Widget build(BuildContext context) {
    return FlutterMap(
      options: new MapOptions(
        plugins: [
          TappablePolylineMapPlugin(),
        ],
      ),
      layers: [
        TileLayerOptions(
          urlTemplate: 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
          subdomains: ['a', 'b', 'c'],
        ),
        TappablePolylineLayerOptions(
          polylines: [
            TaggedPolyline(
              tag: "My Polyline", // An optional tag to distinguish polylines in callback
              // ...all other Polyline options
            ),
          ],
          onTap: (TaggedPolyline polyline) => print(polyline.tag))
      ],
    );
  }