android - permitir - getlastknownlocation siempre devuelve nulo después de volver a instalar el archivo apk a través de eclipse

origenes desconocidos android 8

Question

Recientemente, creé una aplicación simple para obtener la ubicación gps y mostrarla en el teléfono Android. Al principio puedo obtener la ubicación después de algunos intentos, pero después de volver a instalar el archivo apk, getLastKnownLocation () siempre devuelve un valor nulo.

Entorno de desarrollo utilizado: - API 10 gingerbread 2.3.6 - Se utiliza el proveedor de GPS

a continuación se muestra el código que apliqué en mi proyecto de Android:

 public class MyActivity extends MapActivity{
protected void onCreate(Bundle savedInstanceState) {
mapView = (MapView)findViewById(R.id.myTripMap);
mapController = mapView.getController();
mapView.setSatellite(false);
mapView.setStreetView(true);
mapView.displayZoomControls(false);
mapView.setBuiltInZoomControls(true);//
mapView.setClickable(true);
mapController.setZoom(14);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
provider = locationManager.getBestProvider(criteria, true);
location = locationManager.getLastKnownLocation(provider);
updateMyCurrentLoc(location);
locationManager.requestLocationUpdates(provider, 2, 1,locationListener);
}
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateMyCurrentLoc(location);
}
public void onProviderDisabled(String provider){
updateMyCurrentLoc(null);
}
public void onProviderEnabled(String provider){ }
public void onStatusChanged(String provider, int status,
Bundle extras){ }
};
private void updateMyCurrentLoc(Location location) {
if (location != null) {
// other codes to get the address and display
Toast.makeText(getBaseContext(), "provider used : "+provider).show(); //testing purpose
}
else {
str = "No location found";
Toast.makeText(getBaseContext(), str, Toast.LENGTH_SHORT).show();
}
}
}

¿Alguien puede sugerir una posible solución para resolver el valor nulo devuelto por getLastKnownLocation ()? Cualquier ayuda será apreciada. Gracias.

Answer 1

Esta solución es mi pequeña mejora para el código @Karan Mer.

 public Location getLocation() {
int MIN_TIME_BW_UPDATES = 10000;
int MIN_DISTANCE_CHANGE_FOR_UPDATES = 10000;
try {
locationManager = (LocationManager) getApplicationContext()
.getSystemService(LOCATION_SERVICE);
boolean isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean isPassiveEnabled = locationManager
.isProviderEnabled(LocationManager.PASSIVE_PROVIDER);
boolean isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isGPSEnabled || isNetworkEnabled || isPassiveEnabled) {
this.canGetLocation = true;
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled && location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
}
if (isPassiveEnabled && location == null) {
locationManager.requestLocationUpdates(
LocationManager.PASSIVE_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
}
}
if (isNetworkEnabled && location == null) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
}
}else{
return null;
}
} catch (Exception e) {
e.printStackTrace();
}

Disfrutar

Answer 2

Pruebe seguir el código

LocationManager locationManager = (LocationManager) getActivity()
.getSystemService(Context.LOCATION_SERVICE);
String locationProvider = LocationManager.NETWORK_PROVIDER;
Location lastlocation = locationManager.getLastKnownLocation(locationProvider);
String CurLat = String.valueOf(lastlocation.getLatitude());
String Curlongi= String.valueOf(lastlocation.getLongitude());

Answer 3

Solo necesitas agregar una línea más en el código

if (locationManager != null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
} else {
Toast.makeText(
mContext,
"Location Null", Toast.LENGTH_SHORT).show();
}
}

Answer 4

Tengo el mismo problema después de volver a instalar a través de eclipse. Lo solucioné yendo a la configuración de Android / Seguridad / Permisos de la aplicación y confirmo los permisos de ubicación a la aplicación.

Answer 5

getLastKnownLocation() devuelve la última ubicación conocida ... después de volver a instalar la aplicación no tendrá ninguna última ubicación conocida ... por lo que dará como resultado NPE ... en su lugar use el código siguiente

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;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// 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", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}

Me funcionó ... debería funcionar para usted también ...