Firebase User Authentication In Android

Introduction

In part one of this series, we learned about features of Firebase authentication, how to start/enable email authentication and how to sign-in and sign-up with email and password in Firebase. New to email and password authentication? First, read part one of this article. In this part, we will learn the following features:

Forgot Password
Change Username/Email
Change Password
Delete Account
Checking User Session
Clear/Sign-out the Session

FORGOT PASSWORD

Firebase provides the sendPasswordResetEmail() method to reset password. It automatically sends the Reset Password email to your entered email. To reset a password, click the link in your email.

Note

We can customize the Email Template in Email Templates Tab in Authentication Option.

// Method to Reset Password or Forget Password Option
auth.sendPasswordResetEmail(modeStr).addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()) {
Toast.makeText(ForgetAndChangePasswordActivity.this, "We have sent you instructions to reset your password!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(ForgetAndChangePasswordActivity.this, "Failed to send reset email!", Toast.LENGTH_SHORT).show();
}
PD.dismiss();
}
});

CHANGE USERNAME OR PASSWORD

Firebase provides updatePassword() to change the password and updateEmail() to change your Email ID.

// Method to change Password Option
user.updatePassword(modeStr)
.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()) {
Toast.makeText(ForgetAndChangePasswordActivity.this, "Password is updated!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(ForgetAndChangePasswordActivity.this, "Failed to update password!", Toast.LENGTH_SHORT).show();
}
PD.dismiss();
}
});
// Method to Change Email or Username Option
user.updateEmail(modeStr)
.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()) {
Toast.makeText(ForgetAndChangePasswordActivity.this, "Email address is updated.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(ForgetAndChangePasswordActivity.this, "Failed to update email!", Toast.LENGTH_LONG).show();
}
PD.dismiss();
}
});

DELETE USER ACCOUNT

Firebase provides delete() method to delete an account.

// Method to Remove Account Option
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null) {
user.delete()
.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()) {
Toast.makeText(ForgetAndChangePasswordActivity.this, "Your profile is deleted:", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(ForgetAndChangePasswordActivity.this, "Failed to delete your account!", Toast.LENGTH_SHORT).show();
}
PD.dismiss();
}
});
}

CHECKING USER SESSION

We can check if the user is logged in or not with Firebase using the following method.

//Checking user is present or not
FirebaseAuth auth = FirebaseAuth.getInstance();
if (auth.getCurrentUser() != null) {
Log.v("Session", "Signed In");
}

SIGN OUT USER SESSION

Firebase provides signOut() method to Sign out/Clear Firebase User Session.

// Sign-Out option
btnSignOut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
auth.signOut();
// this listener will be called when there is change in firebase user session
FirebaseAuth.AuthStateListener authListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user == null) {
startActivity(new Intent(MainActivity.this, LoginActivity.class));
finish();
}
}
};
}
});

From Part 1 & 2 of the article, we have learned how to do Firebase Email & Password Authentication with its awesome features.

Download Code

In this, I explained each method to handle the Firebase Email/Password method and am not explaining the layout of each screen in this project. For more details, please download the whole project source from GitHub.

If you feel this article is informative, do like and star the repo on GitHub. You can download the full sample code here.