(Android - Google Maps) Why polyline automatically making a closed figure

Question

I've been developing a map based app. In that I'm showing bus routes with the help of Polylines. Everything works fine as you can see in this image:

But when I restart the app or revisit map activity, the polyline automatically connects the last and very first points (co-ordinates),thus making a closed figure.

So is there any way by which I can stop the map from doing this?

Source code for map fragment

public class MapFragment extends Fragment {

GoogleMap gmaps;
ArrayList<LatLng>coo = ProcessLatLng.getCoordinates(); //Getting co-ordinates into Array List

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    View v=inflater.inflate(R.layout.map_fragment, container, false);
    prepareMap();
    return v;
}

private void prepareMap() {
    int i;
    if(gmaps == null)
        gmaps = ((com.google.android.gms.maps.MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
    
    if(gmaps != null){
        PolylineOptions pop= new PolylineOptions();
        
        pop.width(5).color(Color.BLUE);
        
        for(i=0;i<coo.size();i++){
            pop.add(coo.get(i));
        }
                
        gmaps.addPolyline(pop);
        
        gmaps.addMarker(new MarkerOptions().position(coo.get(0)).title("Start"));
        gmaps.addMarker(new MarkerOptions().position(coo.get(coo.size()-1)).title("End"));
    
        gmaps.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(26.846785, 80.945591), 13));
    }
    
}

Answer 1

If i'm not wrong, seems like same points are being added again, like this

The first time

(P1) ---- (P2) ---- (P3)

Second time

(P1) ---- (P2) ---- (P3) ---- (P1) ---- (P2) ---- (P3)

Try moving ProcessLatLng.getCoordinates() method to prepareMap method

Try getting polyline instance, and remove before fragment gone

Polyline mPolyline;
private void prepareMap() {
    ....
    ArrayList<LatLng> coo = ProcessLatLng.getCoordinates();

    ....
    mPolyline = gmaps.addPolyline(pop)
}