Question

我使用以下代码获取当前位置。但我面临的问题是，纬度和经度总是返回0.0。我已打开手机中的GPS设置并设置所有权限。但我仍然面临这一点。

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);


              }
       } ........ }

你们中的任何一个人都知道为什么吗？

注意：我的活动扩展了MapActivity而非Location Listener

Answer 1

也检查这是其中一个原因。转到地图默认应用程序并允许用户允许经度和经度选项。在我们的应用程序中当GPS信号闪烁时，当它停止时我们将获得经度和纬度。这为我工作

编辑1

打开Google地图应用并点击地图上的按钮以获取当前位置。
当您允许使用Google地图权限时，只有其他应用权限才有效。 （我觉得这是个大错误）
现在转到您的应用并尝试获取当前位置，它会起作用。

这很难看，但我们已按照这些步骤在我们的应用中获取当前位置。

Answer 2

试试这种方式

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);

mylocationlistener中的

设置您的位置对象

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) {
    }
}

Answer 3

这是你想要的......！

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);                                                         
                            }
                        }

                    }

                });
    }

Answer 4

在这里，当我们给出位置许可然后等待几秒后，GPS将需要时间来稳定位置，之后我们将获得lat和long的实际值。

设置 - ＆gt; GPS启用

Reason for lat long value comes 0.0

Answer 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);
        }
    }
}

的 LocationValue.Java

import android.location.Location;

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

的 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());
            }
        }
    };

在地图中显示当前位置时获取纬度和经度0.0

5 个答案:

编辑1