SavedStateHandle in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to retrieve a value from SavedStateHandle.

Android Kotlin

val name: String? = savedStateHandle.get<String>([1])

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

A"userName"

BuserName

C"user_name"

Duser_name

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the key string.

Using a variable name without quotes.

The key for SavedStateHandle must be a string literal, so it needs quotes.

2fill in blank

medium

Complete the code to save a value into SavedStateHandle.

Android Kotlin

savedStateHandle.set([1], "John")

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

Auser_name

BuserName

C"user_name"

D"userName"

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted keys when calling set().

Confusing variable names with string keys.

The key must be a string literal with quotes when saving a value.

3fill in blank

hard

Fix the error in the code to observe a LiveData from SavedStateHandle.

Android Kotlin

val liveData = savedStateHandle.getLiveData<String>([1])

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

Auser_name

B"userName"

CuserName

D"user_name"

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted keys causing compile errors.

Mixing variable names with string keys.

The key must be a string literal with quotes to correctly observe LiveData.

4fill in blank

hard

Fill both blanks to create a SavedStateHandle with initial values.

Android Kotlin

val initialState = mapOf([1] to "Alice", [2] to 25)
initialState.forEach { (k, v) -> savedStateHandle.set(k, v) }

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

A"name"

B"age"

Cname

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted keys in the map.

Using variable names instead of string keys.

Keys in maps and SavedStateHandle must be string literals with quotes.

5fill in blank

hard

Fill all three blanks to update and retrieve a value safely from SavedStateHandle.

Android Kotlin

savedStateHandle.set([1], 100)
val score: Int = savedStateHandle.get<Int>([2]) ?: [3]

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

A"score"

C0

D100

Attempts:

3 left

💡 Hint

Common Mistakes

Using different keys for set and get.

Not providing a default value causing null errors.

Using unquoted keys.

Use the same quoted key for set and get, and provide a default value if null.