You are getting the null pointer b/c getLastKnownLocation has nothing to
give... In this case you would need to call up the GPS listener... When it
gets the current fix it will pop off its subroutine.. Inside there you can
get the lat/lon do what you need to do with your button click then kill the
GPS listener..
-Original Message-
From: android-developers@googlegroups.com
[mailto:android-developers@googlegroups.com] On Behalf Of Mark Murphy
Sent: Thursday, May 05, 2011 3:29 PM
To: android-developers@googlegroups.com
Subject: Re: [android-developers] Re: Android app crashes when invoking
getSystemService(LOCATION_SERVICE)
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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