Koin 的生命周期范围与 activity.scope。它们相同吗？

Question

我正在从 https://github.com/InsertKoinIO/koin/blob/master/koin-projects/docs/reference/koin-android/scope.md

学习 Koin 的范围

如果我有如下的Koin模块

val myModule =
    module {
        scope<MyActivity> { scoped { Presenter() } }
    }

在我的 activity 中，我可以做到这一点

class MyActivity : AppCompatActivity() {

    private val presenter by lazy {
        lifecycleScope.get<Presenter>(Presenter::class.java)
    }
    // ...
}

或者我可以使用 this.scope，其中 this 是 MyActivity 对象。

class MyActivity : AppCompatActivity() {

    private val presenter by lazy {
        this.scope.get<Presenter>(Presenter::class.java)
    }
    // ...
}

我测试了他们是一样的。两者是相同的，还是不同的？如果不同，它们的区别是什么？

Answer 1

根据我跟踪的代码，lifecycleScope 将在 ON_DESTROY

时自动关闭

所以我从 lifecycleScope -> getOrCreateAndroidScope() -> createAndBindAndroidScope -> bindScope(scope) -> lifecycle.addObserver(ScopeObserver(event, this, scope))

追踪

代码如下所示。

val LifecycleOwner.lifecycleScope: Scope
    get() = getOrCreateAndroidScope()

private fun LifecycleOwner.getOrCreateAndroidScope(): Scope {
    val scopeId = getScopeId()
    return getKoin().getScopeOrNull(scopeId) ?: createAndBindAndroidScope(scopeId, getScopeName())
}

private fun LifecycleOwner.createAndBindAndroidScope(scopeId: String, qualifier: Qualifier): Scope {
    val scope = getKoin().createScope(scopeId, qualifier, this)
    bindScope(scope)
    return scope
}

fun LifecycleOwner.bindScope(scope: Scope, event: Lifecycle.Event = Lifecycle.Event.ON_DESTROY) {
    lifecycle.addObserver(ScopeObserver(event, this, scope))
}

class ScopeObserver(val event: Lifecycle.Event, val target: Any, val scope: Scope) :
    LifecycleObserver, KoinComponent {

    /**
     * Handle ON_STOP to release Koin modules
     */
    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    fun onStop() {
        if (event == Lifecycle.Event.ON_STOP) {
            scope.close()
        }
    }

    /**
     * Handle ON_DESTROY to release Koin modules
     */
    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    fun onDestroy() {
        if (event == Lifecycle.Event.ON_DESTROY) {
            scope.close()
        }
    }
}