Develop Reference

Android Gps issue

The following code works on some devices but it does not work other devices. If I check the gps setting the gps is on and provides a mock location. My manifest file also as the following permissions:
// Getting LocationManager object
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
// Creating an empty criteria object
Criteria criteria = new Criteria();
// Getting the name of the provider that meets the criteria
provider = locationManager.getBestProvider(criteria, false);
if(provider!=null && !provider.equals("")){
// Get the location from the given provider
Location location = locationManager.getLastKnownLocation(provider);
locationManager.requestLocationUpdates(provider, 20000, 1, this);
if(location!=null)
onLocationChanged(location);
else
Toast.makeText(getBaseContext(), "Location can't be retrieved", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(getBaseContext(), "No Provider Found", Toast.LENGTH_SHORT).show();
}

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;
}
}
}

Gps is not working after restart my mobile

i am developing an application , in that i need to find current location values. For that, i enabled gps programmatically. now, i switched off and switched on my mobile. Now, i unable to get current location values but my device's gps is turned on.
i found this problem in (motorola 2.3.3 ,htc 2.3.4, and nexus 4.2.1)
i used the following code.
String provider = Settings.Secure.getString(getContentResolver(),Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if(!provider.contains("gps")){ //if gps is disabled
final Intent poke = new Intent();
poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
locationManager = (LocationManager) getSystemService (Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
List<String> provider = locationManager.getProviders(true);
Location location = null;
for (int i=provider.size()-1; i>=0; i--)
{
location = locationManager.getLastKnownLocation(provider.get(i));
if (location != null) break;
if (location != null)
{
String latitude=String.valueOf(location.getLatitude());
String longitude=String.valueOf(location.getLongitude());
}

after turning on GPS you must call requestLocationUpdate so that GPS starts sensing.
Hope This may help.

Android google maps use GPS location NOT network

In my application I want to get the location of the user and show it on a map (google maps).
In the settings of a android device you can check
Use Wireless networks
Use GPS satellites
When the user starts the mapactivity I show a dialog in wich the user can choose to get his current location or not.
Old code deleted
If the user wants to get his location I check if the gps is enabled. If not, I start the settings. Else I try to get the location. But even when GPS is active and "use wireless networks" not he won't get a location. Is there a solution to check if "Use wireless networks" is enabled. Or what part of my code I need to change to get location only by GPS signal?
Thanks
EDIT mycurrentcode:
boolean isGps = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean isNetwork = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(!isGps && !isNetwork){
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
} else if(isGps && !isNetwork) {
String bestProvider = LocationManager.GPS_PROVIDER;
Location location = lm.getLastKnownLocation(bestProvider);
Toast.makeText(MapsTabActivitiy.this, "Location niet beschikbaar.", Toast.LENGTH_SHORT).show();
} else if(!isGps && isNetwork) {
String bestProvider = LocationManager.NETWORK_PROVIDER;
Location location = lm.getLastKnownLocation(bestProvider);
if(location == null){
location = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
} else if (location != null){
mapcontroller.animateTo(new GeoPoint((int)(location.getLatitude()*1E6), (int)(location.getLongitude()*1E6)));
mapcontroller.setZoom(15);
}
}
else {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
String bestProvider = lm.getBestProvider(criteria, false);
Location location = lm.getLastKnownLocation(bestProvider);
if(location == null){
location = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
} else if (location != null){
mapcontroller.animateTo(new GeoPoint((int)(location.getLatitude()*1E6), (int)(location.getLongitude()*1E6)));
mapcontroller.setZoom(15);
}
}
So I check with isProviderEnabled for GPS_PROVIDER AND NETWORK_PROVIDER. And with the if, else if I change how to get the location. The only case I need to find is case 2 (else if(isGps && !isNetwork){}). Get the location by GPS signal.

You're getting the right provider using the Criteria class, but you can simple use the LocationManager.GPS_PROVIDER to request the location updates using only GPS. Change
String bestProvider = lm.getBestProvider(criteria, false);
to
String bestProvider = LocationManager.GPS_PROVIDER;
Hope this helps.

criteria for both GPS and network

I would like to know how can I get location from the best provider
do I have to make two separate criteria 1 for the GPS and 1 for the network or is there a way to put them all together ?
this is my code when I add the COARSE criteria the GPS does not go on (no GPS flashing logo on the top of the screen) and when I use the FINE criteria I dont get any thing from the network.......so do I have to write criteria for both and switch between them for what ever is available or can they both be in the same criteria ?
because I have the "getBestProvider(criteria, true);" in my code so it should get the location from the best provider....right..??!
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
//// criteria.setAccuracy(Criteria.ACCURACY_COARSE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_HIGH);
String provider = locationManager.getBestProvider(criteria, true);

Using a getBestProvider with Criteria.ACCURACY_FINE will never return the NETWORK_PROVIDER, even though wifi position is usually quite accurate.
In my application, I use getProviders to get all providers matching my criteria, then add the NETWORK_PROVIDER if it is activated and not yet in the list.
Then I launch a requestLocationUpdates for each of these providers, making sure to call removeUpdates when I get a location accurate enough.
This way, if the location provided by the network is accurate enough, the gps provider will be turned off

#nicopico getBestProvider with Criteria.ACCURACY_FINE can return the NETWORK_PROVIDER if gps is not enabled
i use the following code in my app
public void getLocation() {
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(context);
// boolean network_enabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
// Showing status
if (status != ConnectionResult.SUCCESS) { // Google Play Services are not available
Log.e(TAG, "getLocation fired Google Play Services are not available");
mHandler.post(new UiToastCommunicaton(context.getApplicationContext(),
context.getResources().getString(R.string.gpserv_notfound)));
}
// Getting LocationManager object from System Service LOCATION_SERVICE
locationManager = (LocationManager) context.getSystemService(IntentService.LOCATION_SERVICE);
if (!locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {//check if network location provider context on
Log.e(TAG, "network location provider not enabled");
} else {
criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
//criteria.setPowerRequirement(Criteria.POWER_LOW);
// Getting the name of the best provider
provider = locationManager.getBestProvider(criteria, true);
// Check provider exists then request for location
if (provider != null) {
requestLocation(locationManager, provider);
} else {
//start wifi, gps, or tell user to do so
}
}
}
public void requestLocation(LocationManager locationManager, String provider) {
Log.e(TAG, "requestLocation fired getting location now");
if (provider != null) {
locationManager.requestLocationUpdates(provider, 0, 0, this);
//locationManager.requestLocationUpdates(provider, 0, 0, this, Looper.getMainLooper());
} else {
//tell user what has happened
}
}
this code is in a class that implements locationListener
you can edit this line
locationManager.requestLocationUpdates(provider, 0, 0, this);
to reflect your implementation of locationListener