getSpeed() method in Location api not working

[Larry101]

I'm trying to use the getSpeed() method in the location API. However, the only value I ever get returned is "NaN". According to the JavaDocs, this is returned when speed cannot be calculated. At first I thought this was because I was moving too slowly, but this has since proven to be incorrect, as I get NaN returned no matter what speed I'm moving at. Has anybody ever successfully used this method, or do i have to calculate the speed myself?

Btw, the phone I'm using this on is the Nokia N95. All the other methods, like latitude and longitude work, just not speed.

[hekkoe]

Yes, I've noticed the same behaviour: Location.getSpeed() always returns NaN on the N95.

[juarezjunior]

Hi Larry101,

It seems you have the right answer as it cannot be calculated.

"Returns:
the current ground speed in m/s for the terminal or Float.NaN if the speed is not known"

Br,

[Larry101]

eventually got back to working on this the other day, and realised i was just being monumentally stupid. You have to specify that you want to be able to calculate the speed and course because this isn't the default. It works fine now that I fixed that. The criteria object sent through to LocationProvider.getInstance needs to have the correct settings.

[juarezjunior]

Hi Larry101,

Yes, of course, the Criteria object is meant to be used as the configurator regarding the information you want to retrieve.

However, check the Javadocs for setSpeedAndCourseRequired() method. It says:

Sets whether the location provider should be able to determine speed and course. Default is false.

It is not always true that your provider will be able to do so, it should be able to do so (Java specs always diferentiate should, must and may) as you might know.

Br,

[camicase82]

I all ready tryed with different configuracions..and when i add something to Criteria configuration like setSpeedAndCourseRequired(true); or similar...it keeps crashing....ani ideas?!

[ingsaurabh]

try dis

Criteria cr= new Criteria();
            cr.setCostAllowed(true);
            cr.setPreferredPowerConsumption(Criteria.NO_REQUIREMENT);
            cr.setVerticalAccuracy(5000);
            cr.setHorizontalAccuracy(5000);
            cr.setSpeedAndCourseRequired(true);
            lp= LocationProvider.getInstance(cr);
            lp.setLocationListener(this, -1, 0, -1); 

nd I dont know about others bt api method to get speed never returns correct speed its better to fetch the whole NMEA string and parse the value that are required form it