Are there any libraries for drawing routes on google maps? [closed]

To do this, do not need any. This is done using standard Google tools.

First you need to get a route. Use the Directions API for this.

In response, you will receive all the information on the route, including navigation. If you just need to draw a route, then we will be interested in the answer "routes" for getting route points and "bounds", to determine the region for scaling the map to show the route completely.

Example of parsing the answer and displaying the route on the map:

private GoogleMap map; ... final JSONObject json = new JSONObject(здесь ответ от Directions API); if(json.getString("status").equals("OK")) { JSONArray jsonRoutes = json.getJSONArray("routes"); JSONObject jsonRoute = jsonRoutes.getJSONObject(0); final String points = jsonRoute.getJSONObject("overview_polyline").getString("points"); final JSONObject jsonBounds = jsonRoute.getJSONObject("bounds"); final JSONObject jsonNortheast = jsonBounds.getJSONObject("northeast"); final JSONObject jsonSouthwest = jsonBounds.getJSONObject("southwest"); LatLngBounds.Builder builder = new LatLngBounds.Builder(); builder.include(new LatLng(jsonNortheast.getDouble("lat"), jsonNortheast.getDouble("lng"))); builder.include(new LatLng(jsonSouthwest.getDouble("lat"), jsonSouthwest.getDouble("lng"))); final LatLngBounds latLngBounds = builder.build(); PolylineOptions polylineOptions = new PolylineOptions(); polylineOptions.color(Color.BLACK); polylineOptions.width(getPixelsForDp(6 /* ширина линии в dp */, getResources())); polylineOptions.addAll(decodePolyLine(points)); // теперь можно рисовать маршрут на карте map.addPolyline(polylineOptions); CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngBounds(latLngBounds, getPixelsForDp(64 /* размер отступа от краев региона в dp (padding) */, getResources())); map.animateCamera(cameraUpdate); } else { // Гугл вернул ошибку new Throwable("Route Exception!"); } ... // переводит закодированную строку PolyLine в список координат private List<LatLng> decodePolyLine(final String poly) { int len = poly.length(); int index = 0; List<LatLng> decoded = new ArrayList<>(); int lat = 0; int lng = 0; while (index < len) { int b; int shift = 0; int result = 0; do { b = poly.charAt(index++) - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lat += dlat; shift = 0; result = 0; do { b = poly.charAt(index++) - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lng += dlng; decoded.add(new LatLng(lat / 100000d, lng / 100000d)); } return decoded; } ... // возвращает пиксельный размер для заданного dp private int getPixelsForDp(int sizeInDp, Resources resources) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, sizeInDp, resources.getDisplayMetrics()); }