Getting 0.0 for latitude and longitude while showi

问题:

I am using the following code to get my current location. But the problem I am facing is, it always returns 0.0 for latitude and longitude. I have turned on the GPS settings in the phone and set all the permissions. But still I am facing this.

locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

customLocationListener = new CustomLocationListener();

locationManager.requestLocationUpdates(

        LocationManager.GPS_PROVIDER,

        0,

        0,

        customLocationListener);

class CustomLocationListener implements LocationListener{ ............

      public void onLocationChanged(Location argLocation) { 

         if(location != null) {     

        int latitude=(int)(argLocation.getLatitude()*1E6);   

        int longitude=(int)(argLocation.getLongitude()*1E6);


              }
       } ........ }

Do any one of you know why?

Note : My activity extends MapActivity not Location Listener

回答1:

try this way

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


        Criteria locationCritera = new Criteria();
        String providerName = locationManager.getBestProvider(locationCritera,
                true);
        if(providerName!=null)
            location = locationManager.getLastKnownLocation(providerName);

        locationListener = new MyLocationListener();

        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
                0, locationListener);

in mylocationlistener set your location object

private class MyLocationListener implements LocationListener {

    public void onLocationChanged(Location loc) {

        if (loc != null) {
            location = loc; 

        }
    }

    public void onProviderDisabled(String provider) {

    }

    public void onProviderEnabled(String provider) {
    }

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

回答2:

also check this is one of the reason. Go to maps default application and allow user to allow latitude and longitude option .In our application When the GPS signal blinks and when it stops we will get the latitude and longitude. This Worked for me

---

Edit 1

1. Open Google Maps app and click button on map to get current location.

2. When you allow Google map permission, then only other apps permission will work. (and I feel this is big bug)

3. Now go to your app and try to get current location and it will work.

This is ugly, but we have follow those steps to get current location in our app.

回答3:

Here is what you want..!

public void getCurrentLocation() {
        LocationManager locationManager;
        String context = Context.LOCATION_SERVICE;
        locationManager = (LocationManager) getSystemService(context);
        Criteria crta = new Criteria();
        crta.setAccuracy(Criteria.ACCURACY_FINE);
        crta.setAltitudeRequired(false);
        crta.setBearingRequired(false);
        crta.setCostAllowed(true);
        crta.setPowerRequirement(Criteria.POWER_LOW);
        String provider = locationManager.getBestProvider(crta, true);

        locationManager.requestLocationUpdates(provider, 1000, 0,
                new LocationListener() {
                    @Override
                    public void onStatusChanged(String provider, int status,
                            Bundle extras) {
                    }

                    @Override
                    public void onProviderEnabled(String provider) {
                    }

                    @Override
                    public void onProviderDisabled(String provider) {
                    }

                    @Override
                    public void onLocationChanged(Location location) {
                        if (location != null) {
                            double lat = location.getLatitude();
                            double lng = location.getLongitude();
                            if (lat != 0.0 && lng != 0.0) {
                                System.out.println("WE GOT THE LOCATION");
                                System.out.println(lat);
                                System.out.println(lng);                                                         
                            }
                        }

                    }

                });
    }

回答4:

Here, when we give a permission for location then after just wait for few seconds,GPS will take time for stable location ,after that we will get the actual values of lat and long.

Setting -> GPS Enable

Reason for lat long value comes 0.0

回答5:

CustomLocationManager.Java

import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

public class CustomLocationManager {

    private LocationManager mLocationManager;
    private LocationValue locationValue;
    private Location networkLocation = null;
    private Location gpsLocation = null;

    private Timer mTimer;

    private boolean isGpsEnabled = false;
    private boolean isNetworkEnabled = false;

    private static CustomLocationManager _instance;

    private CustomLocationManager() {}

    public static CustomLocationManager getCustomLocationManager() {
        if (_instance == null) {
            _instance = new CustomLocationManager();
        }
        return _instance;
    }

    public LocationManager getLocationManager(Context context) {
        if (mLocationManager == null)
            mLocationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        return mLocationManager;
    }

    public boolean getCurrentLocation(Context context, LocationValue result) {
        locationValue = result;
        if (mLocationManager == null)
            mLocationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

        try {
            isGpsEnabled = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        } catch (Exception ex) {}

        try {
            isNetworkEnabled = mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        } catch (Exception ex) {}

        if (!isGpsEnabled && !isNetworkEnabled)
            return false;

        if (isGpsEnabled)
            mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, gpsLocationListener);

        if (isNetworkEnabled)
            mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, networkLocationListener);

        mTimer = new Timer();
        mTimer.schedule(new GetLastKnownLocation(), 20000);

        return true;
    }

    LocationListener gpsLocationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            mTimer.cancel();
            locationValue.getCurrentLocation(location);
            mLocationManager.removeUpdates(this);
            mLocationManager.removeUpdates(networkLocationListener);
        }

        public void onProviderDisabled(String provider) {}

        public void onProviderEnabled(String provider) {}

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

    private LocationListener networkLocationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            mTimer.cancel();
            locationValue.getCurrentLocation(location);
            mLocationManager.removeUpdates(this);
            mLocationManager.removeUpdates(gpsLocationListener);
        }

        public void onProviderDisabled(String provider) {}

        public void onProviderEnabled(String provider) {}

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

    private class GetLastKnownLocation extends TimerTask {
        CurrentLocationHandler handler;

        GetLastKnownLocation() {
            handler = new CurrentLocationHandler();
        }

        @Override
        public void run() {
            mLocationManager.removeUpdates(gpsLocationListener);
            mLocationManager.removeUpdates(networkLocationListener);

            if (isGpsEnabled)
                gpsLocation = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

            if (isNetworkEnabled)
                networkLocation = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

            handler.sendEmptyMessage(0);
        }
    }

    private class CurrentLocationHandler extends Handler {
        @Override
        public final void handleMessage(Message msg) {
            if (gpsLocation != null && networkLocation != null) {

                if (gpsLocation.getTime() > networkLocation.getTime())
                    locationValue.getCurrentLocation(gpsLocation);
                else
                    locationValue.getCurrentLocation(networkLocation);

                return;
            }

            if (gpsLocation != null) {
                locationValue.getCurrentLocation(gpsLocation);
                return;
            }

            if (networkLocation != null) {
                locationValue.getCurrentLocation(networkLocation);
                return;
            }

            locationValue.getCurrentLocation(null);
        }
    }
}

LocationValue.Java

import android.location.Location;

public abstract class LocationValue {
    public abstract void getCurrentLocation(Location location);
}

YourActivity.Java

private void getCurrentLocation() {
        CustomLocationManager.getCustomLocationManager().getCurrentLocation(this, locationValue);
    }

    public LocationValue locationValue = new LocationValue() {
        @Override
        public void getCurrentLocation(Location location) {
            // You will get location here if the GPS is enabled
            if(location != null) {
                Log.d("LOCATION", location.getLatitude() + ", " + location.getLongitude());
            }
        }
    };