How to get the latest known location for location manager in Android?

Question

I use a simple location manager to get the lastKnownLocation () device but getting a null object in return can someone tell me why?

The code:

public Location getLocation() { LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); if (locationManager != null) { Location lastKnownLocationGPS = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); if (lastKnownLocationGPS != null) { return lastKnownLocationGPS; } else { Location loc = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER); System.out.println("1::"+loc);----getting null over here System.out.println("2::"+loc.getLatitude()); return loc; } } else { return null; } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.location); getLocation();-----calling service } 

permissions:

  <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 

so is something missing for customization? I checked that my location service is included in the device, give some links for working examples

Answer 1

Stupid thing, as the answer to this ... I restarted my device ... and it worked ... Please make sure your location service is turned on and working fine

Answer 2

The thing I'm using to locate with a place name is on

 GPSTracker gpsTracker = new GPSTracker(CameraActivity.this); String stringLatitude = "", stringLongitude = "", nameOfLocation=""; if (gpsTracker.canGetLocation()) { stringLatitude = String.valueOf(gpsTracker.latitude); stringLongitude = String.valueOf(gpsTracker.longitude); nameOfLocation = ConvertPointToLocation(stringLatitude,stringLongitude); } public String ConvertPointToLocation(String Latitude, String Longitude) { String address = ""; Geocoder geoCoder = new Geocoder(getBaseContext(), Locale.getDefault()); try { List<Address> addresses = geoCoder.getFromLocation( Float.parseFloat(Latitude), Float.parseFloat(Longitude), 1); if (addresses.size() > 0) { for (int index = 0; index < addresses.get(0) .getMaxAddressLineIndex(); index++) address += addresses.get(0).getAddressLine(index) + " "; } } catch (IOException e) { e.printStackTrace(); } return address; } 

GPSTracker.java

 package in.appology.lss; import java.io.IOException; import java.util.List; import java.util.Locale; import android.app.AlertDialog; import android.app.Service; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.location.Address; import android.location.Geocoder; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.os.IBinder; import android.provider.Settings; import android.util.Log; /** * Create this Class from tutorial : * http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial * * For Geocoder read this : * http://stackoverflow.com/questions/472313/android-reverse * -geocoding-getfromlocation * */ public class GPSTracker extends Service implements LocationListener { private final Context mContext; // flag for GPS Status boolean isGPSEnabled = false; // flag for network status boolean isNetworkEnabled = false; boolean canGetLocation = false; Location location; double latitude; double longitude; // The minimum distance to change updates in metters private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 // metters // The minimum time beetwen updates in milliseconds private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute // Declaring a Location Manager protected LocationManager locationManager; public GPSTracker(Context context) { this.mContext = context; 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); updateGPSCoordinates(); } } // 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); updateGPSCoordinates(); } } } } } catch (Exception e) { // e.printStackTrace(); Log.e("Error : Location", "Impossible to connect to LocationManager", e); } return location; } public void updateGPSCoordinates() { if (location != null) { latitude = location.getLatitude(); longitude = location.getLongitude(); } } /** * Stop using GPS listener Calling this function will stop using GPS in your * app */ public void stopUsingGPS() { if (locationManager != null) { locationManager.removeUpdates(GPSTracker.this); } } /** * Function to get latitude */ public double getLatitude() { if (location != null) { latitude = location.getLatitude(); } return latitude; } /** * Function to get longitude */ public double getLongitude() { if (location != null) { longitude = location.getLongitude(); } return longitude; } /** * Function to check GPS/wifi enabled */ public boolean canGetLocation() { return this.canGetLocation; } /** * Function to show settings alert dialog */ public void showSettingsAlert() { AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext); // Setting Dialog Title alertDialog.setTitle("GPS"); // Setting Dialog Message alertDialog .setMessage("Please enable location in settings for accurate results!"); // On Pressing Setting button alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Intent intent = new Intent( Settings.ACTION_LOCATION_SOURCE_SETTINGS); mContext.startActivity(intent); } }); // On pressing cancel button alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); alertDialog.show(); } /** * Get list of address by latitude and longitude * * @return null or List<Address> */ public List<Address> getGeocoderAddress(Context context) { if (location != null) { Geocoder geocoder = new Geocoder(context, Locale.ENGLISH); try { List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1); return addresses; } catch (IOException e) { // e.printStackTrace(); Log.e("Error : Geocoder", "Impossible to connect to Geocoder", e); } } return null; } /** * Try to get AddressLine * * @return null or addressLine */ public String getAddressLine(Context context) { List<Address> addresses = getGeocoderAddress(context); if (addresses != null && addresses.size() > 0) { Address address = addresses.get(0); String addressLine = address.getAddressLine(0); return addressLine; } else { return null; } } /** * Try to get Locality * * @return null or locality */ public String getLocality(Context context) { List<Address> addresses = getGeocoderAddress(context); if (addresses != null && addresses.size() > 0) { Address address = addresses.get(0); String locality = address.getLocality(); return locality; } else { return null; } } /** * Try to get Postal Code * * @return null or postalCode */ public String getPostalCode(Context context) { List<Address> addresses = getGeocoderAddress(context); if (addresses != null && addresses.size() > 0) { Address address = addresses.get(0); String postalCode = address.getPostalCode(); return postalCode; } else { return null; } } /** * Try to get CountryName * * @return null or postalCode */ public String getCountryName(Context context) { List<Address> addresses = getGeocoderAddress(context); if (addresses != null && addresses.size() > 0) { Address address = addresses.get(0); String countryName = address.getCountryName(); return countryName; } else { return null; } } @Override public void onLocationChanged(Location location) { } @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 intent) { return null; } } 

Answer 3

  // Get the location from the given provider Location location = locationManager .getLastKnownLocation(provider); locationManager.requestLocationUpdates(provider, 1000, 1, this); 

Answer 4

Below I am trying to get the latest location.

 private void setUpMap(){ //Location location = mMap.getMyLocation(); mMap.setMyLocationEnabled(true); //mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker")); mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() { @Override public void onMyLocationChange(Location location) { mMap.addMarker(new MarkerOptions().position(new LatLng(location.getLatitude(), location.getLongitude())).title("My Location")); mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(),location.getLongitude()),10)); mMap.setOnMyLocationChangeListener(null); } }); } 

Answer 5

Before getting the latest location, maybe you want to get the current location, check if it is zero or there. if the last location is not set, if you want to use FusedLocationProviderClient and add this before use:

implementation 'com.google.android.gms: play-services-location: 16.0.0'

on your build.gradle (Module: app) and call the zoomMyCuurentLocation () method to create the action.

 private void zoomMyCuurentLocation() { LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); Criteria criteria = new Criteria(); if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION); } Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false)); if (location != null) { double lat = location.getLatitude(); double longi = location.getLongitude(); LatLng latLng = new LatLng(lat,longi); mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 14.f)); Log.d(TAG, "zoomMyCuurentLocation: location not null"); } else { setMyLastLocation(); } } private void setMyLastLocation() { Log.d(TAG, "setMyLastLocation: excecute, and get last location"); FusedLocationProviderClient fusedLocationClient = LocationServices.getFusedLocationProviderClient(this); if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { return; } fusedLocationClient.getLastLocation().addOnSuccessListener(this, new OnSuccessListener<Location>() { @Override public void onSuccess(Location location) { if (location != null){ double lat = location.getLatitude(); double longi = location.getLongitude(); LatLng latLng = new LatLng(lat,longi); Log.d(TAG, "MyLastLocation coordinat :"+latLng); mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 14.f)); } } }); }