Saving instance state in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to save a string value in the instance state bundle.

Android Kotlin

override fun onSaveInstanceState(outState: Bundle) {
  super.onSaveInstanceState(outState)
  outState.putString("KEY_NAME", [1])
}

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

AgetName()

Bname

Cthis.name

DsavedName

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method call instead of the variable.

Using a variable name that does not exist.

You save the variable name into the bundle with putString.

2fill in blank

medium

Complete the code to restore the saved string value from the instance state bundle.

Android Kotlin

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  if (savedInstanceState != null) {
    name = savedInstanceState.[1]("KEY_NAME") ?: ""
  }
}

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AgetString

BgetCharSequence

CgetInt

DgetSerializable

Attempts:

3 left

💡 Hint

Common Mistakes

Using getInt which returns an integer, not a string.

Using getSerializable which is for objects, not strings.

Use getString to retrieve the saved string from the bundle.

3fill in blank

hard

Fix the error in saving an integer counter in the instance state bundle.

Android Kotlin

override fun onSaveInstanceState(outState: Bundle) {
  super.onSaveInstanceState(outState)
  outState.[1]("COUNTER", counter)
}

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AputString

BputBoolean

CputSerializable

DputInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using putString for an integer value causes a type error.

Using putSerializable unnecessarily complicates saving simple types.

Use putInt to save an integer value in the bundle.

4fill in blank

hard

Fill both blanks to restore an integer counter and provide a default value if missing.

Android Kotlin

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  counter = savedInstanceState?.[1]("COUNTER") ?: [2]
}

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AgetInt

B0

C1

DgetString

Attempts:

3 left

💡 Hint

Common Mistakes

Using getString to get an integer causes errors.

Using a default value other than zero without reason.

Use getInt to get the integer and 0 as the default value if none is saved.

5fill in blank

hard

Fill all three blanks to save and restore a boolean flag in the instance state.

Android Kotlin

override fun onSaveInstanceState(outState: Bundle) {
  super.onSaveInstanceState(outState)
  outState.[1]("FLAG", flag)
}

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  flag = savedInstanceState?.[2]("FLAG") ?: [3]
}

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AputBoolean

BgetBoolean

Cfalse

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using putInt or putString for boolean values.

Using true as default without reason.

Use putBoolean to save, getBoolean to restore, and false as the default flag value.