Question

使用google map integrtaion处理应用程序时。我有2个类RoutesData,LocationDistances和一个活动类，我在其中实现一个方法getOverAllRoute()来从一个方法返回的列表中选择一个LatLng对象RoutesData类，与特定LatLng对象的距离最小。

public class RoutesData{
...
...
public ArrayList<LatLng> allRoutePoints(){
        ArrayList<LatLng> allPoints = new ArrayList<LatLng>(Arrays.asList(
                //icPoints
                new LatLng(33.582752, 73.044503),
                new LatLng(33.595504, 73.050912),
                //station
                new LatLng(33.601097, 73.047798),
                new LatLng(33.598755, 73.055607),
                .. .
                . . 
    ));
        return allPoints;
    }



public class LocationDistances {
    LatLng locs;
    double distances;

}




public void getOverAllRoute(){
        RoutesData rD = new RoutesData();
        ArrayList<LatLng> mainRoutePoints = rD.allRoutePoints();
        LocationDistances srcLocDis = new LocationDistances(); //to store location + distances from source
        ArrayList<LocationDistances> srcLocDisList = new ArrayList();
        //convert source latlng to location obj
        Location srcLoc = new Location("");
        srcLoc.setLatitude(dll.latitude);
        srcLoc.setLongitude(dll.longitude);
        // to compare distances from source location
        for(int i =0;i<mainRoutePoints.size();i++){
            Location mainPointsLoc = new Location("");
            mainPointsLoc.setLatitude(mainRoutePoints.get(i).latitude);
            mainPointsLoc.setLongitude(mainRoutePoints.get(i).longitude);
            //store distances and location in arraylist
            srcLocDis.locs = mainRoutePoints.get(i);
            srcLocDis.distances = srcLoc.distanceTo(mainPointsLoc);
            srcLocDisList.add(srcLocDis);

        }
        LocationDistances min=null;
        for(LocationDistances x:srcLocDisList){
            min=(min==null||x.distances<min.distances)?x:min;
            Log.d("LocDist:",Double.toString(x.distances));
        }
        srcStartMin=min.locs;
        Toast.makeText(this,srcStartMin.latitude+" "+srcStartMin.longitude, Toast.LENGTH_LONG).show();

    }

但是当我从菜单项调用getOverAllRoutes（）方法时，我的应用程序崩溃了。

Answer 1

我怀疑它与

有关

srcLoc.setLatitude(dll.latitude);
srcLoc.setLongitude(dll.longitude);

因为我没有看到初始化

选择距离特定LatLng对象android的距离最小的位置

1 个答案: