如何在Android中缓冲折线或在折线周围绘制多边形? [英] How to buffer a polyline in Android or draw a polygon around a polyline?

问题描述

我正在尝试在适用于Android的MapsV2中的多义线周围放置一个缓冲区，但我还没有找到方法，我正在考虑在该多义线周围绘制多边形，但还没有发现任何这样做的人，有可能吗?

I am trying to put a buffer around a polyline in MapsV2 for android but I haven't find how to do it yet, I was thinking on drawing a polygon around the polyline but also haven't found anyone that have done that, is it possible?

推荐答案

(

in Google's directions api (https://maps.googleapis.com/maps/api/directions/json?origin=75+9th+Ave+New+York,+NY&destination=MetLife+Stadium+1+MetLife+Stadium+Dr+East+Rutherford,+NJ+07073&key=YOUR_API_KEY ) you get one overview_polyline jsonObject, get encoded points From here, and decode it using this method:

private List<LatLng> decodePoly(String encoded) {

        List<LatLng> poly = new ArrayList<>();
        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;
    }

您会获得经纬度列表，现在，使用google map的 getMapAsync 方法将此latlng添加到您的地图中:

You get List of latitude and longitude, now, using google map's getMapAsync Method add this latlng in your map :

googleMap.addPolyline(new PolylineOptions().geodesic(true).addAll(latLngList));

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