Lifecycle awareness in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to override the onCreate method in an Android Activity.

Android Kotlin

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

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

AonCreate

BonStart

ConResume

DonPause

Attempts:

3 left

💡 Hint

Common Mistakes

Using onStart or onResume instead of onCreate.

Forgetting to call super.onCreate.

The onCreate method is called when the activity is first created. Overriding it allows you to set up the UI and initialize components.

2fill in blank

medium

Complete the code to log a message when the activity is visible to the user.

Android Kotlin

override fun [1]() {
    super.onStart()
    Log.d("Lifecycle", "Activity is visible")
}

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AonStart

BonPause

ConStop

DonDestroy

Attempts:

3 left

💡 Hint

Common Mistakes

Using onResume instead of onStart.

Logging in onCreate instead of onStart.

The onStart method is called when the activity becomes visible to the user.

3fill in blank

hard

Fix the error in the lifecycle method that pauses the activity.

Android Kotlin

override fun [1]() {
    super.onPause()
    // Pause ongoing tasks here
}

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AonDestroy

BonStop

ConPause

DonResume

Attempts:

3 left

💡 Hint

Common Mistakes

Using onStop instead of onPause.

Not calling super.onPause.

The onPause method is called when the activity is partially obscured or about to go into the background. It is the right place to pause tasks.

4fill in blank

hard

Fill both blanks to correctly save and restore instance state in an activity.

Android Kotlin

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

override fun onRestoreInstanceState(savedInstanceState: Bundle) {
    super.onRestoreInstanceState(savedInstanceState)
    score = savedInstanceState.[2]("score")
}

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AputInt

BgetInt

CputString

DgetString

Attempts:

3 left

💡 Hint

Common Mistakes

Using putString/getString for integer values.

Forgetting to call super methods.

Use putInt to save an integer value and getInt to retrieve it from the bundle.

5fill in blank

hard

Fill all three blanks to implement a lifecycle observer that logs when the activity is resumed and paused.

Android Kotlin

class MyObserver : DefaultLifecycleObserver {
    override fun [1](owner: LifecycleOwner) {
        Log.d("Observer", "Activity resumed")
    }

    override fun [2](owner: LifecycleOwner) {
        Log.d("Observer", "Activity paused")
    }

    fun attach(lifecycle: Lifecycle) {
        lifecycle.[3](this)
    }
}

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AonResume

BonPause

CaddObserver

DremoveObserver

Attempts:

3 left

💡 Hint

Common Mistakes

Using removeObserver instead of addObserver.

Overriding wrong lifecycle methods.

The observer overrides onResume and onPause to log messages. It attaches itself to the lifecycle using addObserver.