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POhow to show location pin of the visible portion of a mapview in android?
 

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  1. POhow to show location pin of the visible portion of a mapview in android?
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    <p>Here is my <code>asynctask</code> part where I am putting pin in some location parsed from an xml. This is doing fine for a small location data set but takes a long time when the location data set is large.</p> <pre><code>private class MapLoader extends AsyncTask&lt;Void, Void, Void&gt; { ProgressDialog dialog; ArrayList&lt;POI&gt;[] mappoiList; @Override protected void onPreExecute() { mapOverlays = mapview.getOverlays(); dialog = new ProgressDialog(MainActivity.this); dialog.show(); } @Override protected Void doInBackground(Void... params) { // TODO Auto-generated method stub try { URL url = new URL(MainActivity.baseUrl + "latitude=40.9192799&amp;longitude=-74.0657508&amp;distance=20"); SAXParserFactory spf = SAXParserFactory.newInstance(); SAXParser sp = spf.newSAXParser(); XMLReader xr = sp.getXMLReader(); ParserHandler parserHandler = new ParserHandler(); xr.setContentHandler(parserHandler); xr.parse(new InputSource(url.openStream())); Log.d("Thread", url.toString()); basicItems = parserHandler.getBasicItems(); featuredItems = parserHandler.getFeaturedItems(); restaurants = parserHandler.getRestaurants(); mapvisibleList = new ArrayList&lt;POI&gt;(); mappoiList = new ArrayList[2]; mappoiList[0] = new ArrayList&lt;POI&gt;(); mappoiList[1] = new ArrayList&lt;POI&gt;(); for (int i = 0; i &lt; featuredItems.size(); i++) { POI poi = new POI(featuredItems.get(i), 1); mappoiList[0].add(poi); } for (int i = 0; i &lt; restaurants.size(); i++) { POI poi = new POI(restaurants.get(i), 2); mappoiList[0].add(poi); } for (int i = 0; i &lt; basicItems.size(); i++) { POI poi = new POI(basicItems.get(i), 0); mappoiList[1].add(poi); } for (int i = 0; i &lt; mappoiList[0].size(); i++) { if (mappoiList[0] != null) { mapvisibleList.add(mappoiList[0].get(i)); } } for (int i = 0; i &lt; mappoiList[1].size(); i++) { if (mappoiList[1] != null) { mapvisibleList.add(mappoiList[1].get(i)); } } for (FeaturedItem item : featuredItems) { Log.d("FEATURED", item.getName() + "Distance: " + item.getDistance()); } for (Restaurant item : restaurants) { Log.d("RESTAURANTS", item.getName() + "Distance: " + item.getDistance()); } for (BasicItem item : basicItems) { Log.d("BASIC", item.getName() + "Distance: " + item.getDistance()); } } catch (MalformedURLException e) { e.printStackTrace(); showErrorDialog("Error", "Malformed URL Error Occurred"); } catch (ParserConfigurationException e) { e.printStackTrace(); showErrorDialog("Error", "Parser Configuration Problem Occurred"); } catch (SAXException e) { e.printStackTrace(); showErrorDialog("Error", "SAX Parser Error Occurred"); } catch (IOException e) { e.printStackTrace(); showErrorDialog("Error", "IOException Occurred"); } catch (Exception e) { e.printStackTrace(); } GlobalData.gBasicItems = basicItems; GlobalData.gFeaturedItems = featuredItems; GlobalData.gRestaurants = restaurants; if (currentLocation != null) { int curLat = (int) (currentLocation.getLatitude() * 1e6); int curLon = (int) (currentLocation.getLongitude() * 1e6); GeoPoint gp = new GeoPoint(curLat, curLon); mapControl.animateTo(gp); mapControl.setZoom(14); OverlayItem item = new OverlayItem(gp, "My Location", "My Location"); itemizedOverlay1 = new MyItemizedOverlay(drawableFeature, MainActivity.this, mappoiList[0]); itemizedOverlay2 = new MyItemizedOverlay(drawableBasic, MainActivity.this, mappoiList[1]); itemizedOverlay3 = new MyItemizedOverlay(drawableCurrent, MainActivity.this, mappoiList[0]); Log.i("asyncbasic", "" + basicItems.size()); Log.i("asyncfeatured", "" + featuredItems.size()); Log.i("asyncres", "" + restaurants.size()); if (featuredItems != null) { int featuredLength = featuredItems.size(); for (int i = 0; i &lt; featuredLength; i++) { FeaturedItem fItem = featuredItems.get(i); int lat = (int) (Double .parseDouble(fItem.getLatitude()) * 1e6); int lon = (int) (Double.parseDouble(fItem .getLongitude()) * 1e6); OverlayItem oItem = new OverlayItem(new GeoPoint(lat, lon), fItem.getName(), "Feature"); itemizedOverlay1.addOverlay(oItem); Log.i("Map over lay", "Finished one featured"); } } if (basicItems != null) { int basicLength = basicItems.size(); for (int i = 0; i &lt; basicLength; i++) { BasicItem bItem = basicItems.get(i); int lat = (int) (Double .parseDouble(bItem.getLatitude()) * 1e6); int lon = (int) (Double.parseDouble(bItem .getLongitude()) * 1e6); OverlayItem oItem = new OverlayItem(new GeoPoint(lat, lon), bItem.getName(), "Basic"); itemizedOverlay2.addOverlay(oItem); Log.i("Map over lay", "Finished one Basic"); } } if (restaurants != null) { int resLength = restaurants.size(); for (int i = 0; i &lt; resLength; i++) { Restaurant res = restaurants.get(i); int lat = (int) (Double.parseDouble(res.getLatitude()) * 1e6); int lon = (int) (Double.parseDouble(res.getLongitude()) * 1e6); OverlayItem oItem = new OverlayItem(new GeoPoint(lat, lon), res.getName(), "Restaurant"); itemizedOverlay1.addOverlay(oItem); Log.i("Map over lay", "Finished one Restaurant"); } } itemizedOverlay3.addOverlay(item); } return null; } @Override protected void onPostExecute(Void result) { // TODO Auto-generated method stub mapOverlays.clear(); mapOverlays.add(itemizedOverlay1); mapOverlays.add(itemizedOverlay2); mapOverlays.add(itemizedOverlay3); mapview.postInvalidate(); dialog.dismiss(); } } </code></pre> <p>I learned about using <code>getLatitudeSpan</code> and <code>getLongitudeSpan</code> to get rid of this problem, but I am not too clear on where and how to use it in my async task. Any suggestions ?</p>
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      1. POhow to show location pin of the visible portion of a mapview in android?
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    1. COCan anybody help? I got no reason why anyone is not at least giving a single reply :(
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      1. USReyjohn
    2. COtry profiling your application to see where the time is being eaten up. And can you define 'large number'? I.e. is this 10 or 1000?
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      1. USChris Knight
    3. CO1) avoid using so many loops try to combine them. 2) Optimize your `ParserHandler` to return the data in final form (`ArrayList<POI>` and `new ArrayList[2]`) to avoid running the DataSets so many times!
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      1. USmadlymad
 

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