import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;

public class VehiclesMapFragment extends MapFragment implements OnMapReadyCallback  {

GoogleMap _map;

private void setUpMapIfNeeded() {

    if (_map == null) {

        //this.getMapAsync(this);
        _map = this.getMap();

        if (_map != null) {
            ReDrawList(_vehicles);
        }
    }
}

@Override
public void onMapReady(GoogleMap googleMap) {
    _map = googleMap;
    ReDrawList(_vehicles);
}



public VehiclesMapFragment() {

}

VehiclesPosition[] _vehicles = null;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    _vehicles = (VehiclesPosition[])getArguments().getSerializable("VEHICLES");

    //setUpMapIfNeeded();

}



public void ReDrawList(VehiclesPosition[] vehicles)
{
    if(vehicles != null && vehicles.length > 0 && _map != null)
    {

        LatLngBounds bounds = null;
        for(VehiclesPosition vp : vehicles)
        {
            LatLng latlngPos = vp.GetMapLatLng();

            if(bounds == null)
                bounds = new LatLngBounds(latlngPos, latlngPos);
            else
                bounds = bounds.including(latlngPos);

            _map.addMarker(vp.GetMapMarker()).showInfoWindow();

        }

            try{
                _map.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds,100));
            }catch (Exception exx) {
                _map.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds,400,400,100));
            }
    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    View v =  inflater.inflate(R.layout.fragment_vehicles_map, container, false);

    setUpMapIfNeeded();


    return v;
}



@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mListener = (OnFragmentInteractionListener) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString()+ " must implement OnFragmentInteractionListener");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

@Override
public void onResume() {
    super.onResume();
    //setUpMapIfNeeded();
}

private OnFragmentInteractionListener mListener;

public interface OnFragmentInteractionListener {
    public void onFragmentInteraction(Uri uri);
}

}

<fragment 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"
android:id="@+id/map"
tools:context=".MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment" />

Bundle args = new Bundle();
args.putSerializable("VEHICLES",_VehiclesList);
fragment_units_map = new VehiclesMapFragment();
_fragment_units_map.setArguments(args);