如何缩放相机以覆盖Android googlemap中的路径？

Question

我已经在Google map使用中覆盖了多个位置LatLng.Builder并且它正在工作.有什么方法可以覆盖两个位置之间的整条路径Google map吗？

我的Curent Code包含多个位置

builder = new LatLngBounds.Builder();
builder.include(LatLng1);
builder.include(LatLng2);
googleMap.animateCamera(CameraUpdateFactory.newLatLngBounds(builder.build(), 17));

有什么建议吗？
谢谢

Answer 1

我知道你已经找到了答案,但这是我解决问题的方法

boolean hasPoints = false;
        Double maxLat = null, minLat = null, minLon = null, maxLon = null;

        if (polyline != null && polyline.getPoints() != null) {
            List<LatLng> pts = polyline.getPoints();
            for (LatLng coordinate : pts) {
                // Find out the maximum and minimum latitudes & longitudes
                // Latitude
                maxLat = maxLat != null ? Math.max(coordinate.latitude, maxLat) : coordinate.latitude;
                minLat = minLat != null ? Math.min(coordinate.latitude, minLat) : coordinate.latitude;

                // Longitude
                maxLon = maxLon != null ? Math.max(coordinate.longitude, maxLon) : coordinate.longitude;
                minLon = minLon != null ? Math.min(coordinate.longitude, minLon) : coordinate.longitude;

                hasPoints = true;
            }
        }

        if (hasPoints) {
            LatLngBounds.Builder builder = new LatLngBounds.Builder();
            builder.include(new LatLng(maxLat, maxLon));
            builder.include(new LatLng(minLat, minLon));
            map.moveCamera(CameraUpdateFactory.newLatLngBounds(builder.build(), 48));
        }

Answer 2

解决方案很简单

如果寻找这种功能,这可能会帮助将来的某个人.

google direction API返回路径后调用此方法location A to B.directionPoints是list路线中的积分.

public void handleResult(ArrayList<LatLng> directionPoints)
    {
        PolylineOptions rectLine = new PolylineOptions().width(3).color(Color.RED);
        for(int i = 0 ; i < directionPoints.size() ; i++)
        {
            rectLine.add(directionPoints.get(i));
        }

        //this polyline is stored so that it can be removed by calling drawnRoutePath.remove() if needed
        drawnRoutePath = googleMap.addPolyline(rectLine);
        prepareBuilder(directionPoints);
        googleMap.animateCamera(CameraUpdateFactory.newLatLngBounds(builder.build(), 17));
    }

UPDATE

来自Google Direction API的json响应

"routes" : [
      {
         "bounds" : {
            "northeast" : {
               "lat" : 27.7136953,
               "lng" : 85.32216629999999
            },
            "southwest" : {
               "lat" : 27.7103725,
               "lng" : 85.3214952
            }
         },
.... etc

所以我使用了这个绑定lat和lng作为参数LatLngBounds.Builder.

JSONObject jsonBound = ((JSONObject)jRoutes.get(i)).getJSONObject("bounds");
JSONObject jsonSouthWest = jsonBound.getJSONObject("southwest");
JSONObject jsonNorthEast = jsonBound.getJSONObject("northeast");
LatLng boundSouthWest = new LatLng(jsonSouthWest.getDouble("lat"),jsonSouthWest.getDouble("lng"));
LatLng boundNorthEast = new LatLng(jsonNorthEast.getDouble("lat"),jsonNorthEast.getDouble("lng"));
ArrayList<LatLng> bounds = new ArrayList<LatLng>();
bounds.add(boundNorthEast);
bounds.add(boundSouthWest);

并包括这些要点 LatLngBounds.Builder