Develop Reference

Unable to get GPS location

I want user location. both network and GPS location. i am getting network location but GPS location is always null. here is the code that i write for that.
public class GetLocation extends Service implements LocationListener {
LocationManager locationManager;
Location networkLocation, gpsLocation;
Intent intentBroadcastLocationUpdate;
boolean gpslocationOn, networklocationOn;
Handler handler = new Handler();
Runnable runnable = new Runnable() {
#Override
public void run() {
gpsLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
networkLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
broadcastLocation();
handler.postDelayed(this, 3000);
}
};
#Override
public void onCreate() {
super.onCreate();
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
intentBroadcastLocationUpdate = new Intent("UPDATE_LOCATION");
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10, 1000 * 60 * 1, this);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 10, 1000 * 60 * 1, this);
networkLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
gpsLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
networklocationOn = true;
gpslocationOn = true;
broadcastLocation();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
handler.postDelayed(runnable, 3000);
return START_STICKY;
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public void onLocationChanged(Location location) {
Toast.makeText(getApplicationContext(),
location.getProvider() + " Location Changed:" + location.getLatitude() + " , "
+ location.getLongitude(), Toast.LENGTH_LONG).show();
};
#Override
public void onProviderDisabled(String arg0) {
Toast.makeText(getApplicationContext(), arg0 + " Disabled", Toast.LENGTH_LONG).show();
}
#Override
public void onProviderEnabled(String provider) {
if (provider.equals("network")) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 10, 1000 * 60 * 1, this);
}
if (provider.equals("gps")) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10, 1000 * 60 * 1, this);
}
Toast.makeText(getApplicationContext(), provider + " Enabled", Toast.LENGTH_LONG).show();
}
#Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
}
#Override
public void onDestroy() {
super.onDestroy();
locationManager.removeUpdates(this);
handler.removeCallbacks(runnable);
}
private void broadcastLocation() {
if (gpsLocation == null && networkLocation == null) {
Toast.makeText(getApplicationContext(),
"on create Couldn't get user location", Toast.LENGTH_LONG).show();
intentBroadcastLocationUpdate.putExtra("loc", "Could not retrive location");
sendBroadcast(intentBroadcastLocationUpdate);
} else if (gpsLocation != null) {
intentBroadcastLocationUpdate.putExtra("loc", "GPS:" + gpsLocation.getLatitude() + ","
+ gpsLocation.getLongitude());
sendBroadcast(intentBroadcastLocationUpdate);
} else if (networkLocation != null) {
intentBroadcastLocationUpdate.putExtra("loc", "Net:" + networkLocation.getLatitude() + ","
+ networkLocation.getLongitude());
sendBroadcast(intentBroadcastLocationUpdate);
} else if (gpsLocation != null && networkLocation != null) {
intentBroadcastLocationUpdate.putExtra(
"loc",
"Net:" + networkLocation.getLatitude() + ","
+ networkLocation.getLongitude() + " AND GPS:"+ gpsLocation.getLatitude() + ","
+ gpsLocation.getLongitude());
sendBroadcast(intentBroadcastLocationUpdate);
}
}
}
Can anybody tell me what is wrong that i am doing? why i'm unable to get GPS location? and what is the best practice of getting GPS location?

Add these permissions in your manifest
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
Refer this tutorial

public void getMyLocation() {
LocationManager locationManager = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
List<String> providers = locationManager.getProviders(true);
Location l = null;
for (int i = 0; i < providers.size(); i++) {
l = locationManager.getLastKnownLocation(providers.get(i));
if (l != null)
break;
}
if (l != null) {
latitude = l.getLatitude();
longitude = l.getLongitude();
}
}

How can I start Android service separately?

Here what I need, how can I start Android service separately?
I got service running from background (Preference.Class),
public void startService(){
Intent intent;
intent = new Intent(getBaseContext(), ForegroundService.class);
startService(intent);
intent = new Intent(getBaseContext(), PostMobileHistory.class);
startService(intent);
intent = new Intent(getBaseContext(), PostLocation.class);
startService(intent);
sharedPreferences.edit().putBoolean("serviceStatus", true).commit();
}
and start the Location Manager which run in service after from the BroadcastReceiver, but why the previous service gone, and just only Lcation Manager left?
public class LocationManager extends Service implements LocationListener{
private android.location.LocationManager locationManager;
private String previousProvider = "gps";
private float previousAccuracy = 100;
public String mobileHistory_GUID = null;
Context context = this;
#Override
public void onCreate() {
SharedPreferences sharedPreferences = context.getSharedPreferences("mobileHistory", Context.MODE_PRIVATE);
mobileHistory_GUID = sharedPreferences.getString("GUID", "DEFAULT");
Log.i("SP Mobile History GUID", mobileHistory_GUID);
startTracking();
}
public void onDestroy(){
stopTracking();
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
public void stopTracking(){
if(locationManager != null){
locationManager.removeUpdates(this);
Log.i("Location Manager", "Tracking stopped");
}
}
public void startTracking() {
//Get the location manager
locationManager = (android.location.LocationManager) getSystemService(Context.LOCATION_SERVICE);
boolean isGPSEnabled = locationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER);
boolean isNetworkEnabled = locationManager.isProviderEnabled(android.location.LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
Log.i("Provider Status", "No provider");
}
else {
if (isNetworkEnabled) {
String locationProvider = android.location.LocationManager.NETWORK_PROVIDER;
Log.i("Provider Status", "Network enabled");
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(locationProvider, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
}
if (isGPSEnabled) {
String locationProvider = android.location.LocationManager.GPS_PROVIDER;
Log.i("Provider Status", "GPS enabled");
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(locationProvider, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
}
}
if(locationManager != null){
Log.i("Location Manager", "Tracking started");
}
}
public void onLocationChanged(Location location) {
SharedPreferences sharedPreferences = context.getSharedPreferences("mobileHistory", Context.MODE_PRIVATE);
String mobileHistory_GUID = sharedPreferences.getString("GUID", "DEFAULT");
String location_GUID = String.valueOf(UUID.randomUUID());
if (location != null) {
String latitude = valueOf(location.getLatitude());
String longitude = valueOf(location.getLongitude());
String altitude = valueOf(location.getAltitude());
String accuracy = valueOf(location.getAccuracy());
String speed = valueOf(location.getSpeed());
String provider = location.getProvider();
float floatAccuracy = Float.valueOf(accuracy);
if(floatAccuracy <= 20 && provider.equals("gps")){
Arrays.setLocationArrayList(new Model_Location(location_GUID, mobileHistory_GUID, provider, latitude, longitude, altitude, accuracy, speed));
Log.i("Location", "GPS");
Log.i("Location", "<= 20");
Log.i("Location", latitude + " " + longitude + " " + altitude + " " + accuracy + " " + speed);
previousProvider = provider;
previousAccuracy = floatAccuracy;
}
else if(floatAccuracy > 20 && provider.equals("gps")){
previousProvider = provider;
previousAccuracy = floatAccuracy;
}
else if(floatAccuracy > 20 && floatAccuracy <= 100 && provider.equals("network")){
if(previousAccuracy > 20 && previousProvider.equals("gps")){
Arrays.setLocationArrayList(new Model_Location(location_GUID, mobileHistory_GUID, provider, latitude, longitude, altitude, accuracy, speed));
Log.i("Location", "Network");
Log.i("Location", ">= 20 && <= 50");
Log.i("Location", latitude + " " + longitude + " " + altitude + " " + accuracy + " " + speed);
}
}
else{
Log.i("Location", latitude + " " + longitude + " " + altitude + " " + accuracy + " " + speed);
}
}
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}

The problem solve, I shouldn't put function in the onCreate() on service, moved to onStartCommand() and its work perfectly well...

Cannot get current location coordinates

I want to get current longitude and latitude as int
So I use this code
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
0, this);
Location location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
try {
gps_enabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
} catch (Exception ex) {
}
try {
network_enabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
} catch (Exception ex) {
}
// don't start listeners if no provider is enabled
if (!gps_enabled && !network_enabled) {
....Notify
}
if (gps_enabled) {
if (location != null) {
longitude =(int) (location.getLongitude()*1e6);
latitude = (int) (location.getLatitude()*1e6);
String accuracy = "Accuracy: " + location.getAccuracy();
}
}
if (network_enabled) {
if (location != null) {
longitude =(int) (location.getLongitude()*1e6);
latitude = (int) (location.getLatitude()*1e6);
String accuracy = "Accuracy: " + location.getAccuracy();
}
}
locationManager.removeUpdates(this);
Unfortunately longitude and latitude are always null.
I have all permission needed in the manifest.
How can I fix this issue?

Well this is what i use for location listener
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
public class LocationUtils implements LocationListener{
Context context;
private String provider;
private LocationManager locationManager;
private String latitude="no value";
private String longitude="no value";
public LocationUtils(Context context) {
this.context=context;
// Get the location manager
locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the locatioin provider -> use
// default
latitude="no value";
longitude="no value";
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
/*Toast.makeText(context, "Provider " + provider + " has been selected.",
Toast.LENGTH_SHORT).show();*/
// System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
} else {
/*Toast.makeText(context, "Location not available",
Toast.LENGTH_SHORT).show();*/
}
}
#Override
public void onLocationChanged(Location location) {
double lat = (double) (location.getLatitude());
double lng = (double) (location.getLongitude());
latitude = lat + "";
longitude = lng + "";
/* Toast.makeText(context, " lat: "+lat +" Long:"+lng,
Toast.LENGTH_SHORT).show(); */
}
#Override
public void onProviderDisabled(String provider) {
//Toast.makeText(context, "Disabled provider " + provider,
// Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderEnabled(String provider) {
//Toast.makeText(context, "Enabled new provider " + provider,
// Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
public String getLatitude() {
return latitude;
}
public String getLongitude() {
return longitude;
}
}
Now in your activity u can get
LocationUtils appLocationManager = new LocationUtils(getContext());
String latitude = appLocationManager.getLatitude();
String longitude = appLocationManager.getLongitude();
Also add
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
in your manifest file

First check the GPS enabled in your device.
Check all the permissions included in the manifest
You are fetching the last known location using the GPS provider so remove that line and fetch the location individually for both the provider(There should be possible that your GPS is not available at that time so you did not get the location and you are fetching the last known location using the GPS so it can be null and if location will be null then it will not goes inside the conditions like if(network_enabled) and if(gps_enabled).).
In short check the Last known location of GPS if it is null then try to get the location using the Location provider and use that location.

public class SMS_Service extends Service {
private final String LOGTAG = "SMS_Service";
String latLongString;
String addressString;
double altitude;
int LAC;
int mcc = 0;
int mnc = 0;
String pn_no;
Altitude_Details ld = new Altitude_Details();
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
Log.e(LOGTAG, "created");
}
#Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.e(LOGTAG, "destroyed");
}
#Override
public void onStart(Intent intent, int startId) {
// TODO Auto-generated method stub
super.onStart(intent, startId);
Log.e(LOGTAG, "started");
SmsManager sms = SmsManager.getDefault();
// get phone number from shared preference
SharedPreferences default1 = getSharedPreferences("Device",
MODE_WORLD_WRITEABLE);
pn_no = default1.getString("Phone_NO", "");
Log.e("phone_no in sms service", pn_no);
String From = intent.getStringExtra("From");
String Msg = intent.getStringExtra("Msg"); // get message from intent
Log.e("ON start:", "" + From);
Log.e("ON start:", "" + Msg);
String number = From.substring(7, 11);
Log.e("ON start: SUBSTRING", "" + number);
// check msg for Location keyword match or not
if (Msg.equals("LOCATION") && pn_no.equals(number)) {
Log.e("location:", "Location found");
TelephonyManager tel = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String networkOperator = tel.getNetworkOperator();
// find MNC and MCC
if (networkOperator != null) {
mcc = Integer.parseInt(networkOperator.substring(0, 3));
mnc = Integer.parseInt(networkOperator.substring(3));
Log.e("MCC", "" + mcc);
Log.e("MNC", "" + mnc);
}
// find LAC for GSM
if (tel.getPhoneType() == TelephonyManager.PHONE_TYPE_GSM) {
final GsmCellLocation location = (GsmCellLocation) tel
.getCellLocation();
if (location != null) {
LAC = location.getLac();
Log.e("cell location", "LAC: " + location.getLac()
+ " CID: " + location.getCid());
}
}
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager) getSystemService(context);
String provider = LocationManager.GPS_PROVIDER;
Location location = locationManager.getLastKnownLocation(provider);
// update method return latest location
updateWithNewLocation(location);
// location change then listner called
locationManager.requestLocationUpdates(provider, 2000, 10,
locationListener);
// send mcc,mnc,latitude,longitude,altitude,address,Link in message
String Url = "http://itouchmap.com/latlong.html";
sms.sendTextMessage(pn_no, null, "\nLocation:\n" + "MCC: " + mcc
+ "\nMNC: " + mnc + "\nLAC:" + LAC + latLongString
+ "\nAltitude:" + altitude + "feet"
+ "\nGo to Below site:\n" + Url, null, null);
sms.sendTextMessage(pn_no, null, "\nAddress:\n" + addressString,
null, null);
// stop service automatically
SMS_Service.this.stopSelf();
}
else {
Log.e("loation:", "Location not found");
SMS_Service.this.stopSelf();
}
}
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) {
}
};
private void updateWithNewLocation(Location location) {
// TODO Auto-generated method stub
addressString = "\nno address found";
// check location get or not from provider
if (location != null) {
// get latitude and longitude
double latitude = location.getLatitude();
double longitude = location.getLongitude();
latLongString = "\nLat:" + latitude + "\nLong:" + longitude;
Log.e("location", "" + latLongString);
// get altitude from method
altitude = ld.getElevationFromGoogleMaps(latitude, longitude);
Log.e("Altitude", "" + altitude);
// find address from latitude and longitude
Geocoder gc = new Geocoder(this, Locale.getDefault());
try {
List<Address> addresses = gc.getFromLocation(latitude,
longitude, 1);
StringBuilder sb = new StringBuilder();
if (addresses.size() > 0) {
Address address = addresses.get(0);
for (int i = 0; i <= address.getMaxAddressLineIndex(); i++)
sb.append(address.getAddressLine(i)).append("\n");
}
addressString = sb.toString();
Log.e("Address", "" + addressString);
} catch (IOException e) {
}
} else {
latLongString = "\n No location found";
Log.e("location", "" + latLongString);
}
}
}
hey you can make the service and use this code to get altitude and latitude and decode this using class

Try This code
double longitude,latitude;
int lon,lat;
getcurrentloc.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
Toast.makeText(GpsLocationFinder.this, "Enable Your GPS", Toast.LENGTH_LONG).show();
}else{
LocationResult locationResult=new LocationResult() {
#Override
public void gotLocation(Location location) {
// TODO Auto-generated method stub
longitude=location.getLongitude();
latitude=location.getLatitude();
lon=(int)longitude;
lat=(int)latitude;
Toast.makeText(GpsLocationFinder.this, "Current Longitude"+longitude+" Current Latitude"+latitude,Toast.LENGTH_LONG).show();
}
};
MyLocation myLocation = new MyLocation();
myLocation.getLocation(GpsLocationFinder.this, locationResult);
}
}
});
And the MyLocation Class is Below
public class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled=false;
boolean network_enabled=false;
double longitude,latitude;
public boolean getLocation(Context context, LocationResult result)
{
//I use LocationResult callback class to pass location value from MyLocation to user code.
//Log.e("GPS DISTANCE","GPS Enabled");
locationResult=result;
if(lm==null)
lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
//exceptions will be thrown if provider is not permitted.
//don't start listeners if no provider is enabled
//try{
try{
gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
}catch(Exception ex){
}
try{
network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}catch(Exception ex){
}
if(!gps_enabled && !network_enabled){
return false;
}
if(gps_enabled){
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 100, 100, locationListenerGps);
}
if(network_enabled)
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
timer1=new Timer();
timer1.schedule(new GetLastLocation(), 30000);
return true;
}
LocationListener locationListenerGps = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerNetwork);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
LocationListener locationListenerNetwork = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerGps);
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
class GetLastLocation extends TimerTask {
#Override
public void run() {
lm.removeUpdates(locationListenerGps);
lm.removeUpdates(locationListenerNetwork);
Location net_loc=null, gps_loc=null;
if(gps_enabled)
gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(network_enabled)
net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
//if there are both values use the latest one
if(gps_loc!=null && net_loc!=null){
if(gps_loc.getTime()>net_loc.getTime())
locationResult.gotLocation(gps_loc);
else
locationResult.gotLocation(net_loc);
return;
}
if(gps_loc!=null){
locationResult.gotLocation(gps_loc);
return;
}
if(net_loc!=null){
locationResult.gotLocation(net_loc);
return;
}
locationResult.gotLocation(null);
}
}
public static abstract class LocationResult{
public abstract void gotLocation(Location location);
}
}

Cannot find current location using GPS

I have tried the below program. It is working in eclipse -> if u give lattitude and longitude value through ddms means it displayed in emulator as current position....
but its not detecting current position in android phone.
private class mylocationlistener implements LocationListener {
public void onLocationChanged(Location location) {
Date today = new Date();
Timestamp currentTimeStamp = new Timestamp(today.getTime());
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener ll = new mylocationlistener();
boolean isGPS = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (isGPS){
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
if (location != null) {
Log.d("LOCATION CHANGED", location.getLatitude() + "");
Log.d("LOCATION CHANGED", location.getLongitude() + "");
String str = "\n CurrentLocation: "+
"\n Latitude: "+ location.getLatitude() +
"\n Longitude: " + location.getLongitude() +
"\n Accuracy: " + location.getAccuracy() +
"\n CurrentTimeStamp "+ currentTimeStamp;
Toast.makeText(MainActivity.this,str,Toast.LENGTH_SHORT).show();
tv.append(str);
}
else
{
String s1="GPS activation in process";
Toast.makeText(MainActivity.this,s1,Toast.LENGTH_SHORT).show();
/*alert.setTitle("gps");
alert.setMessage("GPS activation in progress,\n Please click after few second.");
alert.setPositiveButton("OK", null);
alert.show();*/
}
}
else
{
String s2="Enable Gps";
Toast.makeText(MainActivity.this,s2,Toast.LENGTH_SHORT).show();
}
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}

I made one service for that. It is easy for get Longitude / Latitude using it.
Copy/paste this class in your project.
package com.sample;
import com.sample.globalconstant;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class MyServiceGPS extends Service
{
private static final String TAG = "BOOMBOOMTESTGPS";
private LocationManager mLocationManager = null;
private static final int LOCATION_INTERVAL = 1000;
private static final float LOCATION_DISTANCE = 10f;
private class LocationListener implements android.location.LocationListener{
Location mLastLocation;
public LocationListener(String provider)
{
Log.e(TAG, "LocationListener " + provider);
mLastLocation = new Location(provider);
}
public void onLocationChanged(Location location)
{
Log.e(TAG, "onLocationChanged: " + location.getLatitude() +"....."+ location.getLongitude());
globalconstant.lat = location.getLatitude();
globalconstant.lon = location.getLongitude();
Toast.makeText(getApplicationContext(), location.getLatitude() +"....."+ location.getLongitude(), 1000).show();
mLastLocation.set(location);
}
public void onProviderDisabled(String provider)
{
Log.e(TAG, "onProviderDisabled: " + provider);
}
public void onProviderEnabled(String provider)
{
Log.e(TAG, "onProviderEnabled: " + provider);
}
public void onStatusChanged(String provider, int status, Bundle extras)
{
Log.e(TAG, "onStatusChanged: " + provider);
}
}
LocationListener[] mLocationListeners = new LocationListener[] {
new LocationListener(LocationManager.GPS_PROVIDER),
new LocationListener(LocationManager.NETWORK_PROVIDER)
};
#Override
public IBinder onBind(Intent arg0)
{
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.e(TAG, "onStartCommand");
super.onStartCommand(intent, flags, startId);
return START_STICKY;
}
#Override
public void onCreate()
{
Log.e(TAG, "onCreate");
initializeLocationManager();
try {
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[1]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "network provider does not exist, " + ex.getMessage());
}
try {
mLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[0]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "gps provider does not exist " + ex.getMessage());
}
}
#Override
public void onDestroy()
{
Log.e(TAG, "onDestroy");
super.onDestroy();
if (mLocationManager != null) {
for (int i = 0; i < mLocationListeners.length; i++) {
try {
mLocationManager.removeUpdates(mLocationListeners[i]);
} catch (Exception ex) {
Log.i(TAG, "fail to remove location listners, ignore", ex);
}
}
}
}
private void initializeLocationManager() {
Log.e(TAG, "initializeLocationManager");
if (mLocationManager == null) {
mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
}
}
}
Copy this code in your Activity when you want to start:
startService(new Intent(this,MyServiceGPS.class));
Create one class globalconstant:
public class globalconstant { public static double lat, lon; }
when you want to current latitude and longitude in your project only write this globalconstant.lat ,globalconstant.lon
Add uses-permission in Manifest

If you want to overlay of your current location then it is better to use default method instead of custom overlay..
Here is default overlay method of current location.
MyLocationOverlay mMyLocationOverlay = new MyLocationOverlay(getApplicationContext(),
Your_MapView);
mMyLocationOverlay.enableMyLocation();
mMyLocationOverlay.onProviderEnabled(LocationManager.NETWORK_PROVIDER);
mapOverlays = map_view.getOverlays();
you can also use GPS
mMyLocationOverlay.onProviderEnabled(LocationManager.GPS_PROVIDER);

you can use this Example for Finding Location Periodically

Is it possible that your android phone is not getting a GPS signal? locationManager.getLastKnownLocation will return null if the GPS has not had time to get a fix yet. Android does not provide a 'give me the location now' method. When the GPS has got a fix, the onLocationChanged() will run. If it is fine with emulator, then there is some problem with the device. Checkout my question Not able to get Location by GPS : Android I had similar problem. What happened with me was that I was receiving location in google maps by network provider. Are you sure you are receiving it through GPS?

my application get crashed when gps turned off?

hi i am doing a application based on gps,i use gps as service for my project ,when gps is turn on it show the location correctly and application runs fine ,but after that i exit from my app completely and when the gps turned off the it shows crash message.which mean even if l leave or exit my app the service class is still running ,and also app get crash if i turn off gps when app is running ,but if i did not turn of gps it work fine.Now how can i solve this problem. i will show my service class used for gps
public class Gps_Service extends Service {
TextView txtv;
List<Address> myList;
String addressStr;
LocationManager lm;
LocationListener ll;
SQLiteDatabase DiaryDB = null;
#Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onCreate() {
super.onCreate();
System.out.println("########### serviceOnCreate");
// Toast.makeText(this, "GPS Service started(Diary)", Toast.LENGTH_LONG).show();
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
ll = new mylocationlistener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
}
#Override
public void onDestroy() {
super.onDestroy();
// Toast.makeText(this, "GPS Service Destroyed(Diary)", Toast.LENGTH_LONG).show();
lm.removeUpdates(ll);
System.out.println("########### inside ONDESTROY GPS listener removed");
}
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.v("StartServiceAtBoot", "StartAtBootService -- onStartCommand()");
// Toast.makeText(this, "Service started", Toast.LENGTH_LONG).show();
// We want this service to continue running until it is explicitly
// stopped, so return sticky.
return START_STICKY;
}
private class mylocationlistener implements LocationListener
{
public void onLocationChanged(Location location)
{
if (location != null) {
Geocoder myLocation = new Geocoder(Gps_Service.this, Locale.getDefault());
// Toast.makeText(MyService.this,location.getLatitude() + " " + location.getLongitude() +"\n",Toast.LENGTH_LONG).show();
// DiaryDB = MyService.this.openOrCreateDatabase("DIARY_DATABASE", MODE_PRIVATE, null);
// DiaryDB.execSQL("INSERT INTO Locations(LATITUDE, LONGITUDE) VALUES('" +location.getLatitude()+"','"+location.getLongitude()+"')");
// DiaryDB.close();
// ParseTweetsActivity.latitude = ""+location.getLatitude();
//ParseTweetsActivity.longitude = ""+location.getLongitude();
AndroidGoogleMapsActivity.lats = Double.parseDouble(""+location.getLatitude());
AndroidGoogleMapsActivity.longt = Double.parseDouble(""+location.getLongitude());
Advertiser_get_direction.latitudefrom = Double.parseDouble(""+location.getLongitude());
Advertiser_get_direction.longtitudefrom = Double.parseDouble(""+location.getLongitude());
AndroidGoogleMapsActivity.longt = Double.parseDouble(""+location.getLongitude());
System.out.println("saaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"+AndroidGoogleMapsActivity.lats);
// ParseTweetsActivity.load();
try
{
myList = myLocation.getFromLocation(location.getLatitude(),location.getLongitude(), 1);
} catch (IOException e) {
e.printStackTrace();
}
if(myList!=null)
{
Address address = (Address) myList.get(0);
addressStr = "";
addressStr += address.getAddressLine(0) + "\n";
addressStr += address.getAddressLine(1) + "\n";
addressStr += "Country name "+address.getCountryName() + "\n";
addressStr += "Locality "+address.getLocality() + "\n";
addressStr += "Country code "+address.getCountryCode() + "\n";
addressStr += "Admin Area "+address.getAdminArea() + "\n";
addressStr += "SubAdmin Area "+address.getSubAdminArea() + "\n";
addressStr += "PostalCode "+address.getPostalCode() + "\n";
// txtv.append(location.getLatitude() + " " + location.getLongitude() +"\n");
// txtv.append(addressStr+"\n");
System.out.println(location.getLatitude() + " " + location.getLongitude() +"\n");
lm.removeUpdates(ll);
}
}
}
public void onProviderDisabled(String provider)
{
// Toast.makeText(MyService.this,"Provider Disabled",Toast.LENGTH_LONG).show();
txtv.setText("");
}
public void onProviderEnabled(String provider)
{
// Toast.makeText(MyService.this,"Provider Enabled.....",Toast.LENGTH_LONG).show();
}
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
}
}

You have declared a TextView within your Service. That's not good. TextView is a UI component and doesn't belong on the service.
In your onProviderDisabled() method, you call txtv.setText(""); which will probably crash because txtv is null. This is probably why your app is crashing when you disable GPS.

Change your code from
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
ll = new mylocationlistener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
to following
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
ll = new mylocationlistener();
if (lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0,ll);
}

I had a problem like this when i didn`t release listener in the onDestroy().
Try to add the following code:
lm.unregisterListener(ll);