如何在Android Studio中将快照添加到Roads Google Map

Question

Hello I would like to ask how to add Snap to Road when I have the route given by google map API. I have a bunch of Lat lang from point A line to point B line and draw a lines like Polylines, but what i want is how to add this code snap to Road from given route? this is how to add more points from the Point A to Point B, here is what i want to add, https://developers.google.com/maps/documentation/roads/snap

my project is look like this

Answer 1

1. Get overview_polyline by Json and Gson (should use https://maps.googleapis.com/maps/api/directions/json?origin=...&destination=place_id:...&mode=DRIVING&key=.. .)

2. Decode it to List by function

    public List<LatLng> decodePoly(String encoded) { // encoded is overview_polyline.points; List<LatLng> poly = new ArrayList<LatLng>(); int index = 0, len = encoded.length(); int lat = 0, lng = 0; while (index < len) { int b, shift = 0, result = 0; do { b = encoded.charAt(index++) - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lat += dlat; shift = 0; result = 0; do { b = encoded.charAt(index++) - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lng += dlng; LatLng p = new LatLng((((double) lat / 1E5)), (((double) lng / 1E5))); poly.add(p); } return poly; } 

   3.Add to map:

    PolylineOptions polylineOptions= new PolylineOptions(); polylineOptions.addAll(decodePoly(overview_polyline.points)); mGoogleMap.addPolyline(polylineOptions.width(5).color(Color.BLUE).geodesic(false));