CurrentPageCallback.kt

import android.app.Activity
import android.app.Application
import android.os.Bundle
import android.view.View
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import androidx.fragment.app.FragmentManager

class CurrentPageCallback : Application.ActivityLifecycleCallbacks {

    private val callback = object : FragmentManager.FragmentLifecycleCallbacks() {
        override fun onFragmentViewCreated(fm: FragmentManager, f: Fragment, v: View, savedInstanceState: Bundle?) {
            println("current screen:Fragment -> ${f::class.java.name}")
        }
    }

    override fun onActivityStarted(activity: Activity) {
        require(activity is FragmentActivity)
        activity.supportFragmentManager.registerFragmentLifecycleCallbacks(callback, true)
    }

    override fun onActivityStopped(activity: Activity) {
        require(activity is FragmentActivity)
        activity.supportFragmentManager.unregisterFragmentLifecycleCallbacks(callback)
    }

    override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
        println("current screen:Activity -> ${activity::class.java.name}")
    }

    override fun onActivityResumed(activity: Activity) {

    }

    override fun onActivityPaused(activity: Activity) {

    }

    override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {

    }

    override fun onActivityDestroyed(activity: Activity) {

    }
}