Why local storage enables offline access in Android Kotlin - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to save a string value in SharedPreferences.

Android Kotlin

val sharedPref = getSharedPreferences("MyPrefs", MODE_PRIVATE)
val editor = sharedPref.edit()
editor.putString("username", [1])
editor.apply()

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

Ausername

B"JohnDoe"

CgetString()

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the string value.

Using a variable name instead of a string literal.

We save the string "JohnDoe" as the value for the key "username" in SharedPreferences.

2fill in blank

medium

Complete the code to read a string value from SharedPreferences with a default fallback.

Android Kotlin

val sharedPref = getSharedPreferences("MyPrefs", MODE_PRIVATE)
val username = sharedPref.getString("username", [1])

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

A0

B""

C"Guest"

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using null without quotes.

Using a number instead of a string.

We provide "Guest" as the default value if "username" is not found in SharedPreferences.

3fill in blank

hard

Fix the error in the code to correctly save an integer in SharedPreferences.

Android Kotlin

val sharedPref = getSharedPreferences("MyPrefs", MODE_PRIVATE)
val editor = sharedPref.edit()
editor.[1]("userAge", 25)
editor.apply()

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

AputFloat

BputString

CputBoolean

DputInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using putString for integers.

Using putBoolean or putFloat incorrectly.

Use putInt to save an integer value in SharedPreferences.

4fill in blank

hard

Fill both blanks to check if a key exists and then remove it from SharedPreferences.

Android Kotlin

val sharedPref = getSharedPreferences("MyPrefs", MODE_PRIVATE)
if (sharedPref.[1]("userToken")) {
  val editor = sharedPref.edit()
  editor.[2]("userToken")
  editor.apply()
}

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

Acontains

Bremove

Cclear

DgetBoolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using getBoolean instead of contains.

Using clear which removes all keys.

Use contains to check if the key exists and remove to delete it.

5fill in blank

hard

Fill all three blanks to save a boolean flag and then read it with a default value.

Android Kotlin

val sharedPref = getSharedPreferences("MyPrefs", MODE_PRIVATE)
val editor = sharedPref.edit()
editor.[1]("isLoggedIn", true)
editor.apply()

val isLoggedIn = sharedPref.[2]("isLoggedIn", [3])

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

AputBoolean

BgetBoolean

Cfalse

DputString

Attempts:

3 left

💡 Hint

Common Mistakes

Using putString for booleans.

Using getString instead of getBoolean.

Using true as default instead of false.

Use putBoolean to save a boolean and getBoolean to read it with a default of false.