CODEWITHSUNDEEP
androidgoogle-mapsandroid-mapviewandroid-mapsbounding-box
Tom Cameron
Tom Cameron

Reputation: 31

How to get minimum/maximum latitude and longitude from a MapView?

Currently I am using the following code to get the minimum and maximum latitude and longitude from a (Google Maps) MapView object.

GeoPoint center = map.getMapCenter();
Double minLat = (center.getLatitudeE6() - (map.getLatitudeSpan() / 2)) / 1E6;
Double minLong = (center.getLongitudeE6() - (map.getLongitudeSpan() / 2)) / 1E6;
Double maxLat = (center.getLatitudeE6() + (map.getLatitudeSpan() / 2)) / 1E6;
Double maxLong = (center.getLongitudeE6() + (map.getLongitudeSpan() / 2)) / 1E6;

Unfortunately, this is not giving me a correct output. I am currently at zoom level 18 in the MapView, centred on the point (52.9476, -1.1452). The output of the above code gives the values (52.947632, -181.145156, 52.947632, 178.854844) respectively. Obviously there is an issue here in that the minimum latitude shown is a physical impossibility, and the latitudes are both exactly the same as the centre latitude. I can confirm that the MapView itself is showing the location correctly.

Can anyone explain why this is happening? Of all the solutions to this issue I have seen, this is the only one that people seem to have had any luck with and it still doesn't work!

Upvotes: 1

Views: 1263

Answers (1)

Tom Cameron
Tom Cameron

Reputation: 31

I've now solved this issue myself. Essentially, before the Projection of the MapView is ready, these functions will respectively return 0 and 360*1E6 for latitude and longitude. As such, all that needs to be done is in an AsyncTask perform checks on these values until they have been prepared.

Upvotes: 1

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