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How to Update/Change Email from Firebase in Android?

  • Difficulty Level : Hard
  • Last Updated : 19 May, 2021

In any app, we got a feature to login using our email and password. Sometimes it happens that we want to change our email or we lost the password of our previous email so here we are going to implement the same feature to change our email using Firebase Authentication. Note that we are going to implement this project using the Java language. 

Step by Step Implementation

Lets’ consider you have already an existing project or you may create a new project. 

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Step 1: Create a new Project

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.  



Step 2: Working with the XML file

Go to the XML file and refer to the following code. Below is the code for the XML file.

XML




<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".ChangeEmail">
   
    <EditText
        android:id="@+id/email"
        android:layout_width="267dp"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="36dp"
        android:layout_marginTop="120dp"
        android:ems="10"
        android:hint="Email"
        android:inputType="textEmailAddress" />
 
    <EditText
        android:id="@+id/logpass"
        android:layout_width="259dp"
        android:layout_height="58dp"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="32dp"
        android:layout_marginTop="161dp"
        android:ems="10"
        android:hint="Password"
        android:inputType="textPassword" />
 
    <EditText
        android:id="@+id/change"
        android:layout_width="259dp"
        android:layout_height="58dp"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="32dp"
        android:layout_marginTop="211dp"
        android:ems="10"
        android:hint="Change Email"
        android:inputType="textEmailAddress" />
 
    <Button
        android:id="@+id/changeemail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="192dp"
        android:layout_marginTop="277dp"
        android:background="@color/colorPrimary"
        android:text="Change Email Here"
        android:textSize="15dp" />
   
</RelativeLayout>

 

 

Step 3: Working with the Java file

 

So the main part exists on the java file. In this file, we need to re-authenticate the user as according to the documentation changing the primary email address is a sensitive action. Below is the code snippet for doing the same.



 

Java




FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
 
// Get auth credentials from the user for re-authentication
AuthCredential credential = EmailAuthProvider.getCredential(email, password); // Current Login Credentials
 
// Prompt the user to re-provide their sign-in credentials
user.reauthenticate(credential).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                       
                        Log.d("value", "User re-authenticated.");
 
                        // Now change your email address \\
                        //----------------Code for Changing Email Address----------\\
                        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
                        user.updateEmail(change.getText().toString()).addOnCompleteListener(new OnCompleteListener<Void>() {
                                    @Override
                                    public void onComplete(@NonNull Task<Void> task) {
                                        if (task.isSuccessful()) {
                                            Toast.makeText(ChangeEmail.this, "Email Changed" + " Current Email is " + change.getText().toString(), Toast.LENGTH_LONG).show();
                                        }
                             }
                 });
       }
});

 

 

Below is the complete code for the Java file for the above XML file.

 

Java




import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
 
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.EmailAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
 
public class ChangeEmail extends AppCompatActivity {
 
    FirebaseAuth auth;
    Button changeemail;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_change_email);
 
        // Initialising the email and password
        final EditText email = findViewById(R.id.email);
        final EditText password = findViewById(R.id.logpass);
        changeemail = findViewById(R.id.changeemail);
 
        // click on this to change email
        changeemail.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                changeemail(email.getText().toString(), password.getText().toString());
            }
        });
 
    }
 
    EditText change;
 
    // Here we are going to change our email using firebase re-authentication
    private void changeemail(String email, final String password) {
 
        change = findViewById(R.id.change);
 
        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
 
        // Get auth credentials from the user for re-authentication
        AuthCredential credential = EmailAuthProvider.getCredential(email, password); // Current Login Credentials
 
        // Prompt the user to re-provide their sign-in credentials
        user.reauthenticate(credential).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
 
                        Log.d("value", "User re-authenticated.");
 
                        // Now change your email address \\
                        //----------------Code for Changing Email Address----------\\
                        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
                        user.updateEmail(change.getText().toString()).addOnCompleteListener(new OnCompleteListener<Void>() {
                                    @Override
                                    public void onComplete(@NonNull Task<Void> task) {
                                        if (task.isSuccessful()) {
                                            Toast.makeText(ChangeEmail.this, "Email Changed" + " Current Email is " + change.getText().toString(), Toast.LENGTH_LONG).show();
                                        }
                                    }
                                });
                         }
             });
    }
}

 

 

Output:

 

 




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