NullpointerException in LocationProvider Listenerthread

Ive been hunting around the forum for some time for a solution to this problem but have no luck... Ive has developed an application that needs to monitor gps... positioning using the obvious locationprovider with independent criteria I do work... for the first 5 minutes at least... my debugging code shows me that the location is updated with the provider (added locationlistener) regularly and without any hickups... However after about 5 minutes or more (and yes it is compatible) I get a nullpointer exception... the use of the debugger in eclipse, it shows which is comes from LocationProvider ListenerThread.run line 644... Obviously I don't see what he does so that is where the headaches come... Here is my code (although not very complicated) that I use to make it all work... any input is useful, but ill keep working on it... If I'm missing something obvious please feel free to point me in the right direction (or link by the way) thank you...

public class GPS implements LocationListener {
    private LocationProvider provider;
    private Location location;
    private WhereAreYouMainScreen mainscreen;

    public GPS(Criteria criteria,WhereAreYouMainScreen main) throws LocationException
    {
        this.provider=LocationProvider.getInstance(criteria);
        this.provider.setLocationListener(this, -1, -1, -1);
        this.mainscreen=main;

    }
    public Location getLocation(RichTextField rich)
    {
        return this.location;
    }
    public void locationUpdated(LocationProvider provider, Location location) {
        System.out.println("Location updated new location: "+location.getQualifiedCoordinates().getLatitude()+" "+location.getQualifiedCoordinates().getLongitude());
        this.mainscreen.LocationUpdated(location);
        this.location=location;

    }
    public void providerStateChanged(LocationProvider provider, int newState) {
        System.out.println("Provider state changed");

    }

OK, so I think that Ive solved the problem... I tried to use if(location!=null), but kept program hooked to this place... looking through the class location, I found isvalid()... it seems to work but I can't explain why the provider would say it is avaailable I check the supplier State to inside the locationUpdated() method and the provider is always avaiable... Here is my code if n e one encounters this problem, I hope this helps...

public void locationUpdated(LocationProvider provider, Location location) {
        System.out.println("LOcation updated check validity");

        if(location.isValid())
        {
            System.out.println("New Valid Location: "+location.getQualifiedCoordinates().getLatitude()+" "+location.getQualifiedCoordinates().getLongitude());
        this.mainscreen.LocationUpdated(location);
        return;

        }
        System.out.println("Error Location was NULL");
        int i=provider.getState();
        if(i==LocationProvider.AVAILABLE)
        {
            System.out.println("Weird provider was avaialable");
        }
        if(i==LocationProvider.OUT_OF_SERVICE)
        {
            System.out.println("Provider out of servcie");
        }
        if(i==LocationProvider.TEMPORARILY_UNAVAILABLE)
        {
            System.out.println("Provider temp unavailable");
        }

    }

Tags: BlackBerry Developers

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