1.MvpMapViewFragment.kt

import android.os.Bundle
import android.view.View
import androidx.fragment.app.Fragment
import com.arellomobile.mvp.MvpDelegate
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.MapView

/**
 * Для использования MapView
 *
 * Created by Roman Savelev (aka @rsa) on 09.04.2019
 */


abstract class MvpMapViewFragment : Fragment() {

    abstract val mapResId:Int
    open fun onMapReady() {}

    private var isMapReady = false
    private var mIsStateSaved = false

    lateinit var map: GoogleMap
    lateinit var mapView: MapView

    private val mvpDelegate: MvpDelegate<out MvpMapViewFragment> by lazy { MvpDelegate(this) }
    var mapBundle:Bundle? = null

    companion object {
        private const val KEY_MAP_VIEW_STATE = "mapview_state"
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mvpDelegate.onCreate(savedInstanceState)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        mapView = view.findViewById(mapResId) as MapView

        if (savedInstanceState == null) {
            mapView.onCreate(mapBundle)
        }else
            mapView.onCreate(savedInstanceState.getBundle(KEY_MAP_VIEW_STATE))

        isMapReady = false
        mapView.getMapAsync {
            map = it
            isMapReady = true
            onMapReady()
            mvpDelegate.onAttach()
        }
    }


    override fun onStart() {
        super.onStart()
        mIsStateSaved = false
        if (isMapReady) {
            mvpDelegate.onAttach()
        }
    }

    override fun onResume() {
        super.onResume()
        mIsStateSaved = false
        if (isMapReady) {
            mvpDelegate.onAttach()
        }

        mapView.onResume()
    }

    override fun onPause() {
        super.onPause()
        mapView.onPause()
    }

    override fun onStop() {
        super.onStop()
        mvpDelegate.onDetach()
        mapView.onStop()
    }

    override fun onDestroyView() {
        super.onDestroyView()
        mvpDelegate.onDetach()
        mvpDelegate.onDestroyView()

        // Нужно сохранить состояние тут, потому что при detatch/attach фрагмента
        // (например если используется bottom navigation) вызов onSaveInstanceState()/onCreate()
        // не происходят, а просто пересоздаётся view onViewCreate()/onDestroyView(),
        // при этом инстенс фрагмента не уничтожается и переменная mapBundle хранит нужное состояние
        mapBundle = Bundle().also { mapView.onSaveInstanceState(it) }
        
        if (isMapReady)
            map.clear() // For avoid the memory leak
    }

    override fun onDestroy() {

        super.onDestroy()

        // We leave the screen and respectively all fragments will be destroyed
        if (activity!!.isFinishing) {
            mvpDelegate.onDestroy()
            return
        }

        // When we rotate device isRemoving() return true for fragment placed in backstack
        // http://stackoverflow.com/questions/34649126/fragment-back-stack-and-isremoving
        if (isStateSaved) {
            mIsStateSaved = false
            return
        }

        // See https://github.com/Arello-Mobile/Moxy/issues/24
        var anyParentIsRemoving = false
        var parent = parentFragment
        while (!anyParentIsRemoving && parent != null) {
            anyParentIsRemoving = parent.isRemoving
            parent = parent.parentFragment
        }

        if (isRemoving || anyParentIsRemoving) {
            mvpDelegate.onDestroy()
        }

        mapView.onDestroy()
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)

        mIsStateSaved = true
        mvpDelegate.onSaveInstanceState(outState)
        mvpDelegate.onDetach()

        mapBundle = Bundle()
        mapView.onSaveInstanceState(mapBundle)
        outState.putBundle(KEY_MAP_VIEW_STATE, mapBundle)
    }

    override fun onLowMemory() {
        super.onLowMemory()
        mapView.onLowMemory()
    }

}

2.fragment_map_with_mapview.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             >

   <com.google.android.gms.maps.MapView
            android:id="@+id/map"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
    />

</FrameLayout>

3.MvpMapFragment.kt

import android.os.Bundle
import android.view.View
import androidx.fragment.app.Fragment
import com.arellomobile.mvp.MvpDelegate
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.SupportMapFragment

/**
 * Для использования SupportMapFragment
 *
 * Created by Roman Savelev (aka @rsa) on 09.04.2019
 */

abstract class MvpMapFragment : Fragment() {

    abstract val mapContainerId:Int
    open fun onMapReady() { }

    private var isMapReady = false
    private var mIsStateSaved: Boolean = false

    lateinit var map: GoogleMap
    val mapView: View get() = (childFragmentManager.findFragmentById(mapContainerId) as SupportMapFragment).view!!

    private val mvpDelegate: MvpDelegate<out MvpMapFragment> by lazy { MvpDelegate(this) }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        var mapFragment = childFragmentManager.findFragmentById(mapContainerId) as? SupportMapFragment
        if (mapFragment == null) {
            mapFragment = SupportMapFragment()
            childFragmentManager.beginTransaction().replace(mapContainerId, mapFragment).commit()
        }

        isMapReady = false
        mapFragment.getMapAsync {
            this.map = it
            isMapReady = true
            onMapReady()
            mvpDelegate.onAttach()
         }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mvpDelegate.onCreate(savedInstanceState)
    }

    override fun onStart() {
        super.onStart()

        mIsStateSaved = false
        if (isMapReady)
            mvpDelegate.onAttach()
    }

    override fun onResume() {
        super.onResume()

        mIsStateSaved = false
        if (isMapReady)
            mvpDelegate.onAttach()
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)

        mIsStateSaved = true

        mvpDelegate.onSaveInstanceState(outState)
        mvpDelegate.onDetach()
    }

    override fun onStop() {
        super.onStop()
        mvpDelegate.onDetach()
    }

    override fun onDestroyView() {
        super.onDestroyView()
        mvpDelegate.onDetach()
        mvpDelegate.onDestroyView()
        if (isMapReady)
            map.clear() // For avoid the memory leak
    }

    override fun onDestroy() {
        super.onDestroy()

        //We leave the screen and respectively all fragments will be destroyed
        if (activity!!.isFinishing) {
            mvpDelegate.onDestroy()
            return
        }

        // When we rotate device isRemoving() return true for fragment placed in backstack
        // http://stackoverflow.com/questions/34649126/fragment-back-stack-and-isremoving
        if (mIsStateSaved) {
            mIsStateSaved = false
            return
        }

        // See https://github.com/Arello-Mobile/Moxy/issues/24
        var anyParentIsRemoving = false
        var parent = parentFragment
        while (!anyParentIsRemoving && parent != null) {
            anyParentIsRemoving = parent.isRemoving
            parent = parent.parentFragment
        }

        if (isRemoving || anyParentIsRemoving) {
            mvpDelegate.onDestroy()
        }
    }

}

4.fragment_map_with_container.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             >

    <FrameLayout
            android:id="@+id/map_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
    />

</FrameLayout>