Headsup Notification Not Displayed On Kitkat

I have a notification, presented using the following code: // Create the notification android.app.Notification systemNotification = new NotificationCompat.Builder(context)

Solution 1:

On Kitkat, the notification only appears in the status bar, there's no popup notification

That is because the heads-up notification behavior was added in Android 5.0 and did not exist in prior versions of Android.

Solution 2:

Ensure that you have popup notifications enabled on your KitKat device.