInstance();

        //initListeners();
        btnregister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = mName.getText().toString().trim();
                String email = mEmail.getText().toString().trim();
                String password = mPassword.getText().toString().trim();
                String confirmpassword = mConfirmPassword.getText().toString().trim();

                //check whether name is empty or not
                if(TextUtils.isEmpty(name)){
                    mName.setError("Name is required");
                    return;
                }

                //check whether email address is empty or not
                if(TextUtils.isEmpty(email)){
                    mEmail.setError("Email Address is required");
                    return;
                }

                //check email address pattern is correct or not
                //if (isEmailValid(email))

                if (!email.matches(emailPattern)){
                    mEmail.setError("Email Address is invalid");
                    return;
                }

                //check whether password is empty or not
                if(TextUtils.isEmpty(password)){
                    mPassword.setError(" Password is required");
                    return;
                }

                //check whether password is less than 6 characters?
                if(password.length() < 6){
                    mPassword.setError("Password must be >= 6 characters");
                    return;
                }

                //check whether password and confirm password are match or not
                if(!password.equals(confirmpassword)){
                    mConfirmPassword.setError("Password does not match");
                    return;
                }

                //Make progress bar visible
                progressBar.setVisibility(View.VISIBLE);

                //User Method call
                user = new User (name, email, password);

                //create user by calling registerUser function
                registerUser(email, password);

                //Call function to empty All EditText
                emptyInputEditText();
            }
        });
    }

    private void registerUser(String email, String password) {
        //Register the user in firebase
        mAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()){

                    FirebaseUser user = mAuth.getCurrentUser();
                    updateUI(user);

                    //display snackbar with green background
                    View view = findViewById(android.R.id.content);
                    String message = "Account Created Successfully";
                    int duration = Snackbar.LENGTH_LONG;

                    snackbar = Snackbar.make(view, message, duration)
                            .setAction("Action", null);
                    View sbView = snackbar.getView();
                    sbView.setBackgroundColor(Color.GREEN);
                    snackbar.show();

                    //Toast.makeText(Register.this,"Account Created",Toast.LENGTH_SHORT).show();
                    startActivity(new Intent(getApplicationContext(), Home.class));

                }
                else{
                    //display snackbar with red background
                    View view = findViewById(android.R.id.content);
                    String message = "Email ID already exits";
                    int duration = Snackbar.LENGTH_LONG;

                    snackbar = Snackbar.make(view, message, duration)
                            .setAction("Action", null);
                    View sbView = snackbar.getView();
                    sbView.setBackgroundColor(Color.RED);
                    snackbar.show();

                    //Toast.makeText(Register.this,"Error Occured" + task.getException(),Toast.LENGTH_SHORT).show();*/
                   // updateUI(null);
                    progressBar.setVisibility(View.INVISIBLE);
                }
            }
        });
    }


    /**
     * This method is to empty all input edit text
     */
    private void emptyInputEditText() {
        mName.setText(null);
        mEmail.setText(null);
        mPassword.setText(null);
        mConfirmPassword.setText(null);
    }

    public void onStart(){
        super.onStart();
        //check if user is signed in and update UI accordingly
        FirebaseUser currentUser = mAuth.getCurrentUser();
        updateUI(currentUser);
    }


    private void updateUI(FirebaseUser currentUser) {
        if (user != null) {
            firebaseDatabase = FirebaseDatabase.getInstance();
            databaseReference = firebaseDatabase.getReference();//databasereference

            String uid = currentUser.getUid();
            DatabaseReference userRef = databaseReference.child("users");//Create child node reference
            userRef.child(uid).setValue(user);//Insert value to child node
        }
    }

    public void enabled(View view) {
        Intent intent = new Intent(Register.this, MainActivity.class);
        startActivity(intent);
        finish();
    }
}

That's it. Run your program and see the result.

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How to add user registration data into the Firebase database?

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