Why runtime permissions protect user privacy in Android Kotlin - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to request a runtime permission for accessing the camera.

Android Kotlin

ActivityCompat.requestPermissions(this, arrayOf([1]), 100)

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AManifest.permission.CAMERA

BManifest.permission.ACCESS_FINE_LOCATION

CManifest.permission.READ_CONTACTS

DManifest.permission.RECORD_AUDIO

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a permission unrelated to the camera like location or contacts.

Forgetting to use the full permission string.

The Manifest.permission.CAMERA is the correct permission to request camera access at runtime.

2fill in blank

medium

Complete the code to check if the app already has permission to read contacts.

Android Kotlin

if (ContextCompat.checkSelfPermission(this, [1]) == PackageManager.PERMISSION_GRANTED) {
    // Permission granted
}

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AManifest.permission.READ_CONTACTS

BManifest.permission.ACCESS_FINE_LOCATION

CManifest.permission.CAMERA

DManifest.permission.RECORD_AUDIO

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for a different permission than intended.

Using incorrect permission string format.

To check if the app has permission to read contacts, use Manifest.permission.READ_CONTACTS.

3fill in blank

hard

Fix the error in the code to handle the user's response to a permission request.

Android Kotlin

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, [1]: IntArray) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    if (requestCode == 100 && grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
        // Permission granted
    }
}

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ApermissionResults

Bresults

CgrantResults

DpermissionsResults

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong parameter name causes a compilation error.

Not matching the method signature exactly.

The parameter name must be grantResults to match the method signature and be used correctly inside the method.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps permissions to their grant status.

Android Kotlin

val permissionStatus = permissions.associateWith { [1][permissions.indexOf(it)] == [2] }

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AgrantResults

BPackageManager.PERMISSION_GRANTED

CPackageManager.PERMISSION_DENIED

DrequestCode

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong constant for permission status.

Confusing the array holding results with other variables.

This code maps each permission to whether it was granted by comparing grantResults to PackageManager.PERMISSION_GRANTED.

5fill in blank

hard

Fill all three blanks to request multiple permissions and handle the result.

Android Kotlin

ActivityCompat.requestPermissions(this, arrayOf([1], [2]), [3])

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
    if (requestCode == [3]) {
        for (i in permissions.indices) {
            if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                // Permission [1] or [2] granted
            }
        }
    }
}

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AManifest.permission.CAMERA

BManifest.permission.ACCESS_FINE_LOCATION

C101

D102

Attempts:

3 left

💡 Hint

Common Mistakes

Using mismatched request codes in request and result handling.

Requesting permissions not declared in the manifest.

This code requests camera and location permissions with request code 101 and checks the results accordingly.