Refresh Thread, Redrawing Overlays

[MrLondon]

So I have a fully functional mapview activity I currently use a refresh button call the method below to redraw overlays based on coordinates which works fine. I would like to be able to auto-refresh it using a thread. By auto-refresh, I would like to redraw my overlays by calling the method below every x amount of seconds from a thread.

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Using java Syntax Highlighting

1.  
2. private void addOverlaysToMap() {
3.  
4.                 final List<Overlay> overlays = mapView.getOverlays();
5.  
6.                 overlays.clear();
7.  
8.                 normalItems.clear();
9.  
10.                 warningItems.clear();
11.  
12.                 overlays.add(myLocationOverlay);
13.  
14.  
15.  
16.                 Cursor cursor = getContentResolver().query(Tracker.Locations.CONTENT_URI,
17.  
18.                         new String[]{Tracker.Locations._FID, Tracker.Locations.LOCATION, Tracker.Locations.UPDATE_TIME},
19.  
20.                         null, null, null);
21.  
22.                 if (cursor.getCount() > 0) {
23.  
24.         // builds all the overlay  items
25.  
26.         // convert to overlays
27.  
28.                     convertGPRMCToOverlayItems(cursor);
29.  
30.                 }
31.  
32.                 cursor.close();
33.  
34.                 if (warningItems.size() > 0) {
35.  
36.                     overlays.add(warningItems);
37.  
38.                 }
39.  
40.                 if (normalItems.size() > 0) {
41.  
42.                     overlays.add(normalItems);
43.  
44.                 }
45.  
46.             }
47.  
48.  

Parsed in 0.033 seconds, using GeSHi 1.0.8.4

Because I am receiving coordinates it is essential to refresh every x amount of seconds. When I create a separate class for the refresh thread everything works fine but it randomly crashes with an uncaught exception.

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Using java Syntax Highlighting

1.  
2.  
3.  
4.      class refreshTicker implements Runnable{
5.  
6.           public void run() {
7.  
8.                while(!Thread.currentThread().isInterrupted()){
9.  
10.                          DisplayLoc.this.addOverlaysToMap();
11.  
12.                     try {
13.  
14.                          Thread.sleep(3000);
15.  
16.                     } catch (InterruptedException e) {
17.  
18.                          Thread.currentThread().interrupt();
19.  
20.                     }
21.  
22.                }
23.  
24.           }
25.  
26.     }
27.  
28.  

Parsed in 0.032 seconds, using GeSHi 1.0.8.4

Any suggestions?

[MrLondon]

Anyone???

[gostyloj]

This is what I would do:

Set up a Handler to handle a message. I don't think this is technically a Thread, but it will work the same way.

overlayRefreshHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case REFRESH:
DisplayLoc.this.addOverlaysToMap();
break;
}
};

Then set up your message on a timer:
Message msg = new Message();
msg.what = REFRESH;
overlayRefreshHandler.sendMessageDelayed(msg, 3000);


If you have some experience in Map overlays would you mind looking at my recent issue post:
http://www.anddev.org/memory_leak_in_ma ... 10244.html