requestLocationUpdates() is asynchronous. It may take seconds or more
for the location to be determined, depending on the location provider
being used and the user's circumstances (e.g., is the user getting a
GPS signal?). You cannot simply call getLastKnownLocation()
immediately after calling requestLocationUpdates() and expect to get
any value.
Your whole premise (press a button, get a location) will only work if either:
1. You have location updates started early (e.g., onResume()), so by
the time the user presses the button, you probably have a fix, or
2. Pressing the button triggers the request for the location, and it
simply does not have an immediate effect, until the fix arrives
On Thu, May 5, 2011 at 3:23 PM, Prayag Pathak <prayag.d.pat...@gmail.com> wrote:
> Hi Mark,
>
> Thanks for the answer. But still its not working. I included the code
> segment that updates the code. But still not working.
> Following is the code :
>
> LocationManager lm = (LocationManager)
> getSystemService(Context.LOCATION_SERVICE);
> LocationListener ll = new mylocationlistener();
> lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
> ll);
> Location l =
> lm.getLastKnownLocation(lm.getProvider(LOCATION_SERVICE).getName());
> Log.w("LocationTracker", "The value of Location returned by
> getLastKnownLocation() is : " + l.toString());
> Log.d("Current Location", l.getLatitude() + "");
> Log.d("Current Location",l.getLongitude() + "");
> Toast.makeText(this, l.getLatitude() + "" +
> l.getLongitude(),Toast.LENGTH_LONG).show();
>
> Regards,
>
> Prayag
>
> On May 5, 2:20 pm, Prayag Pathak <prayag.d.pat...@gmail.com> wrote:
>> Hi guys,
>>
>> I am trying to get the latitude and longitude of the current location.
>> Let me clarify, I dont want to implement a listener that will create
>> an event when the location will be changed. I am trying to create an
>> app that will record the current location on a button click event.
>> Following is my code :
>>
>> hdLocMgr = (LocationManager)
>> getSystemService(Context.LOCATION_SERVICE);
>> Log.w("LocationTracker", "The Location Manager is :
>> "+hdLocMgr.toString());
>> hdLocProvider = hdLocMgr.getBestProvider(hdCrit, true);
>> location = hdLocMgr.getLastKnownLocation(hdLocProvider);
>> dlat = location.getLatitude();
>> dlon = location.getLongitude();
>> Log.w("LocationTracker", "The value of Latitude is :
>> "+dlat.toString());
>>
>> The code gives a RunTimeException (caused by NullPointerException as
>> stated in it).
>>
>> Kindly help me out in that.
>>
>> Regards,
>>
>> Prayag
>
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