Firebase project setup in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize Firebase in your Android app's main activity.

Android Kotlin

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  setContentView(R.layout.activity_main)
  Firebase[1].initializeApp(this)
}

Drag options to blanks, or click blank then click option'

AApp

BAuth

CDatabase

DFirestore

Attempts:

3 left

💡 Hint

Common Mistakes

Using FirebaseAuth or FirebaseDatabase instead of FirebaseApp.

Forgetting to call initialize in onCreate.

You need to call FirebaseApp.initializeApp(this) to initialize Firebase in your app.

2fill in blank

medium

Complete the code to add Firebase Analytics to your app.

Android Kotlin

val analytics = FirebaseAnalytics[1](this)

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A.setup

B.initialize

C.getInstance

D.create

Attempts:

3 left

💡 Hint

Common Mistakes

Using initialize or create instead of getInstance.

Not passing the context 'this' as parameter.

Use FirebaseAnalytics.getInstance(this) to get the Analytics instance.

3fill in blank

hard

Fix the error in the Firebase Realtime Database reference code.

Android Kotlin

val database = FirebaseDatabase.getInstance()
val myRef = database.[1]("message")

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AgetRef

BgetReference

Cref

Dreference

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'reference' or 'ref' which are not methods.

Using 'getRef' which does not exist.

The correct method to get a database reference is getReference("message").

4fill in blank

hard

Fill both blanks to complete the Firebase Cloud Firestore initialization and get a collection reference.

Android Kotlin

val db = FirebaseFirestore[1]()
val usersRef = db.[2]("users")

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AgetInstance

Bcollection

CgetCollection

Dinitialize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'initialize' instead of 'getInstance'.

Using 'getCollection' which is not a Firestore method.

Use FirebaseFirestore.getInstance() to get Firestore instance and collection("users") to get the collection reference.

5fill in blank

hard

Fill all three blanks to complete the Firebase Authentication sign-in with email and password code.

Android Kotlin

val auth = FirebaseAuth[1]()
auth.[2]WithEmailAndPassword(email, password)
  .addOnCompleteListener(this) { task ->
    if (task.[3]()) {
      // Sign in success
    } else {
      // Sign in failed
    }
  }

Drag options to blanks, or click blank then click option'

AgetInstance

Binstance

CisSuccessful

DsignIn

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'signIn' instead of 'getInstance' for first blank.

Using 'instance' instead of 'signIn' for second blank.

Checking 'task.success' instead of 'task.isSuccessful()'.

Use FirebaseAuth.getInstance() to get the auth instance, then signInWithEmailAndPassword to sign in, and check task.isSuccessful() to know if sign-in succeeded.