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kotlinlang

What the idiomatic way of doing this in Kotlin?
``` if (mNotificationManager == null) {
                mNotificationManager = this.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
 }```

```val notificationManager by lazy {
    context.getSystemService&lt;NotificationManager&gt;()
}```
<https://developer.android.com/reference/kotlin/androidx/core/content/package-summary#getsystemservice|androidx.core.content.getSystemService> avoids a cast, <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/lazy.html|kotlin.lazy> handles init-once