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GetMapAsync is null

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Hi guys ,
I gonna add googlemap to fragment but GetMapAsync is null , 3 days i tried to solve this probem but i could not :/ :( , please helpe me and save my time. :)
or Maybe for my emulator ?
Thank you so much
Radin.

My Codes :

fragmentContainer :
-------------------------------------------------------------->
<?xml version="1.0" encoding="utf-8"?>




FragmenyLayout :

<?xml version="1.0" encoding="utf-8"?>




----------------------------------------------------------->

fragment class :
public class frg : Fragment
{

    public override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        // Create your fragment here
    }

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.Inflate(Resource.Layout.myFragmenyLayout, container, false);

    }

}
----------------------------------------------------------->
Activity :

public class googleMap : Activity, IOnMapReadyCallback
{

    GoogleMap map;
    MapFragment mapFrag;

    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.myFragmenyLayout);

        if (map == null)
        {
            mapFrag = (MapFragment)FragmentManager.FindFragmentById(Resource.Id.frag1);
            mapFrag.GetMapAsync(this);

        }

 public void OnMapReady(GoogleMap googleMap)
    {
        this.map = googleMap;
    }


    }
}

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