Develop Reference

android - can't get gps coordinate

I want to get user coordinate, the gps is on , I've asked for permission it has the permissions.
the location is set , I've my locations on other apps like google map but in my application , it doesn't work :
public boolean startService() {
try {
FetchCordinates fetchCordinates = new FetchCordinates();
fetchCordinates.execute();
return true;
} catch (Exception error) {
return false;
}
}
LocationManager mlocManager = null;
LocationListener mlocListener;
mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
if (mlocManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
startService();
}
public class FetchCordinates extends AsyncTask<String, Integer, String> {
AlertDialog.Builder a;
AlertDialog dialog;
public double lati = 0.0;
public double longi = 0.0;
public LocationManager mLocationManager;
public FetchCordinates.VeggsterLocationListener mVeggsterLocationListener;
#Override
protected void onPreExecute() {
mVeggsterLocationListener = new FetchCordinates.VeggsterLocationListener();
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 0, 0,
mVeggsterLocationListener);
a = new AlertDialog.Builder(Admins.this);
a.setMessage("در حال به دست آوردن موقعیت جغرافیایی...");
a.setPositiveButton(("بیخیال"), new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
FetchCordinates.this.cancel(true);
}
});
dialog = a.show();
TextView messageText = (TextView) dialog.findViewById(android.R.id.message);
messageText.setGravity(Gravity.RIGHT);
messageText.setTypeface(typeface);
}
#Override
protected void onCancelled() {
System.out.println("Cancelled by user!");
dialog.dismiss();
mLocationManager.removeUpdates(mVeggsterLocationListener);
}
#Override
protected void onPostExecute(String result) {
dialog.dismiss();
Log.v("this","got the location");
}
#Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
while (this.lati == 0.0 && !isCancelled()) {
}
return null;
}
public class VeggsterLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location location) {
int lat = (int) location.getLatitude(); // * 1E6);
int log = (int) location.getLongitude(); // * 1E6);
int acc = (int) (location.getAccuracy());
String info = location.getProvider();
try {
// LocatorService.myLatitude=location.getLatitude();
// LocatorService.myLongitude=location.getLongitude();
lati = location.getLatitude();
longi = location.getLongitude();
} catch (Exception e) {
// progDailog.dismiss();
// Toast.makeText(getApplicationContext(),"Unable to get Location"
// , Toast.LENGTH_LONG).show();
}
}
#Override
public void onProviderDisabled(String provider) {
Log.i("OnProviderDisabled", "OnProviderDisabled");
}
#Override
public void onProviderEnabled(String provider) {
Log.i("onProviderEnabled", "onProviderEnabled");
}
#Override
public void onStatusChanged(String provider, int status,
Bundle extras) {
Log.i("onStatusChanged", "onStatusChanged");
}
}
}
it shows me the dialog for getting the location but it never get the current location .
What's wrong with my code ?

Please provide what you wrote in your Manifest.xml file. Maybe there is something wrong with the permissions.
You need
android.permission.ACCESS_COARSE_LOCATION or android.permission.ACCESS_FINE_LOCATION
for API 5.0 or higher also:
android.hardware.location.gps

Sometimes I am getting empty location until I restart my phone why?

So I am getting the longitude and latitude as:
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
// Define a listener that responds to location updates
locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
longitude=location.getLongitude();
latitude=location.getLatitude();
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
//Or use LocationManager.GPS_PROVIDER
String locationProvider = LocationManager.NETWORK_PROVIDER;
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(locationProvider, 0, 0, locationListener);
Location lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
if(lastKnownLocation!=null){
longitude=lastKnownLocation.getLongitude();
latitude=lastKnownLocation.getLatitude();
}
then I am getting my location depending on these info:
Geocoder myLocation = new Geocoder(Time.this, Locale.getDefault());
List<Address> myList=null;
try {
myList = myLocation.getFromLocation(latitude,longitude, 1);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(myList != null && myList.size()>0) {
address= (Address) myList.get(0);
if(address.getAddressLine(0)!=null){
addressStr += address.getAddressLine(0);
}
if(address.getAddressLine(1)!=null){
addressStr += ", "+address.getAddressLine(1);
}
if(address.getAddressLine(2)!=null){
addressStr += ", " +address.getAddressLine(2);
}
}
But sometimes the location stays null until I restart my phone why that's happening? and is there a way to fix it?

Try to setup your Location Listener as below :
public class BasicMapActivity_new2 extends Activity implements
LocationListener {
private LocationManager locationManager;
private String provider;
Double Latitude, longitude;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.basic_demo);
LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
boolean enabledGPS = service
.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean enabledWiFi = service
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!enabledGPS) {
Toast.makeText(BasicMapActivity_new2.this, "GPS signal not found",
Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
} else if (!enabledWiFi) {
Toast.makeText(BasicMapActivity_new2.this,
"Network signal not found", Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the locatioin provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
if (location != null) {
onLocationChanged(location);
} else {
// do something
}
}
#Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
#Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
Location old_one;
#Override
public void onLocationChanged(Location location) {
double lat = location.getLatitude();
double lng = location.getLongitude();
// Toast.makeText(BasicMapActivity_new.this, "Location " + lat+","+lng,
// Toast.LENGTH_LONG).show();
LatLng coordinate = new LatLng(lat, lng);
Latitude = lat;
longitude = lng;
Toast.makeText(BasicMapActivity_new2.this,
"Location " + coordinate.latitude + "," + coordinate.longitude,
Toast.LENGTH_LONG).show();
}
#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
}
}
And do not forget to add permission into manifest.xml
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
Update: This is because to add requestLocationUpdates() into onResume() and removeUpdates(this); into onPause(). This way your app will stop updated locations when it is not active. add below into your Activity:
#Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
#Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}

this is a documented issue in google forums. Check this thread:
https://code.google.com/p/android/issues/detail?id=57707
Also i think the solution for this is to use Google Location API, this requires that you have Google Play services up to date and >= 2.2 i think. Hope this helps you. I battled this issue for long

android google maps v2 get last know location and always start with network provider

This Google Maps v2 api confuses me quite a bit. I have implemented it now in some way i would like to use it. I just have two small problems that i don't know how to go about.
Sometimes I don't get a location when i start the app with gps enabled or it takes way too long to get one.
So I would like it to always load with the internet location provider first to have a very fast location fix as well as always using the getlastknownlocation() first. Cant figure out how to go about it.
Here my code:
public class MapViewMain extends FragmentActivity implements LocationListener, LocationSource
{
private GoogleMap mMap;
private OnLocationChangedListener mListener;
private LocationManager locationManager;
final int RQS_GooglePlayServices = 1;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.mapviewmain);
//start power button service
Intent intent=new Intent("com.epicelements.spotnsave.START_SERVICE");
this.startService(intent);
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
Toast.makeText(this, "Google Service not found", Toast.LENGTH_LONG).show();
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
}else { // Google Play Services are available
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if(locationManager != null)
{
boolean gpsIsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean networkIsEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!gpsIsEnabled) {
// Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG).show();
PopIt("No GPS found", "Would you like to go to the settings to activate it?");
}
if(gpsIsEnabled)
{
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000L, 10F, this);
}
else if(networkIsEnabled)
{
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 5000L, 10F, this);
}
else
{
//Show an error dialog that GPS is disabled...
}
}
else
{
//Show some generic error dialog because something must have gone wrong with location manager.
}
setUpMapIfNeeded();
}
}
#Override
public void onPause()
{
if(locationManager != null)
{
locationManager.removeUpdates(this);
}
super.onPause();
}
#Override
public void onResume()
{
super.onResume();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
locationManager.getBestProvider(criteria, true);
if(mListener != null){
}
setUpMapIfNeeded();
mMap.setMyLocationEnabled(true); // Enable the my-location layer
if(locationManager != null)
{
mMap.setMyLocationEnabled(true); // Enable the my-location layer
mMap.getUiSettings().setMyLocationButtonEnabled(false);
}
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null)
{
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
// Check if we were successful in obtaining the map.
if (mMap != null)
{
setUpMap();
}
//This is how you register the LocationSource
mMap.setLocationSource(this);
}
}
/**
* This is where we can add markers or lines, add listeners or move the camera.
* <p>
* This should only be called once and when we are sure that {#link #mMap} is not null.
*/
private void setUpMap()
{
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(false);
mMap.setPadding(0,60,0,150);
Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE);
}
#Override
public void activate(OnLocationChangedListener listener)
{
mListener = listener;
}
#Override
public void deactivate()
{
mListener = null;
}
#Override
public void onLocationChanged(Location location)
{
if( mListener != null )
{
mListener.onLocationChanged( location );
double lat = location.getLatitude();
double lng = location.getLongitude();
LatLng coordinate = new LatLng(lat, lng);
//save coordinate
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0); // 0 - for private mode
Editor editor = pref.edit();
editor.putFloat("lat", (float) location.getLatitude());
editor.putFloat("lng", (float) location.getLongitude());
editor.putFloat("accuracy", (float) location.getAccuracy());
editor.commit();
//marker stuff
mMap.clear();
mMap.addMarker(new MarkerOptions()
.position(coordinate)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 16));
}
}
#Override
public void onProviderDisabled(String provider)
{
// TODO Auto-generated method stub
// Toast.makeText(this, "provider disabled", Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderEnabled(String provider)
{
// TODO Auto-generated method stub
// Toast.makeText(this, "provider enabled", Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
// TODO Auto-generated method stub
// Toast.makeText(this, "status changed", Toast.LENGTH_SHORT).show();
}
// Alarm Dialog if GPS not enabled
public void PopIt( String title, String message ){
new AlertDialog.Builder(this)
.setTitle( title )
.setMessage( message )
.setCancelable(false)
.setPositiveButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
//do stuff onclick of YES
//AlertDialog.dismiss();
}
})
.setNegativeButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
//do stuff onclick of CANCEL
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
}).show();
}
}

You can use LocationClient for your purpose its give LastLocation very fast.
first declare class variable
private LocationClient client;
after in onCreate
try {
if (map == null) {
MapsInitializer.initialize(this);
client = new LocationClient(this, new ConnectionCallbacks() {
#Override
public void onDisconnected() {
// TODO Auto-generated method stub
}
#Override
public void onConnected(Bundle connectionHint) {
// TODO Auto-generated method stub
Toast.makeText(MotoFreightHomeMapMainActivity.this,
"onConnected", Toast.LENGTH_LONG).show();
Location currentLocation = client.getLastLocation();
if (currentLocation != null) {
//do you stuff here
}
}
}, new OnConnectionFailedListener() {
#Override
public void onConnectionFailed(ConnectionResult result) {
// TODO Auto-generated method stub
}
});
client.connect();
}
} catch (GooglePlayServicesNotAvailableException e) {
// TODO handle this situation
etMap.setVisibility(View.INVISIBLE);
btnEditLocation.setVisibility(View.INVISIBLE);
Toast.makeText(this, "Please install Google Play Library",
Toast.LENGTH_SHORT).show();
}
see full code here
http://developer.android.com/training/location/retrieve-current.html

You can find a sample and tutorial from here.

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) {
}
}

Testing GPS current location on Android mobile phone

When, I test this code on my android mobile phone the current location doesn't show up. Should I configure my mobile or increment new code into the code to allow it run on my mobile properly. A hint will be much appreciated. the code is as follows
public class GetLocation extends Activity {
TextView tv;
double latitude,longitude,accuracy;
private LocationManager lm;
private LocationListener lo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView)this.findViewById(R.id.txtLocation);
lm=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
lo = new mylocationlistener();
tv.setText("waiting for location");
if (!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){
createGpsDisabledAlert();
}
}
//dialog to check if gps enabled or not
private void createGpsDisabledAlert() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Your GPS is disabled! Would you like to enable it?")
.setCancelable(false)
.setPositiveButton("Enable GPS",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
showGpsOptions();
}
});
builder.setNegativeButton("Do nothing",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
dialog.cancel();
}
}); //close negative builder
AlertDialog alert = builder.create();
alert.show();
}
private void showGpsOptions(){
Intent gpsOptionsIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(gpsOptionsIntent);
}
private class mylocationlistener implements LocationListener {
public void onLocationChanged(Location location) {
if (location !=null){
longitude = location.getLongitude();
latitude = location.getLatitude();
accuracy = location.getAccuracy();
/*
Log.d("LOCATION CHANGED", latitude + "");
Log.d("LOCATION CHANGED", longitude + "");
*/ String str = "\n CurrentLocation: "+
"\n Latitude: "+ latitude +
"\n Longitude: " + longitude +
"\n Accuracy: " + accuracy;
Toast.makeText(GetLocation.this,str,Toast.LENGTH_LONG).show();
tv.append(str);
}
}
public void onProviderDisabled(String provider) {
Toast.makeText(GetLocation.this,"Error onProviderDisabled",Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String provider) {
Toast.makeText(GetLocation.this,"onProviderEnabled",Toast.LENGTH_LONG).show();
}
public void onStatusChanged(String provider, int status, Bundle extras) {
Toast.makeText(GetLocation.this,"onStatusChanged",Toast.LENGTH_LONG).show();
}
}
#Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
public void onResume(){
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, lo);
super.onResume();
}
}

In your onCreate you need to call lm.requestLocationUpdates() to get your location listener working . See Requesting Location Updates