让Google地图自动放大我的当前位置？

可能与Google Maps v2重复- 设置我的位置并放大

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_g_maps);
        GoogleMap googleMap;
        LatLng myPosition;


        SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);

        googleMap = fm.getMap();
        googleMap.setMyLocationEnabled(true);
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        Criteria criteria = new Criteria();
        String provider = locationManager.getBestProvider(criteria, true);
        Location location = locationManager.getLastKnownLocation(provider);

                if(location!=null){
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        LatLng latLng = new LatLng(latitude, longitude);
        myPosition = new LatLng(latitude, longitude);


    }

}
}

我试过添加:

CameraUpdate center=
        CameraUpdateFactory.newLatLng(new LatLng(latitude,
                                                 longitude));
    CameraUpdate zoom=CameraUpdateFactory.zoomTo(15);

    googleMap.moveCamera(center);
    googleMap.animateCamera(zoom);

要么

 googleMap.moveCamera( CameraUpdateFactory.newLatLngZoom(new LatLng(latitude, longitude) ,4) );

但是,一旦我点击调用此方法的按钮,Google地图就不会自动放大.我仍然可以点击Google UI,我可以点击它来放大我的位置,但我希望它能自动放大.

有什么帮助吗？