There's a problem with Location... I'm using method to get latitude and longtitude. But my Location variable is null. So my coordinates are 0,0.
Can anybody help me,pls?
Here's code:
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
checkGPS = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
checkNetwork = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!checkGPS && !checkNetwork) {
Toast.makeText(mContext, R.string.no_service, Toast.LENGTH_SHORT).show();
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (checkNetwork) {
try {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
loc = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
if (loc != null) {
latitude = loc.getLatitude();
longitude = loc.getLongitude();
}
} catch (SecurityException e) {
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (checkGPS) {
if (loc == null) {
try {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
loc = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (loc != null) {
latitude = loc.getLatitude();
longitude = loc.getLongitude();
}
}
} catch (SecurityException e) {
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return loc;
}
loc is null anyway. When I'm compiling app, GPS and wifi are enabled on my phone.
Given that you're swallowing the SecurityExceptions, I'm guessing your app did not request permission to ACCESS_COARSE_LOCATION and ACCESS_FINE_LOCATION, needed for Network and GPS location, respectively.
I generally recommend against silently swallowing exceptions. These particular SecurityExceptions, you should have never needed to add a catch statement for them (that was your clue that something was wrong), b/c you should've called checkSelfPermission() before attempting to access the resource.
Related
I am working on google maps. I want to get the user location and show him on the map. I wrote a Locationlistener to get the user location.
public Location getUserLocation(){
try {
// getting GPS status
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
return null;
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,DISTANCE_CALC,TIME_UPDATE, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,DISTANCE_CALC,TIME_UPDATE, this);
Log.d("GPS", "GPS Enabled");
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
The getUserLocation() is one of the functions in the LocationListener that will return the user location with either the GPS or the network. I am calling this function from a fragment like this.
if (Build.VERSION.SDK_INT >= 23){
if (checkPermission()) {
location = locHandler.getUserLocation();
if(location!=null)
showTheMaps(location);
else
AlertBuilder(title,body);
}else {
requestPermission();
}
}else {
//The build is less than marshmellow so no need for permission
location = locHandler.getUserLocation();
try {
// double d = location.getLatitude();
showTheMaps(location);
}catch (NullPointerException e){
AlertBuilder(title, body);
}
}
public void showTheMaps(Location location){
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(),location.getLongitude()), DataModel.zoomlevel);
googleMap.animateCamera(cameraUpdate);
}
The AlertBuilder function will show an alert box with a button which upon click closes the app.
As you can see from the screenshot the GPS is enabled yet the location returned to me is null and the app closes after showing the alert dialog.
What could be the problem? why is the location returning null even after turning on the GPS?
Use
Location currentLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
Source: https://developer.android.com/training/location/retrieve-current.html
Another (deprecated) way is to set a OnMyLocationChangeListener to your map to get the location
mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
#Override
public void onMyLocationChange(Location location) {
// do something with location
}
});
More info: how to get current location in google map android
I want to get last location (With any way) without enabling location services on device , is this possible?
How should i do this?
there are three ways to find your location,refer this
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
GsmCellLocation cellLocation = (GsmCellLocation)telephonyManager.getCellLocation();
int cellid= cellLocation.getCid();
int celllac = cellLocation.getLac();
If you want to get location without GPS then you should use NETWORK_PROVIDER to get location :
I have taken this module from AndroidHive website You can refer more there.
Your query will be solved with this method getLocation()
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
You can use NETWORK_PROVIDER as service parameter in the method getLastKnownLocation.
hello,this is my code that I am used to get latitude,longitude and altitude.Longitude latitude getting properly but altitude return always zero.I could not understand how to get altitude.please check code and let me know.
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
if(!location.hasAltitude())
{
altitude=location.getAltitude();
}else
{
altitude=1.0;
}
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
if(!location.hasAltitude())
{
altitude=location.getAltitude();
}else
{
altitude=1.0;
}
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
You're calling getAltitude() only when hasAltitude() returns false (when no altitude data is available and therefore 0.0 is returned).
that depends of the gps receiver installed on your phone. If the vendor implements some sort on not standard nmea implementation, is possible that not all the information are available. You can check if the chipset does support altitude through the sdk. Here the documentation
This code:
ServiceListener mlistener = new SosServiceListener(getApplicationContext());
manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
manager.requestSingleUpdate(LocationManager.GPS_PROVIDER, mlistener, null);
manager.requestSingleUpdate(LocationManager.NETWORK_PROVIDER, mlistener, null);
Attach a listener once to two events. The fact is: if both events are triggered, the listener is called twice? If yes, how would you prevent it?
Thanks!
This is what I used for one of my projects and is perfectly working:
public Location getLocation() {
try {
mLocationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
// getting GPS status
boolean isGPSEnabled = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
boolean isNetworkEnabled = mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
// First get location from Network Provider
if (isNetworkEnabled) {
mLocationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (mLocationManager != null) {
location = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
lat = location.getLatitude();
lng = location.getLongitude();
}
}
}
//get the location by gps
if (isGPSEnabled) {
if (location == null) {
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (mLocationManager != null) {location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
lat = location.getLatitude();
lng = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
If you can assume that devices will be running on device with Google Play installed - much better way is to use this service: https://developer.android.com/training/location/retrieve-current.html
in my app I am able to use the GPS but the problem is that it always getting me the same location. Everytime I am retrieving the location from that on, it gives me the same value. First time it was fetched and I was online, wirelessly. Then i went out with only the GPS and even if I was a mile away location was the same. I enabled 3g and still the same.
I send my app to a friend of mine, he got a different first time location and then he sees the same no matter where he goes.
Here is my code:
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled) {
// System.out.println("Network enabled");
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
// System.out.println("GPS enabled");
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
#Override
public void onLocationChanged(Location location) {
// mAct.playToastMessage("Location Changed");
getLocation();
// mAct.setGPSText(location.getLatitude(),location.getLongitude());
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
In this For the parameter of MIN_TIME_BW_UPDATES and MIN_DISTANCE_CHANGE_FOR_UPDATES you have to set the 0 and 0. If it is set to 0,0. It will give you the location update as quick as possible. If you set larger value for the you never get the updated value until your condition satisfied. I hope this could solves your problem.
#Override
public void onLocationChanged(Location loc)
{
loc.getLatitude();
loc.getLongitude();
String Text = “My current location is: “ +
“Latitude = “ + loc.getLatitude() +
“Longitude = “ + loc.getLongitude();
Toast.makeText( getApplicationContext(),Text,Toast.LENGTH_SHORT).show();
}
Source : Tutorial on GPS to get Current Location.