no scroll for images with height and size more than the dispay

I have an image with w/h more than the screen size. So i programmatically create a new view. When i zoom there is a scroll property. But on the initial position there is no scroll

```
mMapView = new MapView(this);
mMapView.setLayoutParams(new LayoutParams(bitmap.getWidth(), bitmap.getHeight()));
mMapView.setImageBitmap(bitmap);
```