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PODynamic Overlays slowing down Google Maps (Android 2.1) on Nexus One
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  1. PODynamic Overlays slowing down Google Maps (Android 2.1) on Nexus One
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    copied!<p>I'm trying to create a dynamic <code>ItemizedOverylay</code> (please see the code below) on Google Maps (Android 2.1) on a Nexus One. </p> <p>In my <code>Activity</code> (that extends MapActivity) I'm creating a data thread that is receiving data from the network. A 'handler' is used to communicate the data from the receiving thread to map activity. This data contains the locations (lat, lon) of the markers that I want to overlay on my map. The location of each marker is dynamic (i.e., it changes every time I receive new data from the network.) <code>refreshItems(ArrayList&lt;OverlayItem&gt; newItems)</code> method in invoked inside the <code>handleMessage()</code> of the handler. There are around 11 markers in the ArrayList that is passed to <code>refreshItems</code></p> <p>I can see the markers overlayed on the map. However, I've two issues:</p> <ol> <li><p>The old markers are not removed from the map. After a while I see a trail of markers. </p></li> <li><p>The map doesn't respond to any touch commands. I cannot move the map or zoom in or zoom out. After a while I see a system warning that my app is not responding (wait/close?) message. </p></li> </ol> <p>Any idea what's wrong here ? </p> <p>Thanks. </p> <pre><code> public class MyItemizedOverlay extends ItemizedOverlay&lt;OverlayItem&gt; { private ArrayList&lt;OverlayItem&gt; overlayItems; public CoTItemizedOverlay(Drawable defaultMarker) { super(boundCenter(defaultMarker)); overlayItems = new ArrayList&lt;OverlayItem&gt;(); populate(); } public void addNewItem(GeoPoint location, String markerText, String snippet) { overlayItems.add(new OverlayItem(location, markerText, snippet)); populate(); } public void removeItem(int index) { overlayItems.remove(index); populate(); } public void refreshItems(ArrayList&lt;OverlayItem&gt; newItems) { // remove all existing items for (int i = 0; i &lt; cotoverlayItems.size(); i++) { overlayItems.remove(i); } // copy all the items if (newItems != null &amp;&amp; cotoverlayItems.size() == 0) { overlayItems.addAll(newItems); } populate(); } @Override protected OverlayItem createItem(int index) { return overlayItems.get(index); } @Override public int size() { return overlayItems.size(); } </code></pre> <p>}</p>
 

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