Permission request flow in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the app has the CAMERA permission.

Android Kotlin

val hasCameraPermission = ContextCompat.checkSelfPermission(this, [1]) == PackageManager.PERMISSION_GRANTED

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

AManifest.permission.CAMERA

BManifest.permission.ACCESS_FINE_LOCATION

CManifest.permission.RECORD_AUDIO

DManifest.permission.READ_CONTACTS

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong permission string like location or contacts.

Forgetting to compare the result to PERMISSION_GRANTED.

We check for the CAMERA permission using Manifest.permission.CAMERA.

2fill in blank

medium

Complete the code to request CAMERA permission from the user.

Android Kotlin

ActivityCompat.requestPermissions(this, arrayOf([1]), REQUEST_CAMERA_CODE)

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AManifest.permission.CAMERA

BManifest.permission.ACCESS_FINE_LOCATION

CManifest.permission.READ_SMS

DManifest.permission.RECORD_AUDIO

Attempts:

3 left

💡 Hint

Common Mistakes

Requesting a different permission than the one checked.

Not wrapping the permission string inside an array.

We request the CAMERA permission by passing Manifest.permission.CAMERA inside the array.

3fill in blank

hard

Fix the error in the permission result check inside onRequestPermissionsResult.

Android Kotlin

if (requestCode == REQUEST_CAMERA_CODE && grantResults.isNotEmpty() && grantResults[[1]] == PackageManager.PERMISSION_GRANTED) {
    // Permission granted
}

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A1

B-1

C0

DrequestCode

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 1 or other invalid indices causing crashes.

Comparing with requestCode instead of grantResults.

The first permission result is at index 0 in grantResults.

4fill in blank

hard

Fill both blanks to create a function that checks and requests CAMERA permission if not granted.

Android Kotlin

fun checkCameraPermission() {
    if (ContextCompat.checkSelfPermission(this, [1]) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, arrayOf([2]), REQUEST_CAMERA_CODE)
    }
}

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

AManifest.permission.CAMERA

BManifest.permission.ACCESS_FINE_LOCATION

DManifest.permission.READ_CONTACTS

Attempts:

3 left

💡 Hint

Common Mistakes

Using different permissions in check and request.

Forgetting to wrap the permission in an array when requesting.

Both blanks require Manifest.permission.CAMERA to check and request the camera permission.

5fill in blank

hard

Fill all three blanks to handle permission result and show a message if permission is denied.

Android Kotlin

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    if (requestCode == REQUEST_CAMERA_CODE) {
        if (grantResults.isNotEmpty() && grantResults[[1]] == PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, [2], Toast.LENGTH_SHORT).show()
        } else {
            Toast.makeText(this, [3], Toast.LENGTH_SHORT).show()
        }
    }
}

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

A0

B"Camera permission granted"

C"Camera permission denied"

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong index for grantResults.

Mixing up granted and denied messages.

Forgetting to call super method.

Index 0 checks the first permission result. Show a granted message if permission is allowed, else show denied message.