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
}
....
}
Related
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
t= (TextView)findViewById(R.id.textView);
s.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String locationProvider = LocationManager.NETWORK_PROVIDER;
Location lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
double lat = lastKnownLocation.getLatitude();
double lon = lastKnownLocation.getLongitude();
t.setText(""+lat+""+lon);
}
});
This is my code and I'm trying to get approximate location of user. But i don't know why i'm getting null object reference exception. Is this the right way of doing? can anyone help me with getting user location with network? Should I add request location updates method to get last known location?
I have a simple location manager that normally works, however when the Android device has been turned off and then turned back on, the android location manager returns Null even when I have it requesting updates. I am aware that getLastKnownLocation can return null, however I believe I am handling that in my code. All suggestions Appreciated.
Apparently lon = location.getLongitude(); is crashing it.
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null)
{
// request location update!!
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
lon = location.getLongitude();
lat = location.getLatitude();
}
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//Get last known location
location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//Update if not null
if (location != null)
{
lat = location.getLatitude();
lon = location.getLongitude();
}
//Request update as location manager can return null otherwise
else
{
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
lat = location.getLatitude();
lon = location.getLongitude();
}
}
the android location manager returns Null even when I have it requesting updates
Correct. Requesting updates requests that Android start trying to find out where the device is. That will take a while. In the meantime, getLastKnownLocation() can very well return null.
getLastKnownLocation() is generally only useful if you would like to know the location, but if that data is not ready, you can move on without it. If you need the location, and getLastKnownLocation() returns null, you will to wait to use the Location until onLocationChanged() is called. Note that onLocationChanged() may never be called, as there is no requirement that the user have any location providers enabled, and there is no requirement that the device be in a position to actually get location fixes.
I saw your reply on the airplane mode but you do however have bad practices in your code.
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null)
{
// request location update!!
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
lon = location.getLongitude();
lat = location.getLatitude();
}
you already saw here that location in null, that means that you can't access the inner properties such as latitude and longitude. In any case, location requests are asynchronous and it takes a short amount of time for them to start.
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//Get last known location
location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//Update if not null
if (location != null)
{
lat = location.getLatitude();
lon = location.getLongitude();
}
//Request update as location manager can return null otherwise
else
{
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
lat = location.getLatitude();
lon = location.getLongitude();
}
}
Even here, in the "else" clouse, you can't access the location right away. that means that you can't immediately get the location (it will just hold the last value).
What you should do is implement the onLocationChanges method and hadle the location there in asynchronous way. like this:
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null)
{
lat = location.getLatitude();
lon = location.getLongitude();
}
else
{
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
}
}
#Override
public void onLocationChanged(Location location) {
lat = location.getLatitude();
lon = location.getLongitude();
}
The only problem was that I had airplane mode enabled on the Android Phone. I'm a bit embarrassed now!
I want to fetch user's current city name in my Android application but as per some of my research (this, this, and this) it is a pretty complicated task and require switching between network providers and fetch location updates after some time.
My application is not some location-based app to require an accurate and up-to-date location of a user using the app. I just need a city name from NETWORK_PROVIDER (or any other provider for that matter) but if it is unable to fetch the city name, that's fine, too. It's just one feature in the application and doesn't matter if it fails to fetch the city name in some cases.
I'm using following code but it always shows both latitude and longitude to be 0.0.
Location location = new Location(LocationManager.NETWORK_PROVIDER);
Geocoder geocoder = new Geocoder(context, Locale.getDefault());
try {
Log.d("Lat-Lng", location.getLatitude()+","+location.getLongitude());
// Doesn't really return anything as both latitude and longitude is 0.0.
List<Address> address = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
} catch(Exception e) {
}
Well all you are doing here is creating a new Location object whose initial values for latitude and longitude are zero by default.
What you need to do is connect that location to the GPS information of the user.
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location From GPS
Location location = locationManager.getLastKnownLocation(provider);
if(location != null) {
Log.d("Lat-Lng", location.getLatitude()+","+location.getLongitude());
getUserGeoInfo(location.getLatitude(), location.getLongitude());
}
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
Log.d("Lat-Lng", location.getLatitude()+","+location.getLongitude());
getUserGeoInfo(location.getLatitude(), location.getLongitude());
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Set how often you want to request location updates and where you want to receive them
locationManager.requestLocationUpdates(provider, 20000, 0, locationListener);
// ...
void getUserGeoInfo(double lat, double lon) {
Geocoder geoCoder = new Geocoder(context, Locale.getDefault());
if (Geocoder.isPresent()) {
List<Address> addresses = geoCoder.getFromLocation(lat, lon, 1);
if (addresses.size() > 0) {
// obtain all information from addresses.get(0)
}
}
}
The LocationListener interface can, for example, also be implemented by the Activity that holds this code and then you would only pass that activity's context as the third parameter in locationManager.requestLocationUpdates(provider, 20000, 0, context);. Of course, as with any interface implementation, you will have to override all the methods same way as in above code.
As far as the requestLocationUpdates() method, you can read more about it here
As far as general techniques for obtaining user location on Android, this is a definite read
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());
}
I have a problem in getting the user's location (my location). My code is
double lat;
double lng;
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager)getSystemService(context);
String provider = LocationManager.GPS_PROVIDER;
Location location = locationManager.getLastKnownLocation(provider);
if(!locationManager.isProviderEnabled(provider)){
locationManager.setTestProviderEnabled(provider, true);
}
boolean enabled = locationManager.isProviderEnabled(provider);
if(enabled){
Toast.makeText(LoginActivity.this,"provider enabled",Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(LoginActivity.this,"provider disabled",Toast.LENGTH_LONG).show();
}
if(location!=null){
lat = location.getLatitude();
lng = location.getLongitude();
AlertDialog.Builder ab=new AlertDialog.Builder(LoginActivity.this);
ab.setMessage(Html.fromHtml("<b><font color=#ff0000>Location" +"</font></b><br>"
+location.toString()+"<br>Latitude: "+lat
+"<br>Longitude "+lng));
ab.setPositiveButton("ok",null );
Toast.makeText(LoginActivity.this,"You are at "+location.toString(),Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(LoginActivity.this,"Location not found",Toast.LENGTH_LONG).show();
}
My problem is I am getting the location as null while the application message provider is enabled. I have not found any problem in this code. I have also tested it on a device, it shows the provider is enabled and the location isn't found.
I have not implemented the location listener in the class.
Is it necessary to implement location listener in my class?
You are only getting the last known location from the phone. If this is null, which it is if no last known location is available, you are not trying to receive locations in any other way.
You should implement a LocationListener an register it to receive location updates according to this guide: http://developer.android.com/guide/topics/location/obtaining-user-location.html This will cause the phone to try to get the users location and hand it over to your application in the form of a Location object.