Android: How do I set the zoom level of map view to 1 km radius around my current location?

The following code is what ended up using. Given the screen width and the fact that at zoom level 1 the equator of Earth is 256 pixels long and every subsequent zoom level doubles the number of pixels needed to represent earths equator, the following function returns the zoom level where the screen will show an area of 2Km width.

Google maps seems to work closely to miles/pixel. At zoom=13, 1 mile= 100 pixels. 2 miles = 200 pixels.

Each zoom leven increases or decreases by a factor of 2. Therefore, at Zoom 14, 1 mile = 200 pixels and at zoom 12, 1 mile = 50 pixels.

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