Notification channels in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a notification channel with the given ID.

Android Kotlin

val channel = NotificationChannel("[1]", "Channel Name", NotificationManager.IMPORTANCE_DEFAULT)

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

Anotification_id

Bchannel_id_01

Cdefault_channel

Dmy_channel

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name instead of a string literal.

Leaving the channel ID blank.

The channel ID must be a unique string to identify the notification channel. Here, "channel_id_01" is used as the ID.

2fill in blank

medium

Complete the code to get the NotificationManager system service.

Android Kotlin

val notificationManager = context.getSystemService([1]) as NotificationManager

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

Anotification_service

BNotificationManager

CNOTIFICATION_MANAGER_SERVICE

DNOTIFICATION_SERVICE

Attempts:

3 left

💡 Hint

Common Mistakes

Using the class name instead of the service constant.

Using incorrect capitalization.

The constant NOTIFICATION_SERVICE is used to get the notification service from the context.

3fill in blank

hard

Fix the error in the code to create a notification channel only on Android Oreo or higher.

Android Kotlin

if (Build.VERSION.SDK_INT >= [1]) {
    notificationManager.createNotificationChannel(channel)
}

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

ABuild.VERSION_CODES.O

BBuild.VERSION_CODES.M

CBuild.VERSION_CODES.P

DBuild.VERSION_CODES.N

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong API level constant.

Not checking the API level before creating the channel.

Notification channels were introduced in Android Oreo (API level 26), so the check must be against Build.VERSION_CODES.O.

4fill in blank

hard

Fill both blanks to build a notification with a small icon and a title.

Android Kotlin

val notification = Notification.Builder(context, "channel_id_01")
    .setSmallIcon([1])
    .setContentTitle([2])
    .build()

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

AR.drawable.ic_notification

B"New Message"

CR.layout.notification_layout

D"Notification Title"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a layout resource instead of a drawable for the icon.

Not using quotes around the title string.

The small icon must be a drawable resource ID, and the content title is a string shown in the notification header.

5fill in blank

hard

Fill all three blanks to send the notification with ID 1001.

Android Kotlin

val [3] = Notification.Builder(context, "channel_id_01")
    .setSmallIcon(R.drawable.ic_notification)
    .setContentTitle("Hello")
    .build()

notificationManager.[1](1001, [2])

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

Anotify

Bnotification

CsendNotification

DnotificationBuilder

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong method name like sendNotification.

Passing the wrong variable as the notification.

Using inconsistent variable names.

The notify() method sends the notification with an ID. The notification object must be passed as the second argument. The variable holding the notification is named 'notification'.