Turning on/off GPS in J2ME on 6210 Navigator

[jankarlberg]

Dear collegues!

I am developing a MIDlet which uses (must use) GPS. I am using J2ME (JSR 179 Location API) on Nokia 6210 Navigator. I have 2 problems regarding turning on and off the GPS.

1. Turning off the GPS seems to be impossible. I use and have tried several combinations of:
locationProvider.setLocationListener( null,... );
locationProvider.reset();
locationProvider = null;

2. Turning on the GPS seems to be difficult with a call to
locationProvider.setLocationListener( this,... );
(this is an object implementing LocationListener)
The MIDlet or another MIDlet must use
locationProvider.getLocation() first to get
the GPS going.

When I say difficult I mean that it sometimes turns on, sometimes not.

Has anyone solutions on these problems or at least seen them?

(I think has something to do with threads inside LocationProvider)

Best regards, J

[ltomuta]

I'm not a Java expert, and since your question is related specifically to the Java APIs I think you should ask about them in the Java forum.

However, there should be no need for turning off the GPS device as such, disconnecting from the service provider should be enough and it will be the provider that turns the hardware off when it is no longer serving any clients.

As for acquiring the first fix, if that is the issue, that could be a rather lengthy process, depending of the characteristics of the location where you're running the tests.

[jesandbe]

Dear collegues!

1. Turning off the GPS seems to be impossible. I use and have tried several
Has anyone solutions on these problems or at least seen them?

(I think has something to do with threads inside LocationProvider)

Best regards, J

Note that the GPS is kept running for some time, after you request not to use it anymore. For your device it would be 30 seconds. Could you check this ?

Disconnect from the service provider, and wait more than 30 seconds.

Br, Jesper Sandberg.

[mckswk]

Hi

I've got the same problem with this mobile with turning off gps. For sure it's bug in implementation of Location API. Here is solution how to turn off gps:

If you got reference to LocationProvider object set it to null and invoke garbage collector:

LocationProvider lp = LocationProvider.getInstance(criteria);
...
...
lp = null;
Runtime.getRuntime().gc();


Hope it will save someone's time for looking for solution.


Regards,

Maciej