Answer: The primary constructor is part of the class header. Unlike Java, you don't need to declare a constructor in the body of the class. Here's an example:
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/** | |
* An [Observer] for [Event]s, simplifying the pattern of checking if the [Event]'s content has | |
* already been handled. | |
* | |
* [onEventUnhandledContent] is *only* called if the [Event]'s contents has not been handled. | |
*/ | |
class EventObserver<T>(private val onEventUnhandledContent: (T) -> Unit) : Observer<Event<T>> { | |
override fun onChanged(event: Event<T>?) { | |
event?.getContentIfNotHandled()?.let { value -> | |
onEventUnhandledContent(value) |
Answer: As a user navigates through, out of, and back to your app, the Activity instances in your app transition through different states in their lifecycle.
To navigate transitions between stages of the activity lifecycle, the Activity class provides a core set of six callbacks: onCreate()
, onStart()
, onResume()
, onPause()
, onStop()
, and onDestroy()
. The system invokes each of these callbacks as an activity enters a new state.
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//settings.gradle.kts | |
dependencyResolutionManagement { | |
repositories { | |
maven { url = uri("https://androidx.dev/snapshots/builds/11670047/artifacts/repository/") } | |
google() | |
mavenCentral() | |
maven(url = "https://plugins.gradle.org/m2/") | |
maven(url = "https://maven.pkg.jetbrains.space/public/p/compose/dev") | |
} |