不使用单一活动的导航体系结构

Navigation Architecture 框架来显示一些片段。不幸的是,每个片段都在创建一个新的活动。 Activity 具有 intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP) intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP) 但他们没有太大的帮助,因为使用他们不会显示任何碎片后,第一次显示。

<?xml version="1.0" encoding="utf-8"?>
    <navigation xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/notification_nav_graph"
        app:startDestination="@id/openingNotificationFragment">
        <fragment
            android:id="@+id/standByScreenFragment"
            android:name="com.emaz.android.ui.notification.standby.StandByScreenFragment"
            android:label="StandByScreenFragment" />
        <fragment
            android:id="@+id/welcomeNotificationFragment"
            android:name="com.emaz.android.ui.notification.welcome.WelcomeNotificationFragment"
            android:label="WelcomeNotificationFragment" />
        <fragment
            android:id="@+id/openingNotificationFragment"
            android:name="com.emaz.android.ui.notification.ingress..OpeningNotificationFragment"
            android:label="OpeningFragment" />
        <fragment
            android:id="@+id/closingNotificationFragment"
            android:name="com.emaz.android.ui.notification.ingress..ClosingNotificationFragment"
            android:label="ClosingNotificationFragment" />
    </navigation>

家庭活动 打电话 NotificationActivity 作为

val intent = Intent(this, NotificationActivity::class.java)
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
                intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
                startActivity(intent)

notification_container.visibility = View.GONE
            fragment_layout.visibility = View.VISIBLE
            val navController = Navigation.findNavController(this, nav_host_fragment.id)

            navController.popBackStack()
            Log.e("nav", "${navController.currentDestination} and $resId < ResourceId")

            navController.navigate(resId, null)

resId 请帮忙。