我创建了一个简单MapActivity在我的Andr​​oid和发现它的图形页面不能被放大到超过19级变焦式按钮即可变灰。调用zoomIn（）方法也没有效果，水平仍停留在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.

不过，当我开始在谷歌官方地图应用程序，成功地拉近两个级别21，地图上的完全一样的区域

However, when I start the official Google Maps application, exactly the same area of the map successfully zooms in two more levels to 21.

谁能告诉我怎样，我可以进一步在自己的应用程序放大？我缺少明确设置一些参数（清单，mapactivity，mapcontroller）？真的找不到出这么远，觉得挺困惑的是，眼看着差异。

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.

一个类似question最近被问过，但还停留解答。

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

推荐答案

最大变焦水平取决于你在地图上的区域。

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

您可以通过调用获得可用的最大缩放级别 #getMaxZoomLevel（）在图形页面。这是你就能搞定，无论是在官方的谷歌地图应用程序发生的事情最接近的变焦。

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.