How to zoom camera to cover the path in android googlemap?

问题

I have covered multiple locations in Google map using LatLng.Builder and it's working. Is there any way I could cover the whole path between two location in Google map?

My Curent Code to include multiple locations

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

Any suggestion please?
Thanks

回答1:

I know you already find the answer, but here is my method to solve the problem

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));
        }

回答2:

The solution was simple

This might help someone in the future if looking for this sort of feature.

This method is called after the google direction API returns the route from location A to B. directionPoints is the list of Points in the route.

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

The json response from the Google Direction API

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

So I used this bound's lat and lng as parameter to 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);

and included these points in LatLngBounds.Builder

来源：https://stackoverflow.com/questions/25499591/how-to-zoom-camera-to-cover-the-path-in-android-googlemap

标签

android

google-maps

android-maps-v2