Activity results in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start an activity for result using the new Activity Result API.

Android Kotlin

val getContent = registerForActivityResult([1]) { uri ->
    // Handle the returned Uri
}

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

AActivityResultContracts.StartActivityForResult()

BActivityResultContracts.GetContent()

CActivityResultContracts.TakePicture()

DActivityResultContracts.RequestPermission()

Attempts:

3 left

💡 Hint

Common Mistakes

Using StartActivityForResult() which returns an ActivityResult, not a Uri.

Using RequestPermission() which is for permissions, not content.

The GetContent() contract lets you pick content and get a Uri result.

2fill in blank

medium

Complete the code to launch the activity to pick an image.

Android Kotlin

getContent.launch([1])

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

A"application/pdf"

B"text/plain"

C"video/*"

D"image/*"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'text/plain' which is for text files.

Using 'video/*' which is for videos.

To pick an image, the MIME type should be "image/*".

3fill in blank

hard

Fix the error in the callback parameter type for the activity result launcher.

Android Kotlin

val getContent = registerForActivityResult(ActivityResultContracts.GetContent()) { [1] ->
    // Use the Uri
}

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

Auri

Bintent

Cresult

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'intent' or 'data' which are used in the old API.

Using 'result' which is ambiguous.

The callback receives a Uri? named here as uri.

4fill in blank

hard

Fill both blanks to correctly handle the result in the old onActivityResult method.

Android Kotlin

override fun onActivityResult(requestCode: Int, resultCode: Int, [1]: Intent?) {
    super.onActivityResult(requestCode, resultCode, [2])
    if (requestCode == PICK_IMAGE && resultCode == RESULT_OK) {
        val uri = data?.data
        // Use the uri
    }
}

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

Adata

Bintent

Cresult

Dresponse

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in parameter and super call.

Using 'intent' or 'result' which are not consistent here.

The parameter and the super call both use data as the Intent variable.

5fill in blank

hard

Fill all three blanks to create a map of request codes to their string descriptions.

Android Kotlin

val requestDescriptions = mapOf(
    PICK_IMAGE to [1],
    PICK_VIDEO to [2],
    PICK_AUDIO to [3]
)

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

A"Pick Image"

B"Pick Video"

C"Pick Audio"

D"Pick Document"

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up descriptions or using unrelated strings.

Using 'Pick Document' which is not in the request codes.

This map links each request code to a descriptive string for clarity.