Kotlin lifecycle delegates

An light library to write android lifecycle aware fields. An comfortable way to avoid lateinit fields and lifecycle methods overriding in android components (fragments, activities).

    implementation 'com.link184:lifecycle-delegates:1.0.0'
Gradle

Lifecycle aware initializers:

    private val onCreateInitializedString by onCreate { "Hello from onCreate()" }

    private val onStartInitializedString by onStart { "Hello from onStart()" }

    // initOnlyOnce - when false the field will be re-initialized on each onStart() event
    private val onResumeInitializedString by onStart(initOnlyOnce = false) { "Hello from onResume()" }
Kotlin

Lifecycle lazy releasable:

Note: it behaves the same as in kotlin.lazy() which means that all callback params will NOT be called
until the field is not called.

    // pauseablePlayer will be initialized when the field will be called for first time, the same as kotlin.lazy()
    // onPause callback will be ignored in case pauseablePlayer would not have been used before
    private val pauseablePlayer by lazyPauseable({
        VideoPlayer.create(...)
    }, onPause = {
        it.pause()
    })

    private val pauseableResumablePlayer by lazyPauseableResumable({
        VideoPlayer.create(...).also { it.play() }
    }, onPause = {
        it.pause()
    }, onResume = {
        it.play()
    })

    private val resumeableField by lazyResumeable(...)
    private val startableField by lazyStartable(...)
    private val stoppableField by lazyStoppable(...)
    private val stoppableStartableField by lazyStoppableStartable(...)
    private val destroyableField by lazyDestroyable(...)
    private val creatableField by lazyCreatable(...)
    private val creatableDestroyableField by lazyCreatableDestroyable(...)
Kotlin

Lifecycle non-lazy releasable:

The same as lazy releasable delegates but without kotlin.lazy behaviour

    private val pauseableString by pauseable(VideoPlayer.create(...), {
        it.pause
    })

    private val pauseableResumablePlayer by pauseableResumable(VideoPlayer.create(...), onPause = {
        it.pause()
    }, onResume = {
        it.play()
    })

    private val resumeableField by resumeable(...)
    private val startableField by startable(...)
    private val stoppableField by stoppable(...)
    private val stoppableStartableField by stoppableStartable(...)
    private val destroyableField by destroyable(...)
    private val creatableField by creatable(...)
    private val creatableDestroyableField by creatableDestroyable(...)
Kotlin

Own more custom releasable delegate implementation:

    // lazy
    val customLazyReleasablePlayer by LifecycleLazyReleasableDelegate<Player>({ Player.create(context) },
        Lifecycle.Event.ON_CREATE to { it.init(context) },
        Lifecycle.Event.ON_DESTROY to { it.release() },
        Lifecycle.Event.ON_RESUME to { it.resume() },
        Lifecycle.Event.ON_START to { it.start() },
        ...
    )

    // non-lazy
    val customLazyReleasablePlayer by LifecycleReleasableDelegate<Player>(Player.create(),
        Lifecycle.Event.ON_CREATE to { it.init(context) },
        Lifecycle.Event.ON_DESTROY to { it.release() },
        Lifecycle.Event.ON_RESUME to { it.resume() },
        Lifecycle.Event.ON_START to { it.start() },
        ...
    )
Kotlin

GitHub