Android Map v2 Api level 8 map load only when tapped the screen

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http://stackoverflow.com – i have a problem loading maps with Android Map V2, the fragment is loading well, but the map is not loading until i tap on the screen for 5/6 times.. There is my WhereMap.java code: package com.example.senigallia.it; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.MarkerOptions; import com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.SupportMapFragment; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.widget.Toast; public class (HowTos)