How to create direction arrows for my polylines in android

Question

what i need to add for

PolylineOptions polyline = new PolylineOptions();
polyline.addAll(geom);
polyline.color(defaultStrokeColor).width(defaultWidth);
mapO         


        

Answer 1

i found a solution , it is working for me

PolylineOptions polyline = new PolylineOptions();
polyline.addAll(geom);
polyline.color(defaultStrokeColor).width(defaultWidth);
mapObjects.add(polyline);
double lat1 = geom.get(0).latitude;
                    double lng1 = geom.get(0).longitude;

                    // destination
                    double lat2 = geom.get(1).latitude;
                    double lng2 = geom.get(1).longitude;

                    //midpoint 
                    double lat = (lat1 + lat2)/2;
                    double lng = (lng1 + lng2)/2;

                    double dLon = (lng2-lng1);
                    double y = Math.sin(dLon) * Math.cos(lat2);
                    double x = Math.cos(lat1)*Math.sin(lat2) - Math.sin(lat1)*Math.cos(lat2)*Math.cos(dLon);
                    double brng = Math.toDegrees((Math.atan2(y, x)));

and now add a marker(arrowhead bitmap) at end point

MarkerOptions marker = new MarkerOptions().position(geom.get(0));
                    marker.anchor(0.5f, 0.5f);
                    marker.icon(BitmapDescriptorFactory.fromBitmap(bstyle));
                    marker.rotation((float) brng);
                    marker.flat(true);