I would say you might need to do updates to the MapView with a
Handler, but I would have expected you to get an exception otherwise
and it doesn't sound like you are. Still, might be worth a try.
On Apr 10, 7:10 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> Hi All,
>
> One of the methods in my Android App is named locationSubmit().
> It:
> -- obtains gps coords,
> -- sends the coords to a (Tomcat) server with a web services call,
> -- receives back a collection of points in the return from the
> server,
> -- plots these points on a map, with a recentering of the map
>
> This all works fine when I drive it with clicks from the keyboard (I
> happen
> to use Z) -- I can see the appropriate updates to the points with each
> Z click.
>
> However, I now want to run locationSubmit() periodically under the
> control
> of a TimerTask. When I do, the mapping process appears to freeze
> although
> everything else seems to keep going. Here is the simple timer task
> and
> startup (I run it with samplingPeriod=15000; ie, 15 seconds):
>
> private void startTimer(long samplingPeriod)
> {
> _lbsTimer = new Timer(false);
> _lbsTimer.schedule(new LBSUpdateTask(), new Date(),
> samplingPeriod);
>
> }
>
> protected class LBSUpdateTask extends TimerTask
> {
> protected LBSUpdateTask() { }
> public void run()
> {
> locationSubmit();
> }
>
> }
>
> The first execution of locationSubmit() under timer control almost
> works
> correctly: The points are plotted, but the map is not recentered.
> And from this point on, the map does not change at all, while the
> timer
> keeps functioning. However, from observing the server,
> I can see that the correct calls are arriving at the
> server from the Android client, and the correct returns are being sent
> back.
> Also, if I run my Android app under the debugger, I can see that it
> is receiving the values from the server, and stepping through the code
> as exepected, but
> not updating the overlay like it does when I drive it with keyboard
> clicks.
>
> The basic outline of locationSubmit() is this:
>
> private void locationSubmit()
> {
> try{
> URL url = new URL(getNextLocnURL());
> URLConnection urlconn = url.openConnection();
> ....
> Document doc = null;
> try{
> DocumentBuilderFactory dbf =
> DocumentBuilderFactory.newInstance();
> DocumentBuilder db = dbf.newDocumentBuilder();
> urlconn.getInputStream();
> InputStream istream = urlconn.getInputStream();
> doc = db.parse(istream);
> // extract info from doc and add it to an instance
> variable
> // visible to _mapView below:
> _mapView.invalidate();
> } catch (Exception e){ }
>
> }
>
> The value of MapView _mapView is set in onCreate to _mapView = new
> MapView(this);
> There is a simple class MyAppOverlay which extends Overlay, and plots
> the
> points using draw(...) when _mapView is invalidated.
>
> Have I missed something here?
> Thanks in advance,
> Ken Bowen
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