studio - kotlin android location




Was ist der einfachste und stabilste Weg, um den aktuellen Standort des Nutzers auf Android zu erhalten? (16)

Die empfohlene Vorgehensweise ist die Verwendung von LocationClient :

Definieren Sie zunächst die Werte für den Standortaktualisierungsintervall. Passen Sie dies Ihren Bedürfnissen an.

private static final int MILLISECONDS_PER_SECOND = 1000;
private static final long UPDATE_INTERVAL = MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;
private static final int FASTEST_INTERVAL_IN_SECONDS = 1;
private static final long FASTEST_INTERVAL = MILLISECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS;

GooglePlayServicesClient.ConnectionCallbacks Sie Ihre Activity GooglePlayServicesClient.ConnectionCallbacks , GooglePlayServicesClient.OnConnectionFailedListener und LocationListener implementieren.

public class LocationActivity extends Activity implements 
GooglePlayServicesClient.ConnectionCallbacks, GooglePlayServicesClient.OnConnectionFailedListener, LocationListener {}

onCreate() dann einen LocationClient in der onCreate() -Methode Ihrer Activity :

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mLocationClient = new LocationClient(this, this, this);

    mLocationRequest = LocationRequest.create();
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    mLocationRequest.setInterval(UPDATE_INTERVAL);
    mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
}

Fügen Sie Ihrer Activity die erforderlichen Methoden hinzu. onConnected() ist die Methode, die aufgerufen wird, wenn der LocationClient Verbindung herstellt. onLocationChanged() Sie den aktuellsten Speicherort ab.

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
    Log.w(TAG, "Location client connection failed");
}

@Override
public void onConnected(Bundle dataBundle) {
    Log.d(TAG, "Location client connected");
    mLocationClient.requestLocationUpdates(mLocationRequest, this); 
}

@Override
public void onDisconnected() {
    Log.d(TAG, "Location client disconnected");
}

@Override
public void onLocationChanged(Location location) {
    if (location != null) {
        Log.d(TAG, "Updated Location: " + Double.toString(location.getLatitude()) + "," + Double.toString(location.getLongitude()));
    } else {
        Log.d(TAG, "Updated location NULL");
    } 
}     

Stellen Sie sicher, dass Sie den LocationClient anschließen / trennen, so dass nur eine zusätzliche Batterie verwendet wird, wenn dies absolut notwendig ist und das GPS nicht unbegrenzt läuft. Der LocationClient muss verbunden sein, um Daten von ihm zu erhalten.

public void onResume() {
    super.onResume();
    mLocationClient.connect();
}

public void onStop() {
    if (mLocationClient.isConnected()) {
        mLocationClient.removeLocationUpdates(this);
    }
    mLocationClient.disconnect();
    super.onStop();
}

Holen Sie sich den Standort des Benutzers. Versuchen Sie zunächst, den LocationClient . Wenn dies fehlschlägt, wechseln Sie zurück zum LocationManager .

public Location getLocation() {
    if (mLocationClient != null && mLocationClient.isConnected()) {
        return mLocationClient.getLastLocation();
    } else {
        LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        if (locationManager != null) {
            Location lastKnownLocationGPS = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            if (lastKnownLocationGPS != null) {
                return lastKnownLocationGPS;
            } else {
                return locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            }
        } else {
            return null;
        }
    }
}

Die LocationManager API auf Android scheint für eine Anwendung, die nur eine gelegentliche und grobe Annäherung an den Standort des Benutzers erfordert, ein wenig mühsam zu sein.

Die App, an der ich arbeite, ist nicht wirklich eine Standort-App für sich, aber sie muss den Standort des Nutzers ermitteln, um eine Liste von Unternehmen in der Nähe anzuzeigen. Es muss sich keine Sorgen machen, wenn sich der Benutzer bewegt oder ähnliches.

Folgendes möchte ich tun:

  1. Zeigen Sie dem Benutzer eine Liste mit Standorten in der Nähe an.
  2. Laden Sie den Standort des Benutzers vorab, so dass er verfügbar ist, wenn er in Activity X benötigt wird.
  3. Die Genauigkeit oder Häufigkeit der Aktualisierung ist mir nicht besonders wichtig. Es genügt, nur einen Standort zu ergattern, solange es nicht weit weg ist. Vielleicht, wenn ich Lust haben will, werde ich den Standort alle paar Minuten aktualisieren, aber das ist keine große Priorität.
  4. Arbeiten Sie für jedes Gerät, solange es einen GPS- oder Netzwerkstandortanbieter hat.

Es scheint, als ob es nicht so schwer sein sollte, aber es scheint mir, dass ich zwei verschiedene Standortanbieter (GPS und NETZWERK) antreiben muss und den Lebenszyklus jedes einzelnen verwalten muss. Nicht nur das, aber ich muss den gleichen Code in mehreren Aktivitäten duplizieren, um # 2 zu befriedigen. Ich habe versucht, getBestProvider() in der Vergangenheit zu verwenden, um die Lösung auf nur einen Standortanbieter herunterzufahren, aber das scheint Ihnen nur den besten "theoretischen" Anbieter und nicht den Anbieter zu geben, der Ihnen tatsächlich die besten Ergebnisse liefert.

Gibt es einen einfacheren Weg, dies zu erreichen?


Dies ist der Code, der den aktuellen Standort des Benutzers angibt

Karten Activity erstellen:

public class Maps extends MapActivity {

    public static final String TAG = "MapActivity";
    private MapView mapView;
    private LocationManager locationManager;
    Geocoder geocoder;
    Location location;
    LocationListener locationListener;
    CountDownTimer locationtimer;
    MapController mapController;
    MapOverlay mapOverlay = new MapOverlay();

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        initComponents();
        mapView.setBuiltInZoomControls(true);
        mapView.setSatellite(true);
        mapView.setTraffic(true);
        mapView.setStreetView(true);
        mapController = mapView.getController();
        mapController.setZoom(16);
        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        if (locationManager == null) {
            Toast.makeText(Maps.this, "Location Manager Not Available",
                Toast.LENGTH_SHORT).show();
            return;
        }
        location = locationManager
                .getLastKnownLocation(LocationManager.GPS_PROVIDER);
        if (location == null)
            location = locationManager
                    .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        if (location != null) {
            double lat = location.getLatitude();
            double lng = location.getLongitude();
            Toast.makeText(Maps.this, "Location Are" + lat + ":" + lng,
                Toast.LENGTH_SHORT).show();
            GeoPoint point = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
            mapController.animateTo(point, new Message());
            mapOverlay.setPointToDraw(point);
            List<Overlay> listOfOverlays = mapView.getOverlays();
            listOfOverlays.clear();
            listOfOverlays.add(mapOverlay);
        }
        locationListener = new LocationListener() {

            public void onStatusChanged(String arg0, int arg1, Bundle arg2) {}

            public void onProviderEnabled(String arg0) {}

            public void onProviderDisabled(String arg0) {}

            public void onLocationChanged(Location l) {
                location = l;
                locationManager.removeUpdates(this);
                if (l.getLatitude() == 0 || l.getLongitude() == 0) {
                } else {
                    double lat = l.getLatitude();
                    double lng = l.getLongitude();
                    Toast.makeText(Maps.this, "Location Are" + lat + ":" + lng,
                        Toast.LENGTH_SHORT).show();
                }
            }
        };
        if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
            locationManager.requestLocationUpdates(
                LocationManager.GPS_PROVIDER, 1000, 10f, locationListener);
        locationManager.requestLocationUpdates(
            LocationManager.NETWORK_PROVIDER, 1000, 10f, locationListener);
        locationtimer = new CountDownTimer(30000, 5000) {

            @Override
            public void onTick(long millisUntilFinished) {
                if (location != null) locationtimer.cancel();
            }

            @Override
            public void onFinish() {
                if (location == null) {
                }
            }
        };
        locationtimer.start();
    }

    public MapView getMapView() {
        return this.mapView;
    }

    private void initComponents() {
        mapView = (MapView) findViewById(R.id.map_container);
        ImageView ivhome = (ImageView) this.findViewById(R.id.imageView_home);
        ivhome.setOnClickListener(new OnClickListener() {

            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(Maps.this, GridViewContainer.class);
                startActivity(intent);
                finish();
            }
        });
    }

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }

    class MapOverlay extends Overlay {

        private GeoPoint pointToDraw;

        public void setPointToDraw(GeoPoint point) {
            pointToDraw = point;
        }

        public GeoPoint getPointToDraw() {
            return pointToDraw;
        }

        @Override
        public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
                long when) {
            super.draw(canvas, mapView, shadow);
            Point screenPts = new Point();
            mapView.getProjection().toPixels(pointToDraw, screenPts);
            Bitmap bmp = BitmapFactory.decodeResource(getResources(),
                R.drawable.select_map);
            canvas.drawBitmap(bmp, screenPts.x, screenPts.y - 24, null);
            return true;
        }
    }
}

main.xml:

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/black"
        android:orientation="vertical" >

        <com.google.android.maps.MapView
            android:id="@+id/map_container"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:apiKey="yor api key"
            android:clickable="true"
            android:focusable="true" />

    </LinearLayout>

and define following permission in manifest:

<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"/>

Folgendes mache ich:

  1. First of all I check whether NETWORK or GPS providers are enabled. Some may be disabled on the device, some may be disabled in application manifest. If any provider is enabled, I fetch cached last location for this provider and start location update listeners for this provider.
  2. There is a method to determine whether a location is better than last received location as mentioned in link :- https://developer.android.com/guide/topics/location/strategies.html#BestEstimate
  3. If I get update from location listener I check whether this location is better than previously received location. and If it is better than replace this location to previous best location( mFinalLocation ).
  4. There is also a handler(timer) for two minutes, which eventually stops the service and in onDestroy() method of service, stop listening for location updates for each of the provider.

Below is the code for service. You can run it based upon frequency of location update you need.

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.annotation.Nullable;
import android.util.Log;


public class RecordLocationService extends Service {

    private final String TAG = RecordLocationService.class.getSimpleName();

    private final int TWO_MINUTES = 1000 * 60 * 2;

    private LocationManager mLocationManager;

    private MyLocationListener mLocationListeners[] = new MyLocationListener[]{
            new MyLocationListener(LocationManager.NETWORK_PROVIDER),
            new MyLocationListener(LocationManager.GPS_PROVIDER)
    };

    private Location mFinalLocation;

    private class MyLocationListener implements LocationListener {
        private String mProvider;

        public MyLocationListener(String provider) {
            Log.d(TAG, "LocationListener : " + provider);
            mProvider = provider;
        }

        public String getProvider() {
            return mProvider;
        }

        @Override
        public void onLocationChanged(Location location) {
            Log.d(TAG, "onLocationChanged : " + location);

            if (isBetterLocation(location, mFinalLocation)) {
                Log.d(TAG, "Setting current Final Location to recent most Location for Provider : " + location.getProvider());
                Log.d(TAG, "Setting current Final Location to : " + location);
                mFinalLocation = location;
            } else {
                Log.d(TAG, "Keeping current Final Location to previous Final Location");
            }

        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            Log.d(TAG, "onStatusChanged provider " + provider);
        }

        @Override
        public void onProviderEnabled(String provider) {
            Log.d(TAG, "onProviderEnabled provider " + provider);
        }

        @Override
        public void onProviderDisabled(String provider) {
            Log.d(TAG, "onProviderDisabled provider " + provider);
        }
    }

    private Handler mStopServiceHandler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1: {
                    stopSelf();
                }
                break;
            }
        }
    };

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        super.onStartCommand(intent, flags, startId);
        Log.d(TAG, "onStartCommand");
        return START_STICKY;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate");
        requestLocation();
        mStopServiceHandler.sendEmptyMessageDelayed(1, TWO_MINUTES);
    }

    private void requestLocation() {
        // Acquire a reference to the system Location Manager
        if (mLocationManager == null) {
            mLocationManager = (LocationManager) this.getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
        }

        try {
            if (mLocationManager.getAllProviders().contains(LocationManager.NETWORK_PROVIDER) && mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
                Log.d(TAG, "Fetching Cached Location for Provider : " + LocationManager.NETWORK_PROVIDER);
                Location cachedNetworkLocation = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                if (cachedNetworkLocation != null) {
                    Log.d(TAG, "Setting Final Location to Cached Location for Provider : " + LocationManager.NETWORK_PROVIDER);
                    Log.d(TAG, "Setting Final Location to : " + cachedNetworkLocation);
                    mFinalLocation = cachedNetworkLocation;
                } else {
                    Log.d(TAG, "Cached Location for Provider : " + LocationManager.NETWORK_PROVIDER + " is NULL");
                }

                Log.d(TAG, "Requesting Location Update for Provider : " + LocationManager.NETWORK_PROVIDER);
                mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationListeners[0]);
            }

        } catch (SecurityException se) {
            Log.e(TAG, se.getMessage(), se);
        } catch (IllegalArgumentException iae) {
            Log.e(TAG, iae.getMessage(), iae);
        }

        try {
            if (mLocationManager.getAllProviders().contains(LocationManager.GPS_PROVIDER) && mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
                Log.d(TAG, "Fetching Cached Location for Provider : " + LocationManager.GPS_PROVIDER);
                Location cachedGPSLocation = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

                if (cachedGPSLocation != null) {
                    if (isBetterLocation(cachedGPSLocation, mFinalLocation)) {
                        Log.d(TAG, "Setting Final Location to Cached Location for Provider : " + LocationManager.GPS_PROVIDER);
                        Log.d(TAG, "Setting Final Location to : " + cachedGPSLocation);
                        mFinalLocation = cachedGPSLocation;
                    }
                } else {
                    Log.d(TAG, "Cached Location for Provider : " + LocationManager.GPS_PROVIDER + " is NULL");
                }

                Log.d(TAG, "Requesting Location Update for Provider : " + LocationManager.GPS_PROVIDER);
                mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mLocationListeners[1]);
            }

        } catch (SecurityException se) {
            Log.e(TAG, se.getMessage(), se);
        } catch (IllegalArgumentException iae) {
            Log.e(TAG, iae.getMessage(), iae);
        }


    }

    /**
     * Determines whether one Location reading is better than the current Location fix
     *
     * @param location            The new Location that you want to evaluate
     * @param currentBestLocation The current Location fix, to which you want to compare the new one
     */
    protected boolean isBetterLocation(Location location, Location currentBestLocation) {
        if (currentBestLocation == null) {
            // A new location is always better than no location
            return true;
        }

        // Check whether the new location fix is newer or older
        long timeDelta = location.getTime() - currentBestLocation.getTime();
        boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
        boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
        boolean isNewer = timeDelta > 0;

        // If it's been more than two minutes since the current location, use the new location
        // because the user has likely moved
        if (isSignificantlyNewer) {
            return true;
            // If the new location is more than two minutes older, it must be worse
        } else if (isSignificantlyOlder) {
            return false;
        }

        // Check whether the new location fix is more or less accurate
        int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
        boolean isLessAccurate = accuracyDelta > 0;
        boolean isMoreAccurate = accuracyDelta < 0;
        boolean isSignificantlyLessAccurate = accuracyDelta > 200;

        // Check if the old and new location are from the same provider
        boolean isFromSameProvider = isSameProvider(location.getProvider(),
                currentBestLocation.getProvider());

        // Determine location quality using a combination of timeliness and accuracy
        if (isMoreAccurate) {
            return true;
        } else if (isNewer && !isLessAccurate) {
            return true;
        } else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
            return true;
        }
        return false;
    }

    /**
     * Checks whether two providers are the same
     */
    private boolean isSameProvider(String provider1, String provider2) {
        if (provider1 == null) {
            return provider2 == null;
        }
        return provider1.equals(provider2);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy");
        if (mLocationManager != null) {
            for (int i = 0; i < mLocationListeners.length; i++) {
                try {
                    Log.d(TAG, "Removing Location Update for Provider : " + mLocationListeners[i].getProvider());
                    mLocationManager.removeUpdates(mLocationListeners[i]);
                } catch (Exception ex) {
                    Log.e(TAG, "fail to remove location listeners, ignore", ex);
                }
            }
        }
    }
}

Genau genommen können wir beide Anbieter nutzen. Und sie teilen nur einen öffentlichen Zuhörer:

locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 10 * 1000, (float) 10.0, listener);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 90 * 1000, (float) 10.0, listener);

Dies ist notwendig, da die OnLocationChanged () -Methode immer rechtzeitig aufgerufen werden muss.


Ich habe detaillierte Tutorial über den aktuellen Standort hier auf demonuts.com geschrieben. Sie können hier mehr Beschreibung finden und Sie können auch ganzen Demo-Quellcode zum besseren Verständnis herunterladen.

Es gibt bereits viele Antworten dort, aber ich möchte die neueste Möglichkeit zeigen, den Standort mithilfe von Google API zu erhalten, damit neue Programmierer neue Methoden verwenden können:

Zuallererst, legen Sie dies in Gradle-Datei

compile 'com.google.android.gms:play-services:8.4.0'

Implementiere dann notwendige Schnittstellen

public class MainActivity  extends BaseActivitiy implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener

Instanzen deklarieren

  private GoogleApiClient mGoogleApiClient;
  private Location mLocation;
  private LocationManager locationManager;
  private LocationRequest mLocationRequest;

setze dies in onCreate()

 mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

Überschreiben Sie schließlich die notwendigen Methoden

 @Override
    public void onConnected(Bundle bundle) {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        mLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if(mLocation == null){
            startLocationUpdates();
        }
        if (mLocation != null) {
            double latitude = mLocation.getLatitude();
            double longitude = mLocation.getLongitude();
        } else {
            // Toast.makeText(this, "Location not Detected", Toast.LENGTH_SHORT).show();
        }
    }

    protected void startLocationUpdates() {
        // Create the location request
        mLocationRequest = LocationRequest.create()
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                .setInterval(UPDATE_INTERVAL)
                .setFastestInterval(FASTEST_INTERVAL);
        // Request location updates
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
                mLocationRequest, this);
        Log.d("reque", "--->>>>");
    }

    @Override
    public void onConnectionSuspended(int i) {
        Log.i(TAG, "Connection Suspended");
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.i(TAG, "Connection failed. Error: " + connectionResult.getErrorCode());
    }

    @Override
    public void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }
    @Override
    public void onLocationChanged(Location location) {

    }

Vergessen Sie nicht, GPS auf Ihrem Gerät zu starten, bevor Sie die App starten.


Ich habe eine kleine Anwendung mit Schritt für Schritt Beschreibung erstellt, um aktuelle GPS-Koordinaten zu erhalten.

Füllen Sie den Beispiel-Quellcode in der folgenden URL aus:

Erhalten Sie aktuelle Standortkoordinaten, Name der Stadt - in Android

Sehen, wie es funktioniert :

  • Alles, was wir tun müssen, ist diese Berechtigung in der Manifestdatei hinzuzufügen

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION">  
    </uses-permission>
    
  • und erstellen Sie eine LocationManager-Instanz wie diese

    LocationManager locationManager = (LocationManager) 
                                      getSystemService(Context.LOCATION_SERVICE);
    
  • Überprüfen Sie, ob GPS aktiviert ist oder nicht

  • Implementieren Sie dann LocationListener und Get Coordinates

    LocationListener locationListener = new MyLocationListener();  
    locationManager.requestLocationUpdates(  
    LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
    
  • Hier ist der Beispielcode zu tun

/*----------Listener class to get coordinates ------------- */
private class MyLocationListener implements LocationListener {

    @Override
    public void onLocationChanged(Location loc) {
        editLocation.setText("");
        pb.setVisibility(View.INVISIBLE);
        Toast.makeText(
            getBaseContext(),
            "Location changed: Lat: " + loc.getLatitude() + " Lng: "
                + loc.getLongitude(), Toast.LENGTH_SHORT).show();
        String longitude = "Longitude: " + loc.getLongitude();
        Log.v(TAG, longitude);
        String latitude = "Latitude: " + loc.getLatitude();
        Log.v(TAG, latitude);
        /*-------to get City-Name from coordinates -------- */
        String cityName = null;
        Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
        List<Address> addresses;
        try {
            addresses = gcd.getFromLocation(loc.getLatitude(),
                loc.getLongitude(), 1);
            if (addresses.size() > 0)
                System.out.println(addresses.get(0).getLocality());
            cityName = addresses.get(0).getLocality();
        } catch (IOException e) {
            e.printStackTrace();
        }
        String s = longitude + "\n" + latitude + "\n\nMy Current City is: "
            + cityName;
        editLocation.setText(s);
    }

    @Override
    public void onProviderDisabled(String provider) {}

    @Override
    public void onProviderEnabled(String provider) {}

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

Nach der Suche nach der besten Implementierung, wie ich die bestmögliche Benutzerpositionierung erreichen kann, habe ich es geschafft, die besten Methoden zu kombinieren und folgende Klasse zu entwickeln:

/**
 * Retrieve accurate location from GPS or network services. 
 * 
 *
 * Class usage example:
 * 
 * public void onCreate(Bundle savedInstanceState) {
 *      ...
 *      my_location = new MyLocation();
 *      my_location.init(main.this, locationResult);
 * }
 * 
 * 
 * public LocationResult locationResult = new LocationResult(){
 *      @Override
 *      public void gotLocation(final Location location){
 *          // do something
 *          location.getLongitude();
 *          location.getLatitude();
 *      }
 *  };
 */
class MyLocation{

    /**
     * If GPS is enabled. 
     * Use minimal connected satellites count.
     */
    private static final int min_gps_sat_count = 5;

    /**
     * Iteration step time.
     */
    private static final int iteration_timeout_step = 500;

    LocationResult locationResult;
    private Location bestLocation = null;
    private Handler handler = new Handler();
    private LocationManager myLocationManager; 
    public Context context;

    private boolean gps_enabled = false;

    private int counts    = 0;
    private int sat_count = 0;

    private Runnable showTime = new Runnable() {

         public void run() {
            boolean stop = false;
            counts++;
            System.println("counts=" + counts);

            //if timeout (1 min) exceeded, stop tying
            if(counts > 120){
                stop = true;
            }

            //update last best location
            bestLocation = getLocation(context);

            //if location is not ready or don`t exists, try again
            if(bestLocation == null && gps_enabled){
                System.println("BestLocation not ready, continue to wait");
                handler.postDelayed(this, iteration_timeout_step);
            }else{
                //if best location is known, calculate if we need to continue to look for better location
                //if gps is enabled and min satellites count has not been connected or min check count is smaller then 4 (2 sec)  
                if(stop == false && !needToStop()){
                    System.println("Connected " + sat_count + " sattelites. continue waiting..");
                    handler.postDelayed(this, iteration_timeout_step);
                }else{
                    System.println("#########################################");
                    System.println("BestLocation finded return result to main. sat_count=" + sat_count);
                    System.println("#########################################");

                    // removing all updates and listeners
                    myLocationManager.removeUpdates(gpsLocationListener);
                    myLocationManager.removeUpdates(networkLocationListener);    
                    myLocationManager.removeGpsStatusListener(gpsStatusListener);
                    sat_count = 0;

                    // send best location to locationResult
                    locationResult.gotLocation(bestLocation);
                }
            }
         }
    };

    /**
     * Determine if continue to try to find best location
     */
    private Boolean needToStop(){

        if(!gps_enabled){
                          return true;
                     }
          else if(counts <= 4){
                return false;
            }
            if(sat_count < min_gps_sat_count){
                //if 20-25 sec and 3 satellites found then stop
                if(counts >= 40 && sat_count >= 3){
                    return true;
                }
                return false;
            }
        }
        return true;
    }

    /**
     * Best location abstract result class
     */
    public static abstract class LocationResult{
         public abstract void gotLocation(Location location);
     }

    /**
     * Initialize starting values and starting best location listeners
     * 
     * @param Context ctx
     * @param LocationResult result
     */
    public void init(Context ctx, LocationResult result){
        context = ctx;
        locationResult = result;

        myLocationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

        gps_enabled = (Boolean) myLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

        bestLocation = null;
        counts = 0;

        // turning on location updates
        myLocationManager.requestLocationUpdates("network", 0, 0, networkLocationListener);
        myLocationManager.requestLocationUpdates("gps", 0, 0, gpsLocationListener);
        myLocationManager.addGpsStatusListener(gpsStatusListener);

        // starting best location finder loop
        handler.postDelayed(showTime, iteration_timeout_step);
    }

    /**
     * GpsStatus listener. OnChainged counts connected satellites count.
     */
    public final GpsStatus.Listener gpsStatusListener = new GpsStatus.Listener() {
        public void onGpsStatusChanged(int event) {

             if(event == GpsStatus.GPS_EVENT_SATELLITE_STATUS){
                try {
                    // Check number of satellites in list to determine fix state
                     GpsStatus status = myLocationManager.getGpsStatus(null);
                     Iterable<GpsSatellite>satellites = status.getSatellites();

                     sat_count = 0;

                     Iterator<GpsSatellite>satI = satellites.iterator();
                     while(satI.hasNext()) {
                         GpsSatellite satellite = satI.next();
                         System.println("Satellite: snr=" + satellite.getSnr() + ", elevation=" + satellite.getElevation());                         
                         sat_count++;
                     }
                } catch (Exception e) {
                    e.printStackTrace();
                    sat_count = min_gps_sat_count + 1;
                }

                 System.println("#### sat_count = " + sat_count);
             }
         }
    };

    /**
     * Gps location listener.
     */
    public final LocationListener gpsLocationListener = new LocationListener(){
        @Override
         public void onLocationChanged(Location location){

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

    /**
     * Network location listener.
     */
    public final LocationListener networkLocationListener = new LocationListener(){
        @Override
         public void onLocationChanged(Location location){

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


    /**
     * Returns best location using LocationManager.getBestProvider()
     * 
     * @param context
     * @return Location|null
     */
    public static Location getLocation(Context context){
        System.println("getLocation()");

        // fetch last known location and update it
        try {
            LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

            Criteria criteria = new Criteria();
            criteria.setAccuracy(Criteria.ACCURACY_FINE);
             criteria.setAltitudeRequired(false);
             criteria.setBearingRequired(false);
             criteria.setCostAllowed(true);
             String strLocationProvider = lm.getBestProvider(criteria, true);

             System.println("strLocationProvider=" + strLocationProvider);
             Location location = lm.getLastKnownLocation(strLocationProvider);
             if(location != null){
                return location;
             }
             return null;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

Diese Klasse versucht, eine Verbindung zu min_gps_sat_count Satelliten min_gps_sat_count , wenn GPS aktiviert ist. Else gibt LocationManager.getBestProvider() . Überprüfen Sie den Code!


Sie könnten immer nur LocationManager.getLastKnownLocation() aber wie es heißt, es könnte veraltet sein.

Und eine einfache Möglichkeit, einen allgemeinen Standort zu erhalten, könnte sich für das Netzwerk registrieren (normalerweise ziemlich schnell).

LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(
     LocationManager.NETWORK_PROVIDER, 1000, 1000, this);

und dann machen

locationManager.removeUpdates(this);

in der onLocationChanged() Methode des Listeners.


EDIT: Updated with the latest Location Service API from Google Play Services library (July 2014)

I would recommend you to use the new Location Service API , available from the Google Play Services library, which provides a more powerful, high-level framework that automates tasks such as location provider choice and power management. According to the official documentation: "... Location API make it easy for you to build location-aware applications, without needing to focus on the details of the underlying location technology. They also let you minimize power consumption by using all of the capabilities of the device hardware."

For further information visit: Making Your App Location-Aware

To see a full example using the latest Location Service API visit: Android LocationClient class is deprecated but used in documentation


Simple and best way for GeoLocation.

LocationManager lm = null;
boolean network_enabled;


if (lm == null)
                lm = (LocationManager) Kikit.this.getSystemService(Context.LOCATION_SERVICE);

            network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            dialog = ProgressDialog.show(Kikit.this, "", "Fetching location...", true);


            final Handler handler = new Handler();
            timer = new Timer();
            TimerTask doAsynchronousTask = new TimerTask() {

                @Override
                public void run() {
                    handler.post(new Runnable() {

                        @Override
                        public void run() 
                        {

                            Log.e("counter value","value "+counter);

                            if(counter<=8)
                            {
                                try 
                                {
                                    counter++;


                                    if (network_enabled) {

                                        lm = (LocationManager) Kikit.this.getSystemService(Context.LOCATION_SERVICE);

                                        Log.e("in network_enabled..","in network_enabled");

                                        // Define a listener that responds to location updates
                                        LocationListener locationListener = new LocationListener() 
                                        {


                                            public void onLocationChanged(Location location) 
                                            {
                                                if(attempt == false)

                                                {
                                                    attempt = true;
                                                    Log.e("in location listener..","in location listener..");
                                                    longi = location.getLongitude();
                                                    lati = location.getLatitude();
                                                    Data.longi = "" + longi; 
                                                    Data.lati = "" + lati;


                                                    Log.e("longitude : ",""+longi);
                                                    Log.e("latitude : ",""+lati);



                                                    if(faceboo_name.equals(""))
                                                    {
                                                        if(dialog!=null){
                                                        dialog.cancel();}
                                                        timer.cancel();
                                                        timer.purge();
                                                        Data.homepage_resume = true;
                                                        lm = null;
                                                        Intent intent = new Intent();                              
                                                        intent.setClass(Kikit.this,MainActivity.class);

                                                        startActivity(intent);      
                                                        finish();
                                                    }
                                                    else
                                                    {           

                                                        isInternetPresent = cd.isConnectingToInternet();

                                                        if (isInternetPresent) 
                                                        {
                                                            if(dialog!=null)
                                                                dialog.cancel();

                                                            Showdata();
                                                        }
                                                        else
                                                        {
                                                            error_view.setText(Data.internet_error_msg);
                                                            error_view.setVisibility(0);
                                                            error_gone();
                                                        }

                                                    }   
                                                }

                                            }

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

                                            public void onProviderEnabled(String provider) {
                                                //Toast.makeText(getApplicationContext(), "Location enabled", Toast.LENGTH_LONG).show();

                                            }

                                            public void onProviderDisabled(String provider) {


                                            }
                                        };



                                        // Register the listener with the Location Manager to receive
                                        // location updates
                                        lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 100000, 10,locationListener);

                                    } else{
                                        //Toast.makeText(getApplicationContext(), "No Internet Connection.", 2000).show();
                                        buildAlertMessageNoGps();

                                    }



                                } catch (Exception e) {
                                    // TODO
                                    // Auto-generated
                                    // catch
                                    // block
                                }
                            }
                            else
                            {

                                timer.purge();
                                timer.cancel();

                                if(attempt == false)
                                {
                                    attempt = true;

                                    String locationProvider = LocationManager.NETWORK_PROVIDER;
                                    // Or use LocationManager.GPS_PROVIDER

                                    try {
                                        Location lastKnownLocation = lm.getLastKnownLocation(locationProvider);

                                        longi = lastKnownLocation.getLongitude();
                                        lati = lastKnownLocation.getLatitude();
                                        Data.longi = "" + longi; 
                                        Data.lati = "" + lati;
                                    } catch (Exception e) {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                        Log.i("exception in loc fetch", e.toString());
                                    }

                                    Log.e("longitude of last known location : ",""+longi);
                                    Log.e("latitude of last known location : ",""+lati);

                                    if(Data.fb_access_token == "")
                                    {

                                        if(dialog!=null){
                                            dialog.cancel();}
                                        timer.cancel();
                                        timer.purge();
                                        Data.homepage_resume = true;
                                        Intent intent = new Intent();                              
                                        intent.setClass(Kikit.this,MainActivity.class);

                                        startActivity(intent);  
                                        finish();
                                    }
                                    else
                                    {           

                                        isInternetPresent = cd.isConnectingToInternet();

                                        if (isInternetPresent) 
                                        {
                                            if(dialog!=null){
                                                dialog.cancel();}           
                                            Showdata();
                                        }
                                        else
                                        {
                                            error_view.setText(Data.internet_error_msg);
                                            error_view.setVisibility(0);
                                            error_gone();
                                        }

                                    }   

                                }
                            }
                        }
                    });
                }
            };
            timer.schedule(doAsynchronousTask, 0, 2000);


private void buildAlertMessageNoGps() {
        final AlertDialog.Builder builder = new AlertDialog.Builder(this);

        builder.setMessage("Your WiFi & mobile network location is disabled , do you want to enable it?")
        .setCancelable(false)
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {


            public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) 
            {
                startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
                setting_page = true;
            }
        })
        .setNegativeButton("No", new DialogInterface.OnClickListener() {
            public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
                dialog.cancel();
                finish();
            }
        });
        final AlertDialog alert = builder.create();
        alert.show();
    }

Before I answer, I just want to be upfront about the fact that I'm affiliated with Neura. Now to your question. So, instead of wasting your time behind coding to get your user's location, you can use our SDK. It takes less than 30 mins to integrate. Neura provides you with your user's location/activity,and you can configure your application accordingly to perform certain tasks after you receive the data. Here's a few reasons to use Neura over other Activity recognition API's:

  1. No need to code tons of lines to understand your user.
  2. Gives you accurate results.
  3. Consumes less than 1% of your battery.

By using FusedLocationProviderApi which is the latest API and the best among the available possibilities to get location in Android. add this in build.gradle file

dependencies {
    compile 'com.google.android.gms:play-services:6.5.87'
}

you can get full source code by this url http://javapapers.com/android/android-location-fused-provider/


It requires lots of things in place to get location updates in android, requires lots of bolierplate code.

You need to take care of

  • Google Play services availablity Check,
  • Update Google play Service if it is old or not available
  • Dialog Creation of GoogleApiClient and its callbacks connected,disconnected etc.
  • Stopping and releasing resources for location updates
  • Handling Location permission scenarios
  • Checking Location services are On or Off
  • Getting lastknown location is not so easy either
  • Fallback to last known location if not getting location after certain duration

I have created Android-EasyLocation (small android library) which will take care all this stuff and you can focus on business logic.

All you need is extend EasyLocationActivity and this

requestSingleLocationFix(easyLocationRequest);

oder

requestLocationUpdates(easyLocationRequest);

Checkout sample app and steps needed here at https://github.com/akhgupta/Android-EasyLocation


Recently refactored to obtain the location of the code, learn some good ideas, and finally achieved a relatively perfect library and Demo.

//request all valid provider(network/gps)
private boolean requestAllProviderUpdates() {
    checkRuntimeEnvironment();
    checkPermission();

    if (isRequesting) {
        EasyLog.d("Request location update is busy");
        return false;
    }


    long minTime = getCheckTimeInterval();
    float minDistance = getCheckMinDistance();

    if (mMapLocationListeners == null) {
        mMapLocationListeners = new HashMap<>();
    }

    mValidProviders = getValidProviders();
    if (mValidProviders == null || mValidProviders.isEmpty()) {
        throw new IllegalArgumentException("Not available provider.");
    }

    for (String provider : mValidProviders) {
        LocationListener locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                if (location == null) {
                    EasyLog.e("LocationListener callback location is null.");
                    return;
                }
                printf(location);
                mLastProviderTimestamp = location.getTime();

                if (location.getProvider().equals(LocationManager.GPS_PROVIDER)) {
                    finishResult(location);
                } else {
                    doLocationResult(location);
                }

                removeProvider(location.getProvider());
                if (isEmptyValidProviders()) {
                    requestTimeoutMsgInit();
                    removeUpdates();
                }
            }

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

            @Override
            public void onProviderEnabled(String provider) {
            }

            @Override
            public void onProviderDisabled(String provider) {
            }
        };
        getLocationManager().requestLocationUpdates(provider, minTime, minDistance, locationListener);
        mMapLocationListeners.put(provider, locationListener);
        EasyLog.d("Location request %s provider update.", provider);
    }
    isRequesting = true;
    return true;
}

//remove request update
public void removeUpdates() {
    checkRuntimeEnvironment();

    LocationManager locationManager = getLocationManager();
    if (mMapLocationListeners != null) {
        Set<String> keys = mMapLocationListeners.keySet();
        for (String key : keys) {
            LocationListener locationListener = mMapLocationListeners.get(key);
            if (locationListener != null) {
                locationManager.removeUpdates(locationListener);
                EasyLog.d("Remove location update, provider is " + key);
            }
        }
        mMapLocationListeners.clear();
        isRequesting = false;
    }
}

//Compared with the last successful position, to determine whether you need to filter
private boolean isNeedFilter(Location location) {
    checkLocation(location);

    if (mLastLocation != null) {
        float distance = location.distanceTo(mLastLocation);
        if (distance < getCheckMinDistance()) {
            return true;
        }
        if (location.getAccuracy() >= mLastLocation.getAccuracy()
                && distance < location.getAccuracy()) {
            return true;
        }
        if (location.getTime() <= mLastProviderTimestamp) {
            return true;
        }
    }
    return false;
}

private void doLocationResult(Location location) {
    checkLocation(location);

    if (isNeedFilter(location)) {
        EasyLog.d("location need to filtered out, timestamp is " + location.getTime());
        finishResult(mLastLocation);
    } else {
        finishResult(location);
    }
}

//Return to the finished position
private void finishResult(Location location) {
    checkLocation(location);

    double latitude = location.getLatitude();
    double longitude = location.getLongitude();
    float accuracy = location.getAccuracy();
    long time = location.getTime();
    String provider = location.getProvider();

    if (mLocationResultListeners != null && !mLocationResultListeners.isEmpty()) {
        String format = "Location result:<%f, %f> Accuracy:%f Time:%d Provider:%s";
        EasyLog.i(String.format(format, latitude, longitude, accuracy, time, provider));

        mLastLocation = location;
        synchronized (this) {
            Iterator<LocationResultListener> iterator =  mLocationResultListeners.iterator();
            while (iterator.hasNext()) {
                LocationResultListener listener = iterator.next();
                if (listener != null) {
                    listener.onResult(location);
                }
                iterator.remove();
            }
        }
    }
}

Complete code: https://github.com/bingerz/FastLocation/blob/master/fastlocationlib/src/main/java/cn/bingerz/fastlocation/FastLocation.java

*Each request to complete the location, it is best to removeUpdates, otherwise the phone status bar will always display the positioning icon.


To get and show the user's current location, you could also use MyLocationOverlay . Suppose you have a mapView field in your activity. All you would need to do to show the user location is the following:

myLocationOverlay = new MyLocationOverlay(this, mapView);
myLocationOverlay.enableMyLocation();
mapView.getOverlays().add(myLocationOverlay);

This gets the current location from either the GPS or the network. If both fail, enableMyLocation() will return false .

As for the locations of things around the area, an ItemizedOverlay should do the trick.

I hope I haven't misunderstood your question. Good luck.


public static Location getBestLocation(Context ctxt) {
    Location gpslocation = getLocationByProvider(
        LocationManager.GPS_PROVIDER, ctxt);
    Location networkLocation = getLocationByProvider(
        LocationManager.NETWORK_PROVIDER, ctxt);
    Location fetchedlocation = null;
    // if we have only one location available, the choice is easy
    if (gpslocation != null) {
        Log.i("New Location Receiver", "GPS Location available.");
        fetchedlocation = gpslocation;
    } else {
        Log.i("New Location Receiver",
            "No GPS Location available. Fetching Network location lat="
                + networkLocation.getLatitude() + " lon ="
                + networkLocation.getLongitude());
        fetchedlocation = networkLocation;
    }
    return fetchedlocation;
}

/**
 * get the last known location from a specific provider (network/gps)
 */
private static Location getLocationByProvider(String provider, Context ctxt) {
    Location location = null;
    // if (!isProviderSupported(provider)) {
    // return null;
    // }
    LocationManager locationManager = (LocationManager) ctxt
            .getSystemService(Context.LOCATION_SERVICE);
    try {
        if (locationManager.isProviderEnabled(provider)) {
            location = locationManager.getLastKnownLocation(provider);
        }
    } catch (IllegalArgumentException e) {
        Log.i("New Location Receiver", "Cannot access Provider " + provider);
    }
    return location;
}




latitude-longitude