Firebase Authentication in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize Firebase Authentication in an Android Kotlin app.

Android Kotlin

private lateinit var auth: FirebaseAuth

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  auth = FirebaseAuth.[1]()
}

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Astart

BgetInstance

Ccreate

Dinitialize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'initialize' instead of 'getInstance' causes errors.

Trying to create a new FirebaseAuth object directly.

You use FirebaseAuth.getInstance() to get the Firebase Authentication object.

2fill in blank

medium

Complete the code to sign in a user with email and password using Firebase Authentication.

Android Kotlin

auth.signInWithEmailAndPassword(email, password)
  .addOnCompleteListener { task ->
    if (task.[1]()) {
      // Sign in success
    } else {
      // Sign in failed
    }
  }

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AisDone

BisComplete

CisSuccessful

DisSuccess

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'isComplete' which only means the task finished, not success.

Using 'isDone' or 'isSuccess' which do not exist.

The isSuccessful() method checks if the sign-in task succeeded.

3fill in blank

hard

Fix the error in the code to send a password reset email using Firebase Authentication.

Android Kotlin

auth.[1](userEmail)
  .addOnCompleteListener { task ->
    if (task.isSuccessful) {
      // Email sent
    }
  }

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AsendPasswordResetEmail

BresetPasswordEmail

CpasswordResetSend

DsendResetEmail

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names causes compile errors.

Trying to call a method that does not exist.

The correct method to send a password reset email is sendPasswordResetEmail().

4fill in blank

hard

Fill both blanks to create a new user with email and password and handle success or failure.

Android Kotlin

auth.[1](email, password)
  .addOnCompleteListener { task ->
    if (task.[2]()) {
      // User created
    } else {
      // Creation failed
    }
  }

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AcreateUserWithEmailAndPassword

BsignInWithEmailAndPassword

CisSuccessful

DisComplete

Attempts:

3 left

💡 Hint

Common Mistakes

Using signIn method instead of createUser method.

Checking 'isComplete' instead of 'isSuccessful'.

Use createUserWithEmailAndPassword to create a user and check isSuccessful() to confirm success.

5fill in blank

hard

Fill all three blanks to get the current user, check if signed in, and get their email.

Android Kotlin

val user = auth.[1]
if (user != null) {
  val email = user.[2]
  println("User email: [3]")
}

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AcurrentUser

Bemail

C$email

DgetCurrentUser

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method instead of property for current user.

Trying to call a method to get email instead of property.

You get the current user with currentUser, access their email property, and print it.