Java 谷歌地图V2安卓平铺在特定缩放级别后不会显示

我是谷歌地图的新手。为什么当我尝试放大（使用控件或点击）时，在相对较高的放大级别后，瓷砖停止加载，我看到的只是一个像素化视图

以下是我的完整活动：

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
    private GoogleMap mMap;
    private SupportMapFragment mapFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onResume() {
        System.out.println("Onresume");
        mapFragment.onResume();
        super.onResume();
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        LatLng center = new LatLng(47.49801, 19.03991);

        mMap.addMarker(new MarkerOptions().position(center).title("Marker"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(center));
    }
}

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使用zoom-laval所需的值

  mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mLocation, 5f));