Wie kann ich den aktuellen GPS-Standort in Android programmatisch abrufen?

Question

Ich muss meinen aktuellen Standort mithilfe von GPS programmatisch ermitteln. Wie kann ich das erreichen?

Answer 1

Einfaches Finden und Schreiben von Code in der Vor-Ort-Methode

public void onLocationChanged(Location location) {
    if (mCurrLocationMarker != null) {
        mCurrLocationMarker.remove();
    }

    //Place current location marker
    LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
    MarkerOptions markerOptions = new MarkerOptions();
    markerOptions.position(latLng);
    markerOptions.title("Current Position");
    markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
    mCurrLocationMarker = mMap.addMarker(markerOptions);

    //move map camera
    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
    mMap.animateCamera(CameraUpdateFactory.zoomTo(18));

    PolylineOptions pOptions = new PolylineOptions()
            .width(5)
            .color(Color.GREEN)
            .geodesic(true);
    for (int z = 0; z < routePoints.size(); z++) {
        LatLng point = routePoints.get(z);
        pOptions.add(point);
    }
    line = mMap.addPolyline(pOptions);
    routePoints.add(latLng);
}

Answer 2

Edit 2022: Verwenden Sie dies nicht, da diese Lib Speicherlecks hat und nicht mehr unterstützt/aktualisiert wird.

Ich empfehle die Verwendung von Intelligente Standortbibliothek
Es ist sehr einfach zu bedienen und verpackt die Logik des Standorts sehr gut.

Zum Starten des Standortdienstes:

SmartLocation.with(context).location()
    .start(new OnLocationUpdatedListener() { ... });

Wenn Sie nur eine einzelne Stelle (nicht periodisch) abfragen wollen, können Sie den Modifikator oneFix verwenden. Beispiel:

SmartLocation.with(context).location()
    .oneFix()
    .start(new OnLocationUpdatedListener() { ... });

Answer 3

Der beste Weg, den Standort zu ermitteln, ist folgender

// put dependancy
 implementation 'com.google.android.gms:play-services-location:11.0.4'

// PUT permissions in Menifest
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 

// create a Java file as below

public class SingleShotLocationProvider {

  public static interface LocationCallback {
      public void onNewLocationAvailable(GPSCoordinates location);
  }

   // calls back to calling thread, note this is for low grain: if you want higher precision, swap the
   // contents of the else and if. Also be sure to check gps permission/settings are allowed.
   // call usually takes <10ms

  public static void requestSingleUpdate(final Context context, final LocationCallback callback) {
    final LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    boolean isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
    if (isNetworkEnabled) {
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_COARSE);
        if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

            return;
        }
        locationManager.requestSingleUpdate(criteria, new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
            }

            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {
            }

            @Override
            public void onProviderEnabled(String provider) {
            }

            @Override
            public void onProviderDisabled(String provider) {
            }
        }, null);
     } else {
        boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        if (isGPSEnabled) {
            Criteria criteria = new Criteria();
            criteria.setAccuracy(Criteria.ACCURACY_FINE);
            locationManager.requestSingleUpdate(criteria, new LocationListener() {
                @Override
                public void onLocationChanged(Location location) {
                    callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
                }

                @Override public void onStatusChanged(String provider, int status, Bundle extras) { }
                @Override public void onProviderEnabled(String provider) { }
                @Override public void onProviderDisabled(String provider) { }
            }, null);
        }
     }
  }

  // consider returning Location instead of this dummy wrapper class
  public static class GPSCoordinates {
     public float longitude = -1;
     public float latitude = -1;

     public GPSCoordinates(float theLatitude, float theLongitude) {
        longitude = theLongitude;
        latitude = theLatitude;
     }

     public GPSCoordinates(double theLatitude, double theLongitude) {
        longitude = (float) theLongitude;
        latitude = (float) theLatitude;
     }
  }

}
// FILE FINISHED

// FETCH LOCATION FROM ACTIVITY AS BELOW
public void getLocation(Context context) {
    MyApplication.log(LOG_TAG, "getLocation() ");

    SingleShotLocationProvider.requestSingleUpdate(context,
            new SingleShotLocationProvider.LocationCallback() {
                @Override
                public void onNewLocationAvailable(SingleShotLocationProvider.GPSCoordinates loc) {
                    location = loc;
                    MyApplication.log(LOG_TAG, "getLocation() LAT: " + location.latitude + ", LON: " + location.longitude);               
                }
            });
}