Develop Reference

Android: GPS Location not working

I am trying to retrieve Location as follows:
LocationManager locationManager = (LocationManager)MyApp.getAppContext().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
// Getting the name of the provider that meets the criteria
String provider = locationManager.getBestProvider(criteria, false);
if(provider!=null && !provider.equals("")){
// NOTE: the location below is null !!
Location location = locationManager.getLastKnownLocation(provider);
String lat = location.getLatitude();
String lng = location.getLongitude();
}
The 'location' above is null. Why?
But when i open the (Google) Maps app - it shows location correctly, and even a notification icon (looks like a exclamation mark) shows up.
And there is a GPS Coordinates app - which also shows up blank.
I have turned on Settings > 'Location' on the phone. If it matters this is Android 4.4.4 Sony Experia phone.

Well, it seems that you're not checking properly if the GPS is working or not. The way you should do it:
final LocationManager manager = (LocationManager) getSystemService( Context.LOCATION_SERVICE );
if (!manager.isProviderEnabled( LocationManager.GPS_PROVIDER ) ) {
//GPS is not enabled !!
}
You can also create an AlertDialog so the user is aware that the GPS is not enabled and you can send him to the GPS settings by doing this:
startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
After this, I'd implement a location listener and get coordinates, here is an example, check it out
How do I get the current GPS location programmatically in Android?
UPDATE: They might be getting coordinates through other provider (usually the one which is working better at that moment). So if the GPS it not working, just try other provider, here is an example:
Location lastKnownLocation = null;
List<String> providers = null;
if(locationManager != null) providers = locationManager.getAllProviders();
if(providers != null)
{
for(int i=0; i<providers.size(); i++)
{
if(locationManager != null) lastKnownLocation = locationManager.getLastKnownLocation(providers.get(i));
if(lastKnownLocation != null)
{
position = new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude());
break;
}
}
}

What is the simplest way to get the user's longitude and latitude in Android ? Even without using listener?

My app just need to know user's country, and my app doesn't care where user moves.
All I want to know is :
When user start app, app will send user's approximately location(latitude and longitude) to server.
Here is my code with error. I try to send a string to getlocation function, and I hope it can return original string with adding latitude and longitude information.
private String getlocation (String url){
LocationManager status = (LocationManager) (this.getSystemService(Context.LOCATION_SERVICE));
if (status.isProviderEnabled(LocationManager.GPS_PROVIDER) || status.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
Log.v("print","enable to locate");
} else {
Log.v("print","fail to locate");
}
Location location = status.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if(location!=null){
Log.v("print","succed!!!##");
Double longitude = location.getLongitude();
String loc=Double.toString(longitude);
url=url+loc;
}
else{
Log.v("print","location return null");
}
return url;
}
I use network_provider, and it always print "enable to locate", then print "location return null"
So what's wrong with my code that my location always return null.
I use AVD manerger, and I also try GPS_PROVIDER. I use Emulator control to send Decimal on location control. It doesn't work ,too.
By the way, I set network and GPS permission,too.
So much thanks for help!

I am getting location by below code but enable " use wireless networks " in settings i.e ( through settings - Location services - use wireless networks)
public void getCurrentLocation() {
LocationManager locationManager;
String bestProvider;
// Get the location manager
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
bestProvider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(bestProvider);
Log.e(TAG, "Latitude: "+location.getLatitude()+" , Longitude: "+location.getLongitude());
}

Android Runtime GPS Location - Blackberry Device - not working

My app has been ported from Android to blackberry and it works fine...
the only thing not working is the GPS location which works on the android....
the app displays a message to the using that we are trying to find the location and if no location is found we tell the user that we could not retrieve a location..
here is the code
private void gpsLocation()
{
//Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//Provide Criteria
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
locationManager.requestLocationUpdates(provider, 400, 1, this);
if(location != null){
onLocationChanged(location);
} else{
Log.i(TAG, "no GPS location available - waiting for GPS fix");
Toast.makeText(getApplicationContext(), R.string.gpsWaitingToast, Toast.LENGTH_SHORT).show();
if (Debug.GPS_USE_MONTREAL) {
currentLatitude = Double.valueOf(Debug.GPS_LAT_MONTREAL); currentLongitude = Double.valueOf(Debug.GPS_LNG_MONTREAL); // montreal
}
waitForGpsFix(GPSFIX_DELAY);
}
its not working,, I restarted the app ,, did it next to a window and all that stuff..
nothing works..
your advise and help is greatly appreciated.
Regards

There was previously a bug where LocationManager.NETWORK_PROVIDER returned null, which may still be returned by the locationManager.getBestProvider() method. This should be fixed in the newer OS builds, however.
If you'd like to fix your code immediately, all you would need to do would be to set:
provider = LocationManager.GPS_PROVIDER
as in the early stages, GPS_PROVIDER was the only provider that was implemented in the player.

issues to get the Latitude using network and GPS provider

Hi I have implemented a location listener in my app which uses the Network Provider to get the GPS values. It's working fine, but now I want to get GPS using network provider and GPS provider. am trying but am getting the same value.
here my code
Location networkLoc = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
Location gpsLoc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Where i have to use networkLoc and gpsLoc?
#Override
public void onLocationChanged(Location location) {
double lat1 = (double) (location.getLatitude());//here i get the latitude value..how to know these values are from different provider
double lng1= (double) (location.getLongitude());
latituteField.setText(Double.toString(lat));
longitudeField.setText(Double.toString(lng));
}

It may be the case, that if the user has GPS Enabled your line
provider = locationManager.getBestProvider(criteria, false);
is returning LocationManager.GPS_PROVIDER already, so you just query getLastKnownLocation(provider) twice with the same Provider. Try this instead:
Location networkLoc = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
Location gpsLoc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
or if you really don't care which one to use
List<String> providers = locationManager.getProviders(false);
Location[] loc = new Location[providers.size];
int i = 0;
for (String provider: providers){
loc[i++] = locationManager.getLastKnownLocation(provider);
}
EDIT: due to refactoring of the question
//query provider from Location
public void onLocationChanged(Location loc){
String provider = loc.getProvider();
if (provider.equals(LocationManager.GPS_PROVIDER)){
//GPS Location
} else if (provider.equals(LocationManager.NETWORK_PROVIDER)){
//Network Location
}
....
}

problem in showing latitude longitude location in an android app

Following is the code which i am using to find the latitude longitude and location of a place in my app, but it always show no location found
I have added the permissions in manifest file
{
LocationManager locManager;
setContentView(R.layout.main);
locManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000L,500.0f, locationListener);
Location location = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(location != null)
{
String param = (String)locManager.getProviders(true).get(0);
Location loc = locManager.getLastKnownLocation(param);
double latitude = location.getLatitude();
double longitude = location.getLongitude();
}
}
private void updateWithNewLocation(Location location)
{
TextView myLocationText = (TextView)findViewById(R.id.widget52);
String latLongString = " ";
if (location != null)
{
double lat = location.getLatitude();
double lng = location.getLongitude();
latLongString = "Lat:" + lat + "\nLong:" + lng;
}
else
{
latLongString = "No location found";
}
myLocationText.setText("Your Current Position is:\n" +
latLongString);
}
private final LocationListener locationListener = new LocationListener()
{
public void onLocationChanged(Location location)
{
updateWithNewLocation(location);
}
public void onProviderDisabled(String provider)
{
updateWithNewLocation(null);
}
public void onProviderEnabled(String provider)
{
}
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
};
}
pls help me...

I've put your code in an Android project and ran it on the emulator and it seems to be working fine.
I would change the code to first check for a lastknown location, and after that check for location updates.
Location location = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
If that location is null, or too stale (timestamp) for your needs, you can start requesting location updates. (currently, you're first requesting location updates from the GPS, and then decide to retrieve its lastknownlocation). This might cause the location manager to stop querying the GPS.
Also you need to ensure the following is in place :
For GPS Provider, make sure the following permission is put in the manifest
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
Ensure the GPS is turned on that you have sufficient GPS coverage.
Do this by checking for the GPS icon in your Notification bar
Test on a real device
Although testing GPS location listeners works partly through the emulator, the behavior of an actual device will always be different.
Debug on the emulator
Basic GPS testing can be done using the emulator. Put a breakpoint in your locationlistener, and use the DDMS perspective to send some GPS coordinates to your AVD image.

#Siva, your problem is with the UI thread, as your updates are from different thread.
To verify if this is the UI problem, put a toast or Log cat the message when you receive an update.
Once you know that UI problem, then try using Handler to postInvalidate() the UI.