Firebase Analytics in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Android Kotlin

val firebaseAnalytics = FirebaseAnalytics.[1](this)

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

AgetInstance

Binitialize

Ccreate

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'initialize' instead of 'getInstance' causes a compile error.

Trying to call 'create' or 'start' methods which do not exist.

The getInstance method returns the FirebaseAnalytics instance for the given context.

2fill in blank

medium

Complete the code to log a custom event named "share_image" with Firebase Analytics.

Android Kotlin

val bundle = Bundle().apply {
  putString(FirebaseAnalytics.Param.METHOD, "[1]")
}
firebaseAnalytics.logEvent("share_image", bundle)

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

Abluetooth

Bsms

Csocial

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Using an invalid method name that is not a string.

Forgetting to put the parameter inside the bundle.

The putString method adds a parameter to the event bundle. Here, the method is set to "email" to indicate the sharing method.

3fill in blank

hard

Fix the error in the code to set the user ID for Firebase Analytics.

Android Kotlin

firebaseAnalytics.[1]("user_123")

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

AsetUserId

BsetUserID

CsetUser

DuserId

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setUserID' with uppercase 'ID' causes a method not found error.

Using 'setUser' or 'userId' which are not valid methods.

The correct method to set the user ID is setUserId with a lowercase 'd'.

4fill in blank

hard

Fill both blanks to create a bundle with a parameter for item ID and log an event named "select_content".

Android Kotlin

val bundle = Bundle().apply {
  putString(FirebaseAnalytics.Param.[1], "12345")
}
firebaseAnalytics.logEvent("[2]", bundle)

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

AITEM_ID

BCONTENT_TYPE

Cselect_content

Dview_item

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'CONTENT_TYPE' instead of 'ITEM_ID' for the parameter key.

Logging the wrong event name like 'view_item' instead of 'select_content'.

The parameter key for item ID is ITEM_ID. The event name to log is select_content.

5fill in blank

hard

Fill all three blanks to create a bundle with item name and content type, then log a "view_item" event.

Android Kotlin

val bundle = Bundle().apply {
  putString(FirebaseAnalytics.Param.[1], "Sunglasses")
  putString(FirebaseAnalytics.Param.[2], "[3]")
}
firebaseAnalytics.logEvent("view_item", bundle)

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

AITEM_NAME

BCONTENT_TYPE

Caccessories

DITEM_ID

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up parameter keys like using 'ITEM_ID' instead of 'ITEM_NAME'.

Using an incorrect content type value.

The parameter keys are ITEM_NAME and CONTENT_TYPE. The content type value is "accessories".

Practice

1. What is the main purpose of Firebase Analytics in an Android app?

easy

A. To manage app permissions

B. To store user passwords securely

C. To create user interface layouts

D. To track user actions and events within the app

Solution

1. Step 1: Understand Firebase Analytics role

   Firebase Analytics is designed to collect data about user interactions and events in the app.

2. Step 2: Compare options with purpose

   Only To track user actions and events within the app describes tracking user actions, which matches Firebase Analytics' main use.

3. Final Answer:

   To track user actions and events within the app -> Option D

4. Quick Check:

   Firebase Analytics tracks user actions = A [OK]

Hint: Firebase Analytics tracks events and user behavior [OK]

Common Mistakes:

• Confusing analytics with security or UI tasks
• Thinking it manages app permissions
• Assuming it stores sensitive data like passwords

2. Which is the correct Kotlin syntax to log a custom event named purchase with Firebase Analytics?

easy

A. firebaseAnalytics.logEvent("purchase", Bundle())

B. firebaseAnalytics.logEvent(purchase, null)

C. firebaseAnalytics.logEvent("purchase")

D. firebaseAnalytics.logEvent('purchase', null)

Solution

1. Step 1: Recall logEvent method signature

   logEvent requires event name as String and a Bundle for parameters (can be empty).

2. Step 2: Check options for correct syntax

   firebaseAnalytics.logEvent("purchase", Bundle()) uses a String event name and an empty Bundle(), which is valid Kotlin syntax.

3. Final Answer:

   firebaseAnalytics.logEvent("purchase", Bundle()) -> Option A

4. Quick Check:

   logEvent needs event name string and Bundle = D [OK]

Hint: Use event name as string and Bundle() for parameters [OK]

Common Mistakes:

• Omitting quotes around event name
• Passing null instead of Bundle()
• Calling logEvent with only one argument

3. Given this Kotlin code snippet, what will be logged as the event name?

val bundle = Bundle()
bundle.putString("item", "book")
firebaseAnalytics.logEvent("select_content", bundle)

medium

A. "item"

B. "select_content"

C. "book"

D. No event will be logged

Solution

1. Step 1: Identify event name argument

   The first argument to logEvent is the event name string "select_content".

2. Step 2: Understand bundle role

   The bundle contains parameters, here "item" with value "book", but event name is separate.

3. Final Answer:

   "select_content" -> Option B

4. Quick Check:

   Event name is first argument = C [OK]

Hint: Event name is first string argument in logEvent [OK]

Common Mistakes:

• Confusing parameter keys with event name
• Thinking bundle keys become event names
• Assuming no event logs without explicit call

4. What is wrong with this Kotlin code for logging an event?

val bundle = Bundle()
bundle.putString("level", "5")
firebaseAnalytics.logEvent(level, bundle)

medium

A. The variable 'level' is not defined as a String event name

B. Bundle cannot contain strings

C. logEvent requires only one argument

D. Bundle should be null instead of a Bundle object

Solution

1. Step 1: Check event name argument

   logEvent expects a String event name, but 'level' is used as a variable, which is undefined here.

2. Step 2: Validate bundle usage

   Bundle usage is correct; it can contain strings and is passed properly.

3. Final Answer:

   The variable 'level' is not defined as a String event name -> Option A

4. Quick Check:

   Event name must be a string literal or defined string = B [OK]

Hint: Event name must be a string, not an undefined variable [OK]

Common Mistakes:

• Passing undefined variables as event names
• Misunderstanding Bundle contents
• Using wrong number of arguments in logEvent

5. You want to log a purchase event with item name and price using Firebase Analytics in Kotlin. Which code correctly logs this event with parameters?

hard

A. val bundle = Bundle()
bundle.putString("item_name", "shoes")
bundle.putDouble("price", "59.99")
firebaseAnalytics.logEvent("purchase", bundle)

B. val bundle = Bundle()
bundle.putString("item_name", "shoes")
bundle.putFloat("price", "59.99f")
firebaseAnalytics.logEvent("purchase", bundle)

C. val bundle = Bundle()
bundle.putString("item_name", "shoes")
bundle.putString("price", "59.99")
firebaseAnalytics.logEvent("purchase", bundle)

D. val bundle = Bundle()
bundle.putInt("item_name", 59)
bundle.putDouble("price", 59.99)
firebaseAnalytics.logEvent("purchase", bundle)

Solution

1. Step 1: Check parameter types for Firebase Analytics

   Firebase Analytics Bundle supports putString for strings; price should be string or long, not double or float.

2. Step 2: Analyze options for correct types

   val bundle = Bundle() bundle.putString("item_name", "shoes") bundle.putString("price", "59.99") firebaseAnalytics.logEvent("purchase", bundle) uses putString for both item_name and price, which is safe and accepted for Firebase Analytics parameters.

3. Final Answer:

   val bundle = Bundle() bundle.putString("item_name", "shoes") bundle.putString("price", "59.99") firebaseAnalytics.logEvent("purchase", bundle) -> Option C

4. Quick Check:

   Use putString for parameters to avoid type issues = A [OK]

Hint: Use putString for all parameters to ensure compatibility [OK]

Common Mistakes:

• Using putDouble or putFloat which may cause errors
• Putting numbers in wrong parameter keys
• Using putInt for string values