如何使用Android API V2在GoogleMap上绘制数千个正方形

Question

I need to draw on a Map ( Google Map android api v2 ) a lot of squares( 1000 + ), and a few circle.

Under android api V1 it was possible to do that but with the new api it's hard to draw more of 400 squares ( after it's too slow ).

So I don't know how to to for solve this problem. It is possible to use one google map and a textureView ? ( for draw my squares in opengl )

Answer 1

I've got a test file with 1000 polygons and 35000 lat/lng pairs total and am able to load that from a file to a Google Maps V2 map in about 4 seconds on a Nexus 10. I also have a test file of 12000 polygons, 48000 lat/lng pairs, that loads in about 20 seconds. But supporting datasets larger than that seems to be without a purpose as with this many objects the map is fairly slow to scroll around. And the Nexus 10 is one of the fastest Android devices out there.

I give you these numbers to give you an idea of what performance you might be able to extract. I would say Maps V2 in general is faster than I was able to do on Maps V1, although my skills are further developed, I have spent more time optimizing, and devices have gotten faster since I was using Maps V1.

Most of the optimizations that I have made actually involved things other than the map itself so you might not want to jump to the assumption that Maps is the problem. For instance, I used to load the data from SQLite and didn't have proper indexes on the tables. Fixing that gave ~50% speedup. Then I changed my app to load directly from shape files instead of the database and that helped some (but mostly I avoid the slow process of importing to the database).

So in the end my advice to you is to bust out System.getCurrentMillis() (writing to LogCat) and see where the actual performance bottlenecks are. 1000 squares should have OK performance on Maps V2 although it is probably slow enough to warrant a loading progress indicator.