Google Maps API v2 fails to display 3D

private void mapInit(){
        isMapInit=true;
        // Get LocationManager
        locationManager=(LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        // Get current location information from GPS
        Location myLocate=locationManager.getLastKnownLocation("gps");
        // map type setting
        GoogleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
        GoogleMap.setBuildsEnabled(true);
        boolean test=googleMap.isBuildsEnabled();

        // display the current position button
        googleMap.setMyLocationEnabled(true);
        mLocationClient=newGoogleApiClient.Builder(this)
        .addApi (LocationServices.API)
        .addConnectionCallbacks (this)
        .addOnConnectionFailedListener(this)
        .build();
        if(mLocationClient!=null){
            mLocationClient.connect();
        }
}