Polylineoptions Cannot Be Null

I am making a map application where I am showing route between two points (dynamically). In this I am retrieving latitude and longitude from the database (which can change with tim

Solution 1:

I review your code and found some issue where causes of crash, first of all you had initialize null ArrayList<LatLng>points=null and PolylineOptions lineOptions=null so what if path is null then lineOptions too null, thus i fix that line review below code apply it run it, if success Enjoy!

@Override
        protectedvoid onPostExecute(List<List<HashMap<String, String>>> result) {
            ArrayList<LatLng> points = new ArrayList<LatLng>();;
            PolylineOptions lineOptions = new PolylineOptions();;
                lineOptions.width(2);
                lineOptions.color(Color.RED);
            MarkerOptions markerOptions = new MarkerOptions();
            // Traversing through all the routesfor(int i=0;i<result.size();i++){
                // Fetching i-th routeList<HashMap<String, String>> path = result.get(i);
                // Fetching all the points in i-th routefor(int j=0;j<path.size();j++){
                    HashMap<String,String> point = path.get(j);
                    double lat = Double.parseDouble(point.get("lat"));
                    double lng = Double.parseDouble(point.get("lng"));
                    LatLng position = new LatLng(lat, lng);
                    points.add(position);
                }
                // Adding all the points in the route to LineOptions
                lineOptions.addAll(points);

            }
            // Drawing polyline in the Google Map for the i-th routeif(points.size()!=0)mMap.addPolyline(lineOptions);//to avoid crash
        }

Solution 2:

Why you are you initializing ArrayList,PolylineOption under for loop it will create new instance as many time for loop runs so try to fix these and add two mMap.moveCamera(CameraUpdateFactory.newLatLng(position)); mMap.animateCamera(CameraUpdateFactory.zoomTo(10));

            ArrayList<LatLng> points = new ArrayList<LatLng>();
        PolylineOptions lineOptions = new PolylineOptions();;
        MarkerOptions markerOptions = new MarkerOptions();
        LatLng position = null;
        // Traversing through all the routesfor(int i=0;i<result.size();i++){

          List<HashMap<String, String>> path = result.get(i);
            // Fetching all the points in i-th routefor(int j=0;j<path.size();j++){
                HashMap<String,String> point = path.get(j);
                double lat = Double.parseDouble(point.get("lat"));
                double lng = Double.parseDouble(point.get("lng"));
                position = new LatLng(lat, lng);
                points.add(position);
            }
            // Adding all the points in the route to LineOptions

             mMap.moveCamera(CameraUpdateFactory.newLatLng(position));
            mMap.animateCamera(CameraUpdateFactory.zoomTo(10));
            lineOptions.addAll(points);
            lineOptions.width(2);
            lineOptions.color(Color.RED);
        }
        // Drawing polyline in the Google Map for the i-th route
            mMap.addPolyline(lineOptions);
    }

Solution 3:

you can avoid crash by simply adding this line in protected void onPostExecute(List>> result) method

enter code here

if(points)!=null {
 mMap.addPolyline(lineOptions);
}

But because of error in your call to direction API it is returning null value to points. Check wether direction api is enabled correctly

Solution 4:

TRY THIS!!!

1. In any case you should add a check to see if polyLineOptions is null before using it

if (polyLineOptions != null){
     googleMap.addPolyline(polyLineOptions);
}

It will prevent from Crash

2. To make a route draw Add your API KEY at end of the getDirectionsUrl like,

String url = "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters +"&key=" +"YOUR KEY";