Lifecycle.Event.ON_DESTROY 未在应用程序中调用

Question

我想在用户退出应用程序时调用一些方法（请参阅 1, 2 获取帮助）。

class BaseApplication : Application(), LifecycleObserver {

    override fun onCreate() {
        super.onCreate()

        // Register observer.
        ProcessLifecycleOwner.get().lifecycle.addObserver(this)
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_CREATE) 
    fun init() {
        println("*** called onCreate()")
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_START) 
    fun LibOnStart() {
        println("*** called onStart()")
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP) 
    fun LibOnStop() {
        println("*** called onStop()")
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) 
    fun LibOnResume() {
        println("*** called onResume()")
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) 
    fun LibOnPause() {
        println("*** called onPause()")
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY) 
    fun cleanup() {
        println("*** called onDestroy()")
    }
}

除了 ON_DESTROY.

之外，这些事件都会被触发

I/System.out: *** called onPause() of Activity
I/System.out: *** called onStop() of Activity

可能 Application 没有从内存中清除。如果我从最近的列表中滑动应用程序或强制停止，它不会触发 destroy 事件。也许这些事件在 Activity 中有效。如何在 Application 中捕获 destroy 事件？

Answer 1

Documentation 声称

You can consider this LifecycleOwner as the composite of all of your Activities, except that Lifecycle.Event.ON_CREATE will be dispatched once and Lifecycle.Event.ON_DESTROY will never be dispatched.

所以无法在应用程序中处理onDestroy。

或者，您可以尝试使用 Service class 的 onTaskRemoved 回调来捕捉应用从最近应用中删除的时刻。

Lifecycle.Event.ON_DESTROY 未在应用程序中调用

Lifecycle.Event.ON_DESTROY is not called in Application

android

application-lifecycle