Permission request flow in Android Kotlin - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ ui_behavior

intermediate

What happens when permission is denied permanently?

In Android, if a user denies a permission and selects "Don't ask again", what is the expected behavior when the app requests the same permission again?

A The system shows the permission dialog again to the user.

B The app crashes because permission is denied permanently.

C The app receives a callback indicating permission denied without showing the dialog.

D The app automatically gets the permission without user interaction.

💡 Hint

Think about how Android handles permissions after the user disables future prompts.

When a user denies permission and selects "Don't ask again", the system no longer shows the permission dialog. Instead, the app immediately receives a denial callback.

❓ lifecycle

intermediate

When to request permissions in Activity lifecycle?

Which lifecycle method is the best place to request runtime permissions in an Android Activity to ensure the UI is ready and the user is not interrupted during startup?

A onPause()

B onStart()

C onCreate()

D onResume()

💡 Hint

Consider when the Activity is fully visible and interactive.

Requesting permissions in onResume() ensures the UI is visible and ready, and the user can respond to the permission dialog without interruption.

📝 Syntax

advanced

What is the correct Kotlin code to request a single permission?

Given the following code snippet, which option correctly requests the CAMERA permission using Activity Result API in Kotlin?

Android Kotlin

val requestPermissionLauncher = registerForActivityResult(ActivityResultContracts.RequestPermission()) { isGranted ->
    if (isGranted) {
        // Permission granted
    } else {
        // Permission denied
    }
}

// Request permission here

A requestPermissionLauncher.launch("android.permission.CAMERA")

B requestPermissionLauncher.launch(Manifest.permission.CAMERA)

C requestPermissionLauncher.launch(Permission.CAMERA)

D requestPermissionLauncher.launch(Manifest.permission.CAMERA.toString())

💡 Hint

Use the constant from Manifest.permission for permissions.

The correct way is to pass Manifest.permission.CAMERA directly as a string constant to launch().

🔧 Debug

advanced

Why does the permission callback not trigger?

An app uses registerForActivityResult to request location permission but the callback never executes. What is the most likely cause?

Android Kotlin

val requestPermissionLauncher = registerForActivityResult(ActivityResultContracts.RequestPermission()) { isGranted ->
    // callback code
}

fun requestLocationPermission() {
    requestPermissionLauncher.launch(Manifest.permission.ACCESS_FINE_LOCATION)
}

// Called in onCreate
requestLocationPermission()

A requestPermissionLauncher must be a class-level variable, not local.

B The callback only triggers if permission is already granted.

C registerForActivityResult must be called before onCreate.

D The permission string ACCESS_FINE_LOCATION is incorrect.

💡 Hint

Consider the lifecycle of the launcher variable.

If the launcher is declared inside a function or local scope, it may be garbage collected before the callback triggers. It must be a class-level property.

🧠 Conceptual

expert

How to handle multiple permissions with rationale?

You want to request CAMERA and LOCATION permissions together. If the user denies any permission, you want to show a rationale dialog before requesting again. Which approach correctly implements this flow?

A Request both permissions at once using ActivityResultContracts.RequestMultiplePermissions(), then check which are denied and show rationale dialog before re-requesting only denied ones.

B Request CAMERA permission first, then LOCATION separately without rationale dialogs.

C Request permissions in manifest only, no runtime requests needed.

D Request permissions one by one without checking rationale, assuming user will grant eventually.

💡 Hint

Think about user experience and Android guidelines for multiple permissions.

RequestMultiplePermissions allows requesting several permissions at once. After the result, you can detect which were denied and show rationale dialogs before re-requesting only those permissions.