ANDROID - Draw path from coordinates in KML

[gembaknb]

I have a KML coordinate set file. I want to draw a path between two location points in the KML overlay.

 @Override
    public void onMapReady(GoogleMap googleMap) {
      mMap = googleMap;
      KmlLayer layer = null;
      try {
        layer = new KmlLayer(mMap, R.raw.railways, getApplicationContext());
        layer.addLayerToMap();

        LatLng rail1 = new LatLng(6.814692, 79.866891);
        LatLng rail2 = new LatLng(6.774442, 79.881984);
        mMap.addMarker(new MarkerOptions().position(rail1));
        mMap.addMarker(new MarkerOptions().position(rail2));
        mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(rail2, 15));

        ////// code for drawing path between rail1 and rail2

      } catch (XmlPullParserException e) {
         e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      }

    }

Here, R.raw.railways contain my coordinates. And it has successfully import as a layer. Now I want to know how can I draw path line between rail1 and rail2 on the KML layer. No need to use google paths. As here, KML contain railway paths. so I need to draw on this railway path.

This is KML file; https://drive.google.com/open?id=1k0bu3VbxthF4snJQoE94qPgTZgfw59hi

 

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