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POHow to call populate() from mapOverlay
 

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  1. POHow to call populate() from mapOverlay
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    <p>I'm converting GeoPoints from a route to an overlay and inserting to the map, on the overlays list (using mapView.getOverlays()).</p> <p>On the first execution, everything went fine, but after, the map doesn't display the route overlay. After researching, I've remembered I have to call populate() to update the map overlays, but I don't know how to do that outside the ItemizedOverlay class.</p> <p>Someone could help me?</p> <p>Thanks in advance, Danniel.</p> <p>EDIT::</p> <p>Method which gets the route and parse the polyline into GeoPoints</p> <pre><code>public void drawRoute(Location from, double toLat, double toLon) { String url = RoadProvider.getUrl(from.getLatitude(), from.getLongitude(), toLat, toLon); Log.i("rotaUrl", url); JSONGet routeHttpObj = new JSONGet(mContext, url) { @SuppressWarnings("unchecked") @Override protected void jsonHandler(JSONObject routeJsonObj) { Log.i("Rota", "Rota recebida..."); try { // Qual o status da requisição da rota? String status = routeJsonObj.getString("status").toString(); // O webservice conseguiu traçar uma rota? if (status.equalsIgnoreCase("OK")) { Log.i("Rota", "Ok"); Log.i("overlay", mapOverlays.toString()); Log.i("overlay", mapOverlays.size()+""); // Remove a rota, caso exista if (mapOverlays.size() == 3) { mapOverlays.remove(2); } // Reseta o mapa itemizedOverlay.populateNow(); mapView.invalidate(); Log.i("overlay", mapOverlays.size()+""); // Extração da polyline codificada String polyline = routeJsonObj.getJSONArray("routes").getJSONObject(0).getJSONObject("overview_polyline").getString("points"); // Decodificação da polyline para um array de GeoPoints ArrayList&lt;GeoPoint&gt; route = RoadProvider.decodePolyline(polyline); // Instanciamento do objeto da rota RoadOverlay routeOverlay = new RoadOverlay(route); // Pega a lista de overlays e adiciona a rota ao mapview mapOverlays.add(routeOverlay); // Reseta o mapa itemizedOverlay.populateNow(); mapView.invalidate(); Log.i("overlay", mapOverlays.size()+""); Log.i("overlay", mapOverlays.toString()); // Pega os passos da rota /*JSONArray routeSteps = routeJsonObj.getJSONArray("routes").getJSONObject(0).getJSONObject("legs").getJSONArray("steps"); // Percorre os passos da rota e insere nos vetores, para guiar o motorista for (int i=0; i&lt;routeSteps.length(); i++) { // O objeto do passo no indice i JSONObject stepObj = routeSteps.getJSONObject(i); // Cria o array dos pontos GeoPoint[] arrPoints = new GeoPoint[2]; // Insere a latitude e longitude no array //arrPoints[0] = stepObj.getJSONObject(name) // Insere o array na lista routePoints.add(arrPoints); // routeInstructions }*/ // Copia os pontos para referencia futura routePoints = (ArrayList&lt;GeoPoint&gt;) route.clone(); } else { // Qual o erro? if (status.equalsIgnoreCase("NOT_FOUND")) { } else if (status.equalsIgnoreCase("ZERO_RESULTS")) { } else if (status.equalsIgnoreCase("MAX_WAYPOINTS_EXCEEDED")) { } else if (status.equalsIgnoreCase("INVALID_REQUEST")) { } else if (status.equalsIgnoreCase("OVER_QUERY_LIMIT") || status.equalsIgnoreCase("REQUEST_DENIED")) { } else { } } } catch (JSONException e) { e.printStackTrace(); } } }; // Desabilita a exibição do loading routeHttpObj.setDisplayDialog(false); // Executa a requisição routeHttpObj.execute(); } </code></pre> <p>Class which draws the route overlay</p> <pre><code>public class RoadOverlay extends Overlay { private ArrayList&lt;GeoPoint&gt; pointList; public RoadOverlay(ArrayList&lt;GeoPoint&gt; pointList) { this.pointList = pointList; } @Override public void draw(Canvas canvas, MapView mapView, boolean shadow) { Point current = new Point(); Path path = new Path(); Projection projection = mapView.getProjection(); Iterator&lt;GeoPoint&gt; iterator = pointList.iterator(); if (iterator.hasNext()) { projection.toPixels(iterator.next(), current); path.moveTo((float) current.x, (float) current.y); } else { return; } while(iterator.hasNext()) { projection.toPixels(iterator.next(), current); path.lineTo((float) current.x, (float) current.y); } Paint pathPaint = new Paint(); pathPaint.setAntiAlias(true); pathPaint.setStrokeWidth(8.0f); pathPaint.setColor(Color.argb(64, 0, 0, 255)); pathPaint.setStyle(Style.STROKE); canvas.drawPath(path, pathPaint); } } </code></pre>
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