android mapview maximum zoom level only 19

I created a simple MapActivity on my android and discovered that its MapView can't be zoomed in to more than level 19. The zoom-in button just greys out. Calling the zoomIn() method is also to no effect, the level still stays at 19.

However, when I start the official Google Maps application, exactly the same area of the map successf开发者_运维技巧ully zooms in two more levels to 21.

Can anybody advise me on how I can zoom further in my own app? Am I missing setting some parameter explicitly (manifest, mapactivity, mapcontroller)? Really can't find out so far and feel quite confused about it, seeing the difference.

A similar question has been asked recently, but also stays unanswered.

The maximum zoom level depends on the area of the map you are in.

You can get the maximum zoom level available by calling #getMaxZoomLevel() in your MapView. That's the closest zoom you will be able to get, no matter what happens in the official Google Maps application.