Develop Reference

how to get the position of user by GPS and if not availabe by Network

I am new in android developing, and so intrested in getting location of users!!!!!
You may know that we can access users location by two types:
GPS (ACCESS_FINE_LOCATON)
Network based (ACCESS_COARSE_LOCATION)
My Question is:
I Want to get the location(latittude & longitude) of user by GPS. But, if the user has turned GPS Off/GPS isn't supported, then i want to get user's location by Network, or, Network-based location
.
Hope you understood my question....
Any help is accepted

Try the following code:
LocationManager mlocManager;
mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mlocListener = new MyLocationListener();
//if condition to check if GPS is available
if (mlocManager .isProviderEnabled(LocationManager.GPS_PROVIDER)) { mlocManager.requestSingleUpdate(LocationManager.GPS_PROVIDER,
mlocListener, null);
}
else if (mlocManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
mlocManager.requestSingleUpdate(
LocationManager.NETWORK_PROVIDER, mlocListener, null);
}
//this is the class to get the location.
public class MyLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
try {
//you may store these values where ever required.
Double latitude = location.getLatitude();
Double longitude = location.getLongitude();
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
}

When you use the FusedLocationProviderApi as used in the getting the last known location training and receiving location updates training, it will automatically fall back to network location if GPS is not available.

Hope get GPS code helps you.
if (Common.getIsGPSEnabled()) {
final LocationManager locationManager = (LocationManager) c.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener;
locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
myLocation = locationManager.getLastKnownLocation(locationProvider);
Toast.makeText(c, "location changed, My location is removed to"
+ myLocation.getLatitude()+","+myLocation.getLongitude(), Toast.LENGTH_LONG).show();
Latitude = myLocation.getLatitude();
Longitude = myLocation.getLongitude();
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
locationManager.requestLocationUpdates(locationProvider, (long)0, (float)0, locationListener);
myLocation = locationManager.getLastKnownLocation(locationProvider);
if(myLocation != null)
{
///
}
}

android get location in background and update listview

I'm trying to program an application which is using the current location from the user and calculating the distance and writes it into my listview.
The location doesn't have to be very accurate and i only want to fetch a new location when the list is refreshed or on app start, not continously.
My problem is that the locationlistener with gps takes too long to find a location and i have to update my list a lot before it is showing the right distance.
I was thinking about implementing a background task which gets the location and updates the list automatically when it found the position. Would that be a solution?
Is there any option to get a location faster, even if it is not as accurate as gps?
what i have so far on my location listener:
public class MyLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location location) {
lat = location.getLatitude();
lng = location.getLongitude();
myLoc.setLatitude(lat);
myLoc.setLongitude(lng);
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onProviderDisabled(String provider) {
}
}
in this method i'm calling the locationmanager and listener and creating the listview with the distance
public void getList(){
locationManager = (LocationManager) getActivity().getSystemService(getActivity().LOCATION_SERVICE);
locationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mLocationListener);
//... creating the list with distance and so on
}
i hope you can give me some hints how i can implement this that i will work as described above or tell me what i should use instead.
thanks :)

1). You can use LocationManager.NETWORK_PROVIDER
This provider determines location based on availability of cell tower and WiFi access points. Results are retrieved by means of a network lookup. Requires either of the permissions android.permission.ACCESS_COARSE_LOCATION or android.permission.ACCESS_FINE_LOCATION.
eg:- locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 500, 50, locationListener);
2). If you want to use background task then use this service
public class LocationFinder extends Service {
public static double lat, lng;
LocationManager locationManager;
public void onDestroy() {
super.onDestroy();
if (locationManager != null && locationListener != null) {
locationManager.removeUpdates(locationListener);
}
}
#Override
public void onCreate() {
Log.v("location", "===>location ed onCreate " + lat);
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
Log.v("location", "===>location ed onStartCommand " + lat + "==>" + lng);
new Handler().post(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
getLocation();
}
});
return START_STICKY;
}
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) {
}
};
private void getLocation() {
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager) getSystemService(context);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
if (locationManager != null) {
String provider = locationManager.getBestProvider(criteria, true);
if (provider != null) {
Location location = locationManager.getLastKnownLocation(provider);
updateWithNewLocation(location);
locationManager.requestLocationUpdates(provider, 500, 50, locationListener);
} else {
if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 500, 50, locationListener);
} else if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500, 50, locationListener);
} else if (locationManager.isProviderEnabled(LocationManager.PASSIVE_PROVIDER)) {
locationManager.requestLocationUpdates(LocationManager.PASSIVE_PROVIDER, 500, 50, locationListener);
}
}
}
}
private void updateWithNewLocation(Location location) {
if (location != null) {
Log.v("location", "===>location ed " + lat);
lat = location.getLatitude();
lng = location.getLongitude();
}
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}

can not find current location via gps or network

i need to find current location, either with network or gps.
i searched over internet and in stackoverflow but i cann't find what's wrong with this code.
i also set this parameter in manifest:
uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"
so here is my code:
LocationManager locationManager;
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
findCurrentLocation();
//some other stuff here
}
public void findCurrentLocation()
{
boolean networkEnabled = false;
boolean gpsEnabled = false;
currentLocation = getLastKnownLocation();
if(currentLocation == null)
{
currentLocation = new Location("sometext");
locationFindDialog = ProgressDialog.show(this, "Find Your Location", "Please Wait", false);
try
{
networkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}
catch(Exception e)
{
}
try
{
gpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
}
catch(Exception e)
{
}
if((networkEnabled == false) && (gpsEnabled == false))
{
locationFindDialog.dismiss();
showMessage("we need gps or sim card(or network) to find your location");
//show message
//you need at least one provider
return;
}
if(networkEnabled)
{
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, networkLocationListener);
}
if(gpsEnabled)
{
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, gpsLocationListener);
}
}
private final LocationListener networkLocationListener = new LocationListener()
{
#Override
public void onLocationChanged(Location location)
{
currentLocation.set(location);
//unregister listener
locationManager.removeUpdates(this);
locationManager.removeUpdates(gpsLocationListener);
locationFindDialog.dismiss();
}
#Override
public void onProviderDisabled(String provider)
{
}
#Override
public void onProviderEnabled(String provider)
{
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
};
private final LocationListener gpsLocationListener = new LocationListener()
{
#Override
public void onLocationChanged(Location location)
{
currentLocation.set(location);
//unregister listener
locationManager.removeUpdates(this);
locationManager.removeUpdates(networkLocationListener);
locationFindDialog.dismiss();
}
#Override
public void onProviderDisabled(String provider)
{
}
#Override
public void onProviderEnabled(String provider)
{
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
};
private Location getLastKnownLocation()
{
Location location = null;
List<String> providers = locationManager.getAllProviders();
for(String provider : providers)
{
location = locationManager.getLastKnownLocation(provider);
if(location != null)
{
return location;
}
}
return null;
}
no mater how much i wait, the app don't give me the location.
what's wrong with this code and how i can fix it?

finally i found a solution for this problem, the idea is finding cellId and lac manually, then send them to google secret API, and find latitude and longitude of cell tower, it's not too accurate (because it's cell tower location not user location), but enough for me.
refer to this address for more info:
http://sunil-android.blogspot.com/2013/01/convert-celllocation-to-real-location.html

set Timeout for GPS listening

I'm able to get location update from network provider but when it comes to gps it takes a lot of time for the data to be picked. I want to keep a particular time for which only the GPS listener will work and then move on to network provider after sometime. How to fix this issue ?
This is my code..
public void gpslocation()
{
final LocationManager locationManager = (LocationManager) this
.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location)
{
updateLocationForGeo(location);
//update(location);
// Called when a new location is found by the network location provider.
makeUseOfNewLocation(location);
}
private void makeUseOfNewLocation(Location location) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status,
Bundle extras) {
}
public void onProviderEnabled(String provider) {
System.out.println(provider+ "enabled provider");
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
System.out.println(provider+ "disabled provider");
networklocation();
}
};
String locationProvider = LocationManager.GPS_PROVIDER;
locationManager.requestLocationUpdates(locationProvider, 10 * 1000, (float) 10.0,locationListener);
}
public void networklocation()
{
final LocationManager locationManager = (LocationManager) this
.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location)
{
updateLocationForGeo(location);
//update(location);
// Called when a new location is found by the network location provider.
makeUseOfNewLocation(location);
}
private void makeUseOfNewLocation(Location location) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status,
Bundle extras) {
}
public void onProviderEnabled(String provider) {
System.out.println(provider+ "enabled provider");
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
System.out.println(provider+ "disabled provider");
isGpsProvidersDisabled=true;
}
};
String timeProvider = LocationManager.NETWORK_PROVIDER;
locationManager.requestLocationUpdates(timeProvider, 1 * 1000, (float) 10.0, locationListener);
}
public void updateLocationForGeo(Location location){
System.out.println("location updated");
double dev_lat = location.getLatitude();
double dev_lang = location.getLongitude();
boolean out_of_range=false;
for(int i=0; i<arrayLength; i++){
double lattDiff = Math.toRadians(latarr[i]-dev_lat);
double longDiff = Math.toRadians(lonarr[i]-dev_lang);
double distance=(Math.sin(lattDiff/2)*Math.sin(lattDiff/2))+(Math.sin(longDiff/2)*Math.sin(longDiff/2)*Math.cos( Math.toRadians(latarr[i]))*Math.cos( Math.toRadians(dev_lat)));
System.out.println(distance+" distance" );
double c= (2 * Math.atan2(Math.sqrt(distance), Math.sqrt(1-distance)));
double radius=radarr[i]* 1.60934;
double d = 6371 * c;
if(d>radius)
{
out_of_range=true;
continue;
}
else{
System.out.println("enjoy");
out_of_range=false;
break;
}
}
Any help would be greatly appreciated.

LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
mlocListener);
public class MyLocationListener implements LocationListener {
private Address mAddresses;
#Override
public void onLocationChanged(Location loc) {
loc.getLatitude();
loc.getLongitude();
Geocoder gcd = new Geocoder(getApplicationContext(),
Locale.getDefault());
try {
mAddresses = gcd.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
} catch (IOException e) {
}
String cityName = (mAddresses != null) ? mAddresses.get(0)
.getLocality() : TimeZone.getDefault().getID();
String countryName = (mAddresses != null) ? mAddresses.get(0)
.getCountryName() : Locale.getDefault().getDisplayCountry()
.toString();
mCurrentSpeed.setText("Longitude"+loc.getLongitude()+" Latitude"+loc.getLatitude());
}
#Override
public void onProviderDisabled(String provider) {
Toast.makeText(getApplicationContext(), "Gps Disabled",
Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderEnabled(String provider) {
Toast.makeText(getApplicationContext(), "Gps Enabled",
Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}

implementing latitude and longitude details in android

I am making an app in which i have to get latitude and longitude of device and my code is as follows:
mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3600, 0, mlocListener);
System.out.println("mlocManager"+mlocManager);
String str = latitude + "," + longitude ;
System.out.println("latitude"+latitude);
System.out.println("longi:"+longitude);
}
public class MyLocationListener implements LocationListener
{
public void onLocationChanged(Location loc)
{
try
{
System.out.println("............ ..............................Location changedin 11");
latitude = loc.getLatitude();
longitude = loc.getLongitude();
// System.out.println("latitude"+curr_lat);
System.out.println("longitude curr_lon");
loc.getAccuracy();
}
catch (Exception e1) {
e1.printStackTrace();
}
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
But at the end i am getting lat and long as 0.0 . Can anyone help me.

Add the following permissions
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
You should give some time to get location info like 10sec,20sec etc.For this you can use timer.
I have given an example.You can Implement like this.
private Location getCurrentLocation(){
// Acquire a reference to the system Location Manager
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
// 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.
t.cancel();
mLatitude = location.getLatitude();
mLongitude = location.getLongitude();
myGeoPoint = GeoTools.makeGeoPoint(mLatitude, mLongitude);
mapController.animateTo(myGeoPoint);
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
Location lastKnownLocation;
Timer t = new Timer();
t.schedule(new TimerTask() {
#Override
public void run() {
this.cancel();
lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
if(lastKnownLocation==null){
locationProvider = LocationManager.GPS_PROVIDER;
// Or use LocationManager.GPS_PROVIDER
lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
return lastKnownLocation;
}
},30000);
}