Android - Polyline encoding algorithm?

Question

In my android project I have List of GeoPoints. I have a algorithm to decode the encoded polyline string. Can anyone help me for encoding the List of GeoPoints to polyline string in-order to save this in Shared Preferences.

Answer 1

For Java generally, the official Google Maps Services for Java library has a utility, too.

PolylineEncoding.decode(String);
PolylineEncoding.encode(List<LatLng>); // Note that this is not the Android LatLng

Code is here.

Answer 2

you should include the new googlemaps utils library for Android and then use PolyUtil:

PolyUtil.encode(latLngPath)
PolyUtil.decode(encodedPath)

Answer 3

From Google:

http://groups.google.com/group/google-maps-api/browse_thread/thread/c85319eb7fd930dc

Seems like an Java Polyline impl. in progress.

From Github:

https://github.com/markrambow/JavaPolylineEncoder

https://github.com/petpen/JavaPolylineEncoder2

And the spec is here:

https://developers.google.com/maps/documentation/utilities/polylinealgorithm